oil capacity DODGE RAM 1999 Service Repair Manual
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Page 12 of 1691
A/C C O M PR ESSO R R EFR IG ER AN T O IL C HEC KIN G
1999 D odge P ic ku p R 1500
1999 GENERAL SERVICING
A/C Compressor Refrigerant Oil Checking
All Models
* PLEASE READ THIS FIRST *
NOTE: For compressor applications, see COMPRESSOR APPLICATIONS &
BODY DESIGNATIONS. DO NOT exceed A/C system refrigerant oil
capacity when servicing system. See CAPACITIES.
BODY DESIGNATIONS
BODY DESIGNATIONS (CHRYSLER CORP. CARS) \
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Model ( 1) Body Designation
Avenger & Sebring Coupe ................................ "FJ22" Body
Breeze, Cirrus & Stratus ................................. "JA" Body
Concorde, Intrepid, LHS & 300M ........................... "LH" Body
Neon ..................................................... "PL" Body
Sebring Convertible ...................................... "JX" Body
( 1) - Body codes are determined by fifth character of VIN code.
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BODY DESIGNATIONS (CHRYSLER CORP. LIGHT TRUCKS & VANS) \
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Model Body Designation
Caravan, Town & Country, & Voyager ..................... "NS" Series
Dakota ................................................. "AN" Series
Durango ................................................ "DN" Series
Ram Pickup .......................................... "BR/BE" Series
Ram Van/Wagon .......................................... "AB" Series
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BODY DESIGNATIONS (FORD MOTOR CO. LIGHT TRUCKS & VANS) \
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Model Body Designation
Explorer & Mountaineer .................................. "U" Series
Pickup .................................................. "F" Series
Ranger .................................................. "R" Series
Van ..................................................... "E" Series
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BODY DESIGNATIONS (GENERAL MOTORS CARS) \
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Model ( 1) Body Designation
Alero, Cutlass, Grand Am & Malibu ......................... "N" Body
Aurora & Riviera .......................................... "G" Body
Bonneville, Eighty Eight, LeSabre & LSS ................... "H" Body
Camaro & Firebird ......................................... "F" Body
Catera .................................................... "V" Body
Cavalier & Sunfire ........................................ "J" Body
Century, Grand Prix, Intrigue, Lumina, Monte Carlo &
Regal .................................................... "W" Body
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system. If A/C specification label and specifications in this
article differ, use underhood label specifications.
REFRIGERANT OIL & R-134a REFRIGERANT CAPACITY (CARS)
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Application ( 1) Oil Oz. Refrigerant Oz.
Chrysler Corp.
Avenger & Sebring Coupe
2.0L (DOHC) ...................... 2.7-4.1 ......... 24.7-26.1\
2.5L (SOHC) ...................... 5.7-6.4 ......... 24.7-26.1\
Breeze, Cirrus & Stratus ............. 5.0 ................ 20.0
Concorde, Intrepid, LHS & 300M ....... 5.0 ................ 28.0
Neon ................................. 6.8 ................ 28.0
Sebring Convertible .................. 5.0 ................ 20.0
Ford Motor Co.
Continental .......................... 7.0 ................ 34.0
Contour, Cougar & Mystique ........... ( 1) ................. ( 1)
Crown Victoria & Grand Marquis ....... 7.0 ................ 38.0
Escort, Coupe & Tracer ............... 7.0 ................ 28.0
Mustang .............................. 7.0 ................ 34.0
Sable & Taurus ....................... 7.0 ................ 34.0
Town Car ............................. 7.0 ................ 38.0
General Motors
"C" Body ............................. 9.0 ................ 32.0
"E" & "K" Bodies ................ ( 1) 8.0-9.0 ............. 32.0
"F" Body ............................. 9.0 ................ 24.0
"G" Body
With HD6/HT6 Compressor ............ 8.0 ................ 32.0
With V5 Compressor ................. 9.0 ................ 32.0
"H" Body ............................. 9.0 ................ 32.0
"J" Body ............................. 9.0 ................ 24.0
"M" Body ............................. 3.4 ........... 19.0-21.0
"N" Body ............................. 9.0 ................. ( 2)
"S" Body ......................... ( 3) 4.1 ........... 22.9-26.5
"V" Body ............................. 9.0 ................ 33.5
"W" Body ............................. 9.0 ................ 30.0
"Y" Body ............................. 9.0 ................ 24.0
"Z" Body ............................. 5.0 ................ 24.0
( 1) - Total system capacity, unless otherwise noted. Refer to
underhood A/C specification label in engine compartment for
specified oil type.
( 2) - Refrigerant capacity for Alero and Grand Am is 36.0 ounces.
Refrigerant capacity for Cutlass and Malibu is 28.0 ounces.
( 3) - Compressor oil capacity.
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REFRIGERANT OIL & R-134a REFRIGERANT CAPACITY (LIGHT TRUCKS & VANS) \
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Application ( 1) Oil Oz. Refrigerant Oz.
Chrysler Corp.
Caravan, Town & Country, & Voyager
Without Rear Unit ................... 9.0 ............... 34.0
With Rear Unit ..................... 13.4 ............... 44.0
Dakota ................................ 8.1 ............... 28.0
Durango
Without Rear Unit ................... 5.5 ............... 28.0
With Rear Unit ...................... 8.0 ............... 30.0
Ram Pickup ............................ 8.1 ............... 30.0
Ram Van/Wagon
Without Rear Unit ................... 8.0 ............... 34.0
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With Rear Unit ..................... 10.0 ............... 46.0
Ford Motor Co.
"E" Series
With Rear Unit ..................... 13.0 ............... 64.0
Without Rear Unit ................... 9.0 ............... 44.0
Expedition & Navigator ................ (2) ................ ( 2)
Explorer & Mountaineer ................ 7.0 ............... 30.0
F150/F250 Pickup ...................... 9.0 ............... 32.0
F250HD/F350 Pickup .................... 9.0 ............... 32.0
Ranger ................................ 7.0 ............... 30.0
Villager
With Rear Unit ..................... 11.0 ............... 56.0
Without Rear Unit ................... 7.0 ............... 32.0
Windstar
With Rear Unit ..................... 13.0 ............... 56.0
Without Rear Unit ................... 9.0 ............... 44.0
General Motors
"C" & "K" Series
Pickup & Sierra ..................... 8.0 ............... 32.0
Crew Cab & Utility .................. 8.0 ............... 36.0
Suburban, Tahoe & Yukon
With Rear Unit ..................... 11.0 ............... 64.0
Without Rear Unit ................... 8.0 ............... 36.0
"G" Series
With Rear Unit ..................... 11.0 ............... 78.0
Without Rear Unit ................... 8.0 ............... 48.0
"J" Series ............................ 3.4 ............... 21.0
"L" & "M" Series
With Rear Unit ..................... 11.0 ............... 48.0
Without Rear Unit ................... 8.0 ............... 32.0
"P" Series ............................ 8.0 ................ ( 2)
"S" & "T" Series
2.2L ................................ 9.0 .......... 30.0-32.0
4.3L ................................ 8.0 .......... 30.0-32.0
"U" Series
With Rear Unit ..................... 11.0 ............... 46.0
Without Rear Unit ................... 8.0 ............... 32.0
Jeep
Cherokee .............................. 8.1 ............... 20.0
Grand Cherokee ........................ 5.8 ............... 24.0
Wrangler .............................. 8.1 ............... 20.0
( 1) - Total system capacity, unless otherwise noted. Refer to
underhood A/C specification label in engine compartment for
specified oil type.
( 2) - Refrigerant oil and/or refrigerant capacity not available from
manufacturer. Refer to underhood A/C specification label in
engine compartment.
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REFRIGERANT OILS
* PLEASE READ THIS FIRST *
NOTE: Use ONLY the specified oil for the A/C system or compressor.
Always check the underhood A/C specification label or A/C
compressor label before adding refrigerant oil to A/C
compressor/system.
NOTE: For compressor applications, see COMPRESSOR APPLICATIONS &
BODY DESIGNATIONS. DO NOT exceed A/C system refrigerant oil
capacity when servicing system. See CAPACITIES.
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Evaporator
Except "U" Series .......................................... 3.0
"U" Series ................................................. (4)
( 1) - Add amount drained from old accumulator/receiver-drier plus one
ounce.
( 2) - Ensure replacement compressor contains the same amount of
refrigerant oil as was drained from old compressor.
( 3) - Drain and measure refrigerant oil from old compressor. If old
compressor had less than one ounce, add 2 ounces of refrigerant
oil to replacement compressor. If old compressor had more than
one ounce, add the same amount of refrigerant oil to replacement
compressor.
( 4) - Information not available from manufacturer.
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NIPPONDENSO 10-CYLINDER
General Motors (Metro & Tracker)
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove A/C compressor. Drain, measure
and discard refrigerant oil from old compressor. Drain refrigerant oil
from replacement compressor. Add refrigerant oil to replacement
compressor equal to amount drained from oil compressor.
2) Add specified amount of refrigerant oil to components that
are replaced during compressor replacement. See NIPPONDENSO 10-
CYLINDER COMPONENT REFRIGERANT OIL CAPACITIES table. Install A/C
compressor. Evacuate and charge system. Perform leak test.
NIPPONDENSO 10-CYLINDER COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Compressor ..................................................... 3.0
Condenser .................................................. 0.7-1.0
Receiver-Drier ................................................. 0.3
System Total ................................................... 3.4
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NIPPONDENSO 10PA17/10PA17C 10-CYL.
Chrysler Corp. (Avenger & Sebring Coupe)
1) Remove A/C compressor. Drain and measure oil from old
compressor. Replacement compressor is shipped with 3.4 ounces of oil.
From replacement compressor, drain the difference between system oil
capacity and amount of oil drained from replacement compressor.
2) Add specified amount of refrigerant oil to components that
are replaced during compressor replacement. See 10PA17/10PA17C
COMPONENT REFRIGERANT OIL CAPACITIES table. When replacing components
listed, DO NOT exceed system total capacity.
Chrysler Corp. & Jeep (Caravan, Concorde, Grand Cherokee,
Intrepid, LHS, Neon, Town & Country, Voyager & 300M)
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Disconnect refrigerant hoses at
compressor. Remove compressor bolts and A/C compressor.
2) Remove suction port on top of A/C compressor, and drain
and measure oil. On Grand Cherokee, add the same amount of oil drained
from old compressor to replacement compressor.
3) On all other models, add amount of oil to compressor equal
to the total system capacity minus amount retained in components that
are not being replaced. See 10PA17/10PA17C COMPONENT REFRIGERANT OIL
CAPACITIES table. Install A/C compressor. Evacuate and charge A/C
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compressor oil from suction and discharge ports as possible. Rotate
compressor shaft 6-8 revolutions by hand, while pouring oil from
ports. Collect oil in a clean container and measure amount drained. DO
NOT reuse old refrigerant oil.
2) If amount drained is 3-5 ounces, add amount drained plus
one ounce of refrigerant oil to compressor. If amount drained is more
than 5 ounces, add the same amount that was drained from compressor.
If amount drained is less than 3 ounces, add 3 ounces to compressor.
See SANDEN SCROLL COMPONENT REFRIGERANT OIL CAPACITIES (TAURUS 3.4L
SHO) table. Add refrigerant oil through suction port.
3) Use new "O" rings on refrigerant lines. Install A/C
compressor. Perform leak test. Evacuate and charge system. Ensure A/C
system is operating properly.
SANDEN SCROLL COMPONENT REFRIGERANT OIL CAPACITIES (TAURUS 3.4L SHO)
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Component Ounces
Accumulator .................................................... (1)
Condenser ...................................................... 1.0
Evaporator ..................................................... 3.0
Other Components ........................................... ( 2) 2.0
( 1) - Drill two 1/2" holes in bottom of old accumulator, and drain and
measure oil. Add the same amount of oil drained plus 2 ounces of
new refrigerant oil to replacement accumulator.
( 2) - Add specified amount of refrigerant oil following replacement of
other system components such as hoses, fixed orifice tube, A/C
clutch cycling switch, compressor pressure relief valve, system
pressure cut-off switch, or service valve, compressor shaft
seal, "O" ring or hose leaks.
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SANDEN MSC90-C SCROLL
Chrysler Corp. (Avenger & Sebring Coupe)
1) Drain oil from old compressor, and measure amount drained.
Replacement compressor is shipped with 5.7 ounces of refrigerant oil.
From replacement compressor, drain the difference between system oil
capacity and amount of oil drained from replacement compressor.
2) Add specified amount of refrigerant oil for components
that are replaced. See SANDEN MSC90-C COMPONENT REFRIGERANT OIL
CAPACITIES table. When replacing components listed, DO NOT exceed
system total capacity.
SANDEN MSC90-C COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Condenser ...................................................... 0.5
Evaporator ..................................................... 2.0
Receiver-Drier ................................................. 0.3
Refrigerant Line ............................................... 0.3
System Total ................................................... 5.7
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SANDEN SD-7H15 7-CYLINDER
Chrysler Corp. & Jeep (Cherokee, Dakota, Durango, Ram Pickup
& Wrangler)
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove compressor and drain refrigerant
oil. Measure amount of oil removed and discard old oil.
Page 24 of 1691
recovery/recycling equipment. Measure amount of oil drained during A/C
system discharge. Disconnect refrigerant hoses at compressor. Remove
compressor bolts and A/C compressor.
2) Drain and measure oil from suction and discharge ports of
old compressor. Drain oil from replacement compressor and save. Add
the same amount of refrigerant oil to replacement compressor as was
drained from old compressor. When repairing an excessive leak in A/C
system, add one ounce additional oil to compressor.
3) Add proper amount of refrigerant oil to any components
being replaced. DO NOT add more refrigerant oil than A/C system total.
See SANDEN TRS-90 & TR-105 COMPONENT REFRIGERANT OIL CAPACITIES table.
Install compressor. Evacuate, charge and leak test A/C system. Ensure
A/C system operates properly.
SANDEN TRS-90 & TR-105 COMPONENT REFRIGERANT OIL CAPACITIES
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Component Ounces
Breeze, Cirrus, Sebring Convertible & Stratus
Compressor ................................................... (1)
Condenser .................................................... 1.0
Evaporator ................................................... 2.0
Receiver-Drier ............................................... 1.0
Refrigerant Line ............................................. 1.5
System Total ................................................. 5.0
Ram Van/Wagon
Compressor ................................................... ( 1)
Condenser .................................................... 1.0
Evaporator
Front ...................................................... 2.0
Rear ....................................................... 2.0
Receiver-Drier ............................................... 1.0
System Total
With Rear Unit ............................................ 10.0
Without Rear Unit .......................................... 8.0
( 1) - Ensure replacement compressor contains the same amount of
refrigerant oil as was drained from old compressor.
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ZEXEL ROTARY VANE
1) Slowly discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove old A/C compressor. Install
compressor oil drain Adapters (SA9149AC-5 and SA9149AC-6) to service
ports. Drain compressor oil from high-side port first and then low-
side port. Rotate compressor clutch plate in both directions to remove
oil from compressor. Measure oil amount drained, and discard oil.
2) New compressors are shipped with 5 ounces of refrigerant
oil and nitrogen gas. Open compressor sealing plugs slowly to release
nitrogen gas. Drain and measure oil into a clean container (this oil
will be used in new compressor).
3) Ensure amount of refrigerant oil in replacement compressor
is the same as amount removed from old compressor plus amount removed
during refrigerant recovery. This represents total system capacity,
minus amount retained in components that have not been replaced. See
ZEXEL COMPONENT REFRIGERANT OIL CAPACITIES table. Install compressor.
Evacuate, charge and leak test A/C system. Ensure A/C system operates
properly.
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A/C -H EA TE R S YSTE M
1999 D odge P ic ku p R 1500
1999 MANUAL A/C-HEATER SYSTEMS
CHRYSLER
Dakota, Durango & Ram Pickup
SPECIFICATIONS
SPECIFICATIONS \
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Application Specification
Compressor Type .............................. Sanden SD-7H15 7-Cyl.
Compressor Belt Tension ........................................ ( 1)
Refrigerant (R-134a) Capacity
With Rear A/C Unit ....................................... 30 ozs.
Without Rear A/C Unit .................................... 28 ozs.
System Oil Capacity
Dakota & Ram Pickup ................................. ( 2) 8.1 ozs.
Durango
With Rear A/C Unit ................................. ( 2) 8.0 ozs.
Without Rear A/C Unit .............................. ( 2) 5.5 ozs.
System Operating Pressures ( 3)
High Side ......................... 190-220 psi (13.4-15.5 kg/cm
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Low Side .............................. 32-40 psi (2.2-2.8 kg/cm)
( 1) - Dynamic tensioner automatically adjusts belt. Tension is okay if
indicator is within marked limits on belt tensioner.
( 2) - Use SP-20 PAG refrigerant oil.
( 3) - Measured at ambient air temperature of 80
F (27C). \
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WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY
article.
CAUTION: When battery is disconnected, radio will go into anti-theft
protection mode. Obtain radio anti-theft protection code from
owner prior to servicing vehicle.
DESCRIPTION
These systems are a blend-air type. Outside air enters
through a cowl at base of the windshield and flows through a plenum
chamber into blower housing. Airflow velocity is controlled by blower
speed selector switch. Air flows across evaporator and is directed by
a blend-air door to go either through or by-pass the heater core.
On Dakota and Durango, temperature control cable operates
blend-air door and allows immediate control of outlet air temperature.
It also controls operation of recirculation door. On Ram Pickup,
temperature is regulated by a blend-air servo motor controlled from
A/C-heater control panel rotary temperature dial. On all models, mode
selector switch controls vacuum-operated doors to direct conditioned
air to selected outlets.
Durango may also be equipped with an optional rear A/C unit.
The rear A/C unit consists of a blower motor and evaporator. It will
only operate while the front A/C is on. The optional rear A/C-heater
unit is controlled using fan and temperature switches.
Page 160 of 1691
4) Scan tool will automatically calculate system charge.
Depending on system charge condition, corrections are made 2 ounces at
a time. Each time a correction is made, recheck readings to ensure
proper charge. For system refrigerant capacity, see REFRIGERANT OIL &
REFRIGERANT SPECIFICATIONS article.
Breeze, Cirrus, Concorde, Intrepid, LHS, Stratus & 300M
(Manifold Gauge Set Method)
1) Attach clamp-on Thermocouple (80PK-1A) to liquid line, as\
close to condenser outlet as possible. Attach manifold gauge set to
vehicle.
2) Set parking brake, and place transaxle in Park position.
Start engine and allow to idle. Set A/C controls to outside air, panel
mode, full cool, and high blower speed. Turn A/C on, and open windows.
Operate system for a few minutes to allow system to stabilize.
3) Place cardboard over front grille area, to block airflow
through part of condenser, to set A/C pressure to 260 psi (18.3
kg/cm
). This will stop cooling fans from alternating speeds and
maintain constant pressure.
4) Record temperature reading at liquid line and discharge
pressure reading on gauges. Compare readings with values in
REFRIGERANT CHARGE LEVEL table.
5) Depending on system charge condition, corrections are made
2 ounces at a time. Each time a correction is made, recheck readings
to ensure proper charge. For system refrigerant capacity, see
REFRIGERANT OIL & REFRIGERANT SPECIFICATIONS article.
REFRIGERANT CHARGE LEVEL
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Liquid Line Temp. ( 1) Discharge Pressure F ( C) psi (kg/cm)
40 (4.4) ........................................... 53-75 (3.7-5.3\
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60 (15.6) ......................................... 81-104 (5.7-7.3\
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80 (26.7) ....................................... 111-142 (7.8-10.0\
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100 (37.8) ..................................... 156-194 (11.0-13.6\
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120 (48.9) ..................................... 208-259 (14.6-18.2\
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140 (60.0) ..................................... 272-331 (19.1-23.3\
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160 (71.1) ..................................... 353-420 (24.8-29.5\
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180 (82.2) ..................................... 447-516 (31.4-36.3\
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( 1) - When pressure is lower than specified, system is undercharged.
When pressure is higher than specified, system is overcharged.
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All Other Models
Ensure A/C system has been checked for leaks and evacuated.
See EVACUATING A/C SYSTEM and LEAK TESTING. Charge A/C system to
specifications. For system refrigerant capacity, see REFRIGERANT OIL &
REFRIGERANT SPECIFICATIONS article.
FORD MOTOR CO.
1) If using approved Recovery/Recycling/Charging Center (023-\
00105 or 023-00150), connect to high-side and low-side service valves.
See SERVICE VALVE LOCATIONS under SYSTEM SERVICE VALVES. Operate
charging center according to manufacturer's instructions. Charge
system with specified amount of refrigerant and refrigerant oil. See
REFRIGERANT OIL & REFRIGERANT SPECIFICATIONS article. Check amount of
refrigerant oil in system before adding oil. See COMPRESSOR
REFRIGERANT OIL CHECKING article.
2) If using manifold gauge set, connect to high-side and low-
side service valves. See SERVICE VALVE LOCATIONS under SYSTEM SERVICE
Page 407 of 1691
DRIV E A XLE - F B I S EM I- F LO ATIN G
1999 D odge P ic ku p R 1500
1998-99 DRIVE AXLES
CHRY - FBI Semi-Floating Axles
Ram Pickup
IDENTIFICATION
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Application Axle Ring Axle
Model Gear Size Ratio
Front Axle ........ 216 FBI ......... 8.50" .. 3.54, 3.92 & 4.09
Front Axle ........ 248 FBI ......... 9.75" ........ 3.54 & 4.10
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DESCRIPTION & OPERATION
The Front Beam-Design Iron (FBI) axles is of an iron center
casting (differential housing) with axle shaft tubes extending from
both sides. The tubes are pressed in to form a one-piece axle housing
and is a semi-floating design.
Axle contains an integral carrier with hypoid-type ring gear
and pinion with semi-floating axle shafts. Load is supported by hub
bearings. Axle shafts are retained by nuts at the hub bearings. Hub
bearings are bolted to steering knuckle at outboard end of axle tube
yoke. Hub bearings are serviced as an assembly. On vehicles equipped
with Anti-Lock (ABS) brakes, a brake sensor is mounted on knuckle
assemblies, and tone rings are pressed onto axle shaft.
Differential is a one-piece design and differential pinion
mate shaft is retained with a roll pin. Differential bearing preload
and ring gear backlash is adjusted by use of shims, and pinion bearing
preload is set and maintained by use of a collapsible spacer.
Axle shaft is engaged or disengaged by an axle vacuum shift
motor. Vacuum shift motor is operated by engine vacuum and is
controlled by a switch mounted on transfer case.
AXLE RATIO & IDENTIFICATION
NOTE: Axle ratio can be identified by axle identification tag
attached to axle housing cover. See IDENTIFICATION.
LUBRICATION
CAPACITY
DRIVE AXLE CAPACITY ( 1) \
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Application Pts. (L)\
216 FBI .................................................. 4.8 (2.3)\
248 FBI .................................................. 7.6 (3.6)\
(1) - Approximate drive axle capacity listed. Lubricant level should
be 1/2" below oil filler hole in axle housing cover.
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Page 421 of 1691
(1) - Approximate drive axle capacity listed. Lubricant level should
be within 1/2" below bottom of oil filler hole in axle housing
cover.
( 2) - Add container of Mopar Gear Oil Friction Modifier when
refilling.
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FLUID TYPE
Use SAE 80W-90 or SAE 90W hypoid gear lubricant with MIL-L-
2105-B and API GL-5 ratings. Also add a container of Mopar Gear Oil
Friction Modifier when refilling.
FLUID DRAIN & REFILL
1) With lubricant of rear axle assembly at normal operating
temperature, raise and support vehicle so rear wheels are free to
rotate. Clean around axle housing cover. Loosen axle housing cover
bolts. Drain lubricant from axle housing. Remove bolts and axle
housing cover.
2) Position differential so hole in differential case faces
down. Wipe all accessible areas of axle housing. Ensure sealing
surfaces on axle housing and cover are clean. Apply a 1/4" thick bead
of silicone sealant on inside of bolt holes and along sealing surfaces
on axle housing cover.
3) Install axle housing cover, axle identification tag and
retaining bolts. Tighten bolts to 30 ft. lbs. (41 N.m). Remove oil
filler plug. Add a container of Mopar Gear Oil Friction Modifier. Fill
axle with gear lube. Install oil filler plug. Lower vehicle.
TROUBLE SHOOTING
DIFFERENTIAL NOISE
1) Ensure differential lubricant is at normal operating
temperature. Road test vehicle. Note if differential noise exists in
turns, but not during straight-ahead driving. Probable cause is
incorrect or insufficient rear axle lubricant or additive.
2) Drain and refill rear axle. See FLUID DRAIN & REFILL under
LUBRICATION. Road test vehicle and note if noise still exists, it may
be necessary to disassemble rear axle so differential can be repaired.
See RBI FULL-FLOATING AXLES article for removal of differential case.
TESTING
NOTE: Power-Lok differential can be tested without removing
differential carrier from axle housing. Either test can be
used to check drive axle.
TEST I
1) Place blocks under both front wheels. Ensure engine is off
and transmission is in Neutral. Release parking brake. Raise one rear
wheel until it is completely clear of the floor. Remove wheel. Install
Adapter (6790) to wheel studs, and tighten securely.
2) Using torque wrench on adapter, rotate axle, and record
torque required. Repeat procedure for remaining rear wheel position.
If rotational torque for either rear wheel is less than 30 ft. lbs.
(41 N.m) or greater than 200 ft. lbs. (271 N.m), Power-Lok unit must\
be replaced or repaired.