differential LEXUS GS400 2000 Service Owner's Guide

SA0SA±01
F02403
SST
F02404
SST
F02405
SST
F03419
± SUSPENSION AND AXLEREAR DIFFERENTIAL SIDE GEAR SHAFT OIL SEAL
SA±61
2061 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
1. DRAIN DIFFERENTIAL OIL
2. REMOVE DRIVE SHAFT (See page SA±52)
3. REMOVE SIDE GEAR SHAFT
(a) Using SST and 2 bolts, remove the side gear shaft.
SST 09520±24010
(b) Remove the snap ring from the side gear shaft.
4. REMOVE SIDE GEAR SHAFT OIL SEAL
Using SST, remove the oil seal.
SST 09308±00010
5. INSTALL SIDE GEAR SHAFT OIL SEAL
(a) Using SST and a hammer, install a new oil seal.
SST 09608±32010, 09950±70010 (09951±07150)
(b) Apply MP grease to the oil seal lip.
6. INSTALL SIDE GEAR SHAFT
(a) Install a new snap ring to the side gear shaft.
(b) Using a brass bar and hammer, install the side gear shaft
to the differential.
NOTICE:
Be careful not to damage the side gear shaft and oil seal.
7. CHECK INSTALLATION OF SIDE GEAR SHAFT
(a) Check that there is 2 ± 3 mm (0.08 ± 0.12 in.) of play in
the axial direction.
(b) Check that the side gear shaft will not come out by trying
to pulling it out by hand.
8. INSTALL DRIVE SHAFT (See page SA±59)

R08549
Less than 5 mm (0.20 in.) SA±62
± SUSPENSION AND AXLEREAR DIFFERENTIAL SIDE GEAR SHAFT OIL SEAL
2062 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
9. FILL AND CHECK DIFFERENTIAL OIL LEVEL
Torque: 49 N´m (500 kgf´cm, 39 ft´lbf)
Oil grade: Hypoid gear oil API GL±5
Viscosity:
Above ±18°C (0°F) SAE 90
Below ±18°C (0°F) SAE 80W±90 or 80W
Capacity: 1.35 liters (1.43 US qts, 1.19 lmp qts)

SA0SB±03
37 (375, 27)
F03423
142 (1,450, 105)
110 (1,120, 80)
123 (1,250, 90)
7.4 (75, 65 in.´lbf)
Upper Mount Stopper
Differential
Washer
Lower Mount Stopper
Suspension Member Brace
Propeller Shaft
Heat Insulator
Front Floor Center Brace Heat Insulator
6
: Specified torque
 Non±reusable part
6
N´m (kgf´cm, ft´lbf)
83 (850, 61)
50 (510, 37)
75 (765, 55)
79 (805, 58)
79 (805, 58)
5.4 (55, 48 in.´lbf)
Exhaust Pipe
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±63
2063 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REAR DIFFERENTIAL CARRIER
COMPONENTS

F01950
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable part Gasket
Pinion Gear Shaft
Thrust Washer
Pinion Gear
Straight Pin
Side Gear
Thrust Washer

See page SA±73
X10
 Adjusting Washer
Outer Race
Drive Pinion Rear Bearing
Drive Pinion
Ring Gear
Differential CaseSide Bearing
Outer Race
Side Bearing
Drain Plug
49 (500, 39)
Breather Plug
21 (210, 15)
X8
47 (475, 34)
Differential
Carrier Cover49 (500, 39)
X8
Filler Plug
 Gasket

Companion Flange
 Dust Deflector
 Oil Seal
Drive Pinion Front BearingOuter Race
 Spacer
Adjust Plate
Washer
 O±Ring
Differential Carrier Retainer
X8
22 (225, 16)
 Oil Seal
 Dust Cover
 Snap Ring
Side Gear Shaft

Precoated part
See page SA±73
Oil SlingerOil Deflector
7.0 (70, 62 in.´lbf)
SA±64
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2064 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

SA0SC±01
F02394
Matchmarks
F03449
Matchmarks
F02353
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±65
2065 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE EXHAUST PIPE
(See page EM±97 or EM±120)
2. REMOVE PROPELLER SHAFT (See page PR±4)
3. DISCONNECT REAR DRIVE SHAFTS
(a) Place matchmarks on the adjusting cam and lower sus-
pension arm.
(b) Remove the bolt and nut, disconnect the No.2 lower sus-
pension arm from the axle hub.
Torque: 110 N´m (1,120 kgf´cm, 81 ft´lbf)
(c) Remove the bolt and nut, disconnect the No.1 lower sus-
pension arm from the axle hub.
Torque: 75 N´m (765 kgf´cm, 55 ft´lbf)
(d) Place matchmarks on the 2 drive shafts and side gear
shafts.
NOTICE:
Do not punch to mark the matchmarks. Use paint etc.
(e) Using a 10 mm hexagon wrench, remove the 6 hexagon
bolts and 2 washers with depressing the brake pedal.
Torque: 83 N´m (850 kgf´cm, 61 ft´lbf)
HINT:
At the time of installation, apply a light coat of engine oil on the
threads of the bolts.
(f) Disconnect the drive shafts from the differential carrier.
4. REMOVE DIFFERENTIAL
(a) Support the differential carrier with a jack.
(b) Using a 12 mm hexagon wrench, remove the 3 hexagon
bolts
Torque: 142 N´m (1,450 kgf´cm, 105 ft´lbf)
(c) Remove the 2 bolts and lower mount stoppers.
Torque: 123 N´m (1,250 kgf´cm, 90 ft´lbf)
(d) Remove the differential.

R08499
SA±66
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2066 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(e) Remove the 2 upper mount stoppers from the differential
carrier.

SA0SD±04
R00029
R00046
10 mm
(0.39 in.)
R00028
R00027
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±67
2067 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. REMOVE DIFFERENTIAL CARRIER COVER
(a) Remove the 8 bolts from the carrier cover.
(b) Using a brass bar and hammer, separate the cover from
carrier.
(c) Remove the breather plug from the differential carrier cov-
er.
2. SET DIFFERENTIAL CARRIER TO OVERHAUL STAND
ETC., AS SHOWN
3. CHECK RUNOUT OF DRIVE PINION SHAFT
Using a dial indicator, measure the runout of the drive pinion
shaft at a position 10 mm (0.39 in.) away from the end of the
shaft.
Maximum runout: 0.08 mm (0.0031 in.)
If the runout is greater than the maximum, replace the drive pin-
ion and ring gear.
4. CHECK RING GEAR RUNOUT
Using a dial indicator, measure the ring gear runout.
Maximum runout: 0.05 mm (0.0020 in.)
If the runout is greater than the maximum, replace the drive pin-
ion, ring gear and differential case.
5. CHECK RING GEAR BACKLASH
Using a dial indicator, measure the backlash of the ring gear at
3 points at least and check that the average value is within the
specification.
Backlash: 0.08 ± 0.13 mm (0.0031 ± 0.0051 in.)
NOTICE:
The difference between the maximum and minimum mea-
sured values must be less than 0.05 mm (0.0020 in.).
If the backlash is not within the specification, adjust the back-
lash (See page SA±73).

R00054
SST
R00054
SST
R00243
SST
R00047
SST SA±68
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2068 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. MEASURE DRIVE PINION PRELOAD
Using SST and a torque wrench, measure the preload using the
backlash of the drive pinion and ring gear.
Preload (at starting):
0.5 ± 0.8 N´m (5 ± 8 kgf´cm, 4.3 ± 6.9 in.´lbf)
HINT:
For vehicles which have run less than 8,000 km (5,000 miles),
the preload may be large.
SST 09229±55010
Maximum preload (at starting):
1.8 N´m (18 kgf´cm, 16.0 in.´lbf)
7. CHECK TOTAL PRELOAD
Using SST and a torque wrench, measure the preload with the
teeth of the drive pinion and ring gear in contact.
SST 09229±55010
Total preload (at starting):
Drive pinion preload plus
0.5 ± 0.8 N´m (5 ± 8 kgf´cm, 4.3 ± 6.9 in.´lbf)
If necessary, disassemble and inspect the differential.
8. CHECK PINION GEAR BACKLASH
Using a dial indicator, measure the pinion gear backlash with
holding one side gear toward the case.
Maximum: 0.15 mm (0.0059 in.)
NOTICE:
Differential gears should be able to rotate.
If the backlash is not within the specification, install the correct
thrust washer (See page SA±73).
9. CHECK TOOTH CONTACT PATTERN
(See page SA±73)
10. REMOVE SIDE GEAR SHAFTS
(a) Using SST, remove the 2 side gear shafts.
SST 09520±24010
NOTICE:
Be careful not to damage the oil seal.
(b) Using screwdriver, remove the 2 snap rings from the side
gear shafts.
11. REMOVE SIDE GEAR SHAFT OIL SEALS
Using SST, remove the 2 oil seals.
SST 09308±00010
12. REMOVE DIFFERENTIAL CARRIER RETAINERS
(a) Remove the 16 bolts.

R11079
SST
SST
R00022
R15856
SST
R00052
SST
R00024
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±69
2069 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Using SST, remove the 2 carrier retainers and washers.
SST 09950±40011, (09951±04020, 09952±04010,
09953±04030, 09954±04010, 09955±04061,
09957±04010, 09958±04011),
09950±60010 (09951±00450)
13. REMOVE DIFFERENTIAL CASE
Take the differential case out of the carrier with lifting the ring
gear side, as shown in the illustration.
14. REMOVE O±RINGS FROM DIFFERENTIAL CARRIER
RETAINERS
Using a screwdriver, remove the 2 O±rings.
15. REMOVE SIDE BEARING OUTER RACES AND AD-
JUSTING PLATE WASHERS
Using SST and a press, remove the 2 outer races and adjusting
plate washers.
SST 09950±60020 (09951±00710),
09950±70010 (09951±07150)
16. REMOVE DRIVE PINION, SPACER AND COMPANION
FLANGE
(a) Using a chisel and hammer, loosen the staked part of the
nut.
(b) Using SST, remove the nut.
SST 09229±55010, 09330±00021
(c) Using a press, remove the drive pinion with the rear bear-
ing and remove the companion flange.
NOTICE:
Be careful not to drop the drive pinion.
(d) Remove the spacer from the drive pinion.

R00042
SST
R09981
SST
SA1320
F03478
SST
R11085
Matchmarks SA±70
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2070 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
17. REMOVE OIL SEAL
Using SST, remove the oil seal.
SST 09308±00010
18. REMOVE OIL SLINGER AND FRONT BEARING
19. REMOVE REAR BEARING FRONT DRIVE PINION
Using SST and a press, remove the rear bearing from the drive
pinion.
SST 09950±00020
20. REMOVE FRONT AND REAR BEARING OUTER
RACES AND ADJUSTING PLATE WASHER
NOTICE:
Do not remove the outer race except when replacing the
bearings.
HINT:
Measure the washer and note the thickness for reassembly.
21. REMOVE SIDE BEARINGS
Using SST, remove the 2 side bearings from the differential
case.
SST 09950±40011, (09951±04020, 09952±04010,
09953±04030, 09954±04010, 09955±04061,
09957±04010, 09958±04011),
09950±60010 (09951±00450)
22. REMOVE RING GEAR
(a) Place matchmarks on the ring gear and differential case.
(b) Remove the 10 ring gear set bolts.
(c) Using a plastic hammer, tap on the ring gear to separate
it from the differential case.