LEXUS GS400 2000 Service Repair Manual

SA1130
SST
SST
R00052
SST
R00054
SST
R15899
SST SA±76
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2076 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(d) Using SST and a press, install the companion flange.
SST 09223±46011, 09325±40010
9. TEMPORARILY ADJUST DRIVE PINION PRELOAD
(a) Adjust the drive pinion preload by tightening the compan-
ion flange nut.
HINT:
Using SST to hold the flange, tighten the nut.
SST 09229±55010, 09330±00021
NOTICE:
As there is no spacer, tighten the nut a little at a time, being
careful not to overtighten it.
(b) Using SST and a torque wrench, measure the preload.
SST 09229±55010
Preload (at starting):
New bearing:
1.5 ± 1.8 N´m (15 ± 18 kgf´cm, 13.0 ± 15.6 in.´lbf)
Reused bearing:
0.5 ± 0.8 N´m (5 ± 8 kgf´cm, 4.3 ± 6.9 in.´lbf)
HINT:
For vehicles which have run 8,000 km (5,000 miles) or less, if
the preload value measured before disassembly is greater than
the specification for a reused bearing, return the preload to the
same as before disassembly.
10. INSTALL SIDE BEARING OUTER RACES AND AD-
JUSTING PLATE WASHERS
Using SST and a press, install the 2 adjusting plate washers
and outer races.
SST 09950±60020 (09951±00810),
09950±70010 (09951±07150)

R00022
R15900
SST RH
Front
R00027
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±77
2077 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
11. INSTALL DIFFERENTIAL CASE IN CARRIER
Install the drive side bearing in the differential carrier first, as
shown in the illustration, then install the differential case.
12. INSTALL DIFFERENTIAL CARRIER RETAINERS
(a) Using SST and a hammer, install 2 carrier retainers.
SST 09950±60020 (09951±00890),
09950±70010 (09951±07150)
(b) Tighten the 16 bolts.
Torque: 22 N´m (225 kgf´cm, 16 ft´lbf)
13. CHECK RING GEAR BACKLASH
Using a dial indicator, measure the backlash of the ring gear at
3 positions at least.
Backlash: 0.08 ± 0.13 mm (0.0031 ± 0.0051 in.)
NOTICE:
The difference between the maximum and minimum mea-
sure values must be less than 0.05 mm (0.0020 in.).
HINT:
The measured values should be used as reference when se-
lecting washers, so take a note of the values.

R00054
SST SA±78
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2078 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
If the backlash is not within the specification replace the washer
on the ring gear side with one of a different thickness using the
following procedure.
Adjusting washer thickness
No. Thickness mm (in.)No. Thickness mm (in.)No. Thickness mm (in.)
02 2.02 (0.0795)32 2.32 (0.0913)62 2.62 (0.1031)
04 2.04 (0.0803)34 2.34 (0.0921)64 2.64 (0.1039)
06 2.06 (0.0811)36 2.36 (0.0929)66 2.66 (0.1047)
08 2.08 (0.0819)38 2.38 (0.0937)68 2.68 (0.1055)
10 2.10 (0.0827)40 2.40 (0.0945)70 2.70 (0.1063)
12 2.12 (0.0835)42 2.42 (0.0953)72 2.72 (0.1071)
14 2.14 (0.0843)44 2.44 (0.0961)74 2.74 (0.1079)
16 2.16 (0.0850)46 2.46 (0.0969)76 2.76 (0.1087)
18 2.18 (0.0858)48 2.48 (0.0976)78 2.78 (0.1094)
20 2.20 (0.0866)50 2.50 (0.0984)80 2.80 (0.1102)
22 2.22 (0.0874)52 2.52 (0.0992)82 2.82 (0.1100)
24 2.24 (0.0882)54 2.54 (0.1000)84 2.84 (0.1118)
26 2.26 (0.0890)56 2.56 (0.1008)86 2.86 (0.1126)
28 2.28 (0.0898)58 2.58 (0.1016)±
30 2.30 (0.0906)60 2.60 (0.1024)±
14. MEASURE 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 the measured preload is less than the specification, replace
the washer of the ring gear's tooth surface side with a thicker
one.
If the preload is greater than the specification, replace the
washer of the ring gear's tooth surface side with a thinner one.
HINT:
Changing the snap ring thickness by 0.02 mm (0.0008 in.) will
change the total preload by approx. 0.1 N´m (1 kgf´cm, 0.9
in.´lbf).

R00020
SA1125
Proper Contact Pattern
Forward Reverse
SA1195
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±79
2079 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
15. INSPECT TOOTH CONTACT PATTERN
(a) Coat 3 or 4 teeth at the 3 different positions on the ring
gear with red lead.
(b) Hold the companion flange firmly and rotate the ring gear
in both directions.
(c) Inspect the tooth contact pattern.
If tooth contact pattern is not correct, replace the adjusting
washer installed on the front of the drive pinion rear bearing to
adjust it.
NOTICE:
Make sure to always use a new one when replacing adjust-
ing washer.
HINT:
Refer to the table on the next page for selection of the adjusting
washer.

V02917
Tooth contact pattern
ForwardReverse
+ 0.08 mm
(+ 0.0031 in.)
+ 0.14 mm
(+ 0.0055 in.)Adjusting washer selection
Replacing the washer with one
0.08 mm (0.0031 in.) thicker will
give proper contact pattern.
± 0.08 mm
(± 0.0031 in.)
± 0.14 mm
(± 0.0055 in.)Replacing the washer with one
0.14 mm (0.0055 in.) thicker will
give proper contact pattern.
Replacing the washer with one
0.08 mm (0.0031 in.) thicker
will give proper contact pattern.
Replacing the washer with one
0.14 mm (0.0055 in.) thicker will
give proper contact pattern. SA±80
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2080 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HINT:
Adjust washers in 42 (different thickness in 0.01 mm (0.004 in.))
units are available.
No. Thickness mm (in.)No. Thickness mm (in.)No. Thickness mm (in.)
87 1.87 (0.0736)01 2.01 (0.0791)15 2.15 (0.0846)
88 1.88 (0.0740)02 2.02 (0.0795)16 2.16 (0.0850)
89 1.89 (0.0744)03 2.03 (0.0799)17 2.17 (0.0854)
90 1.90 (0.0748)04 2.04 (0.0803)18 2.18 (0.0858)
91 1.91 (0.0752)05 2.05 (0.0807)19 2.19 (0.0862)
92 1.92 (0.0756)06 2.06 (0.0811)20 2.20 (0.0866)
93 1.93 (0.0760)07 2.07 (0.0815)21 2.21 (0.0870)
94 1.94 (0.0764)08 2.08 (0.0819)22 2.22 (0.0874)
95 1.95 (0.0768)09 2.09 (0.0823)23 2.23 (0.0878)
96 1.96 (0.0772)10 2.10 (0.0827)24 2.24 (0.0882)
97 1.97 (0.0776)11 2.11 (0.0831)25 2.25 (0.0886)
98 1.98 (0.0780)12 2.12 (0.0835)26 2.26 (0.0890)
99 1.99 (0.0783)13 2.13 (0.0839)27 2.27 (0.0894)
00 2.00 (0.0787)14 2.14 (0.0843)28 2.28 (0.0898)
16. REMOVE DIFFERENTIAL CARRIER RETAINERS
(See page SA±67)
17. REMOVE DIFFERENTIAL CASE (See page SA±67)
18. REMOVE DRIVE PINION (See page SA±67)
19. INSTALL SPACER ON DRIVE PINION
Install a new spacer on the drive pinion.
20. INSTALL DRIVE PINION AND FRONT BEARING
(See step 8)
21. INSTALL OIL SLINGER (See step 8)

R00040
SST
SA1130
SST
SST
R00587
SST
R00054
SST
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±81
2081 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
22. INSTALL OIL SEAL
(a) Apply MP grease to a new oil seal lip.
(b) Using SST, install the oil seal until its end is flush with the
surface of the differential carrier.
SST 09316±60011 (09316±00011, 09316±00041),
09502±12010
23. INSTALL COMPANION FLANGE
Using SST and a press, install the companion flange.
SST 09223±56010, 09325±40010
NOTICE:
Be careful not to damage the oil seal.
24. ADJUST DRIVE PINION PRELOAD
(a) Coat the threads and flange of a new nut with hypoid gear
oil for LSD.
(b) Using SST, tighten the nut.
SST 09229±55010, 09330±00021
(c) Using SST and a torque wrench, measure the preload.
SST 09229±55010
Preload (at starting):
New bearing:
1.5 ± 1.8 N´m (15 ± 18 kgf´cm, 13.0 ± 15.6 in.´lbf)
Reused bearing:
0.5 ± 0.8 N´m (5 ± 8 kgf´cm, 4.3 ± 6.9 in.´lbf)

R00587
SST
R00032
R15856
SST
R00034
SA±82
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2082 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
If the preload is greater than the specification, replace the
spacer.
If the preload is less than the specification, retighten the nut with
a force of 13 N´m (130 kgf´cm, 9 ft´lbf) at a time until the speci-
fied preload is reached.
Torque: 490 N´m (5,000 kgf´cm, 362 ft´lbf) or less
If the maximum torque is exceeded while retightening the nut,
replace the spacer and repeat the preload procedure.
Do not back off the nut to reduce the preload.
25. CHECK RUNOUT OF DRIVE PINION SHAFT
(See page SA±67)
26. INSTALL DIFFERENTIAL CASE IN CARRIER
(See step 11)
27. INSTALL O±RING FROM DIFFERENTIAL CARRIER
RETAINERS
(a) Coat 2 new O±rings with hypoid gear oil.
(b) Install the 2 O±rings to the carrier retainers.
28. INSTALL OIL SEALS FROM DIFFERENTIAL CARRIER
RETAINERS
(a) Using SST and a press, install 2 new oil seals to the carrier
retainers.
SST 09608±32010, 09950±70010 (09950±07150)
(b) Coat the MP grease to the oil seal lip.
29. INSTALL DIFFERENTIAL CARRIER RETAINERS
30. RECHECK BACKLASH, TOTAL PRELOAD AND
TOOTH CONTACT PATTERN
31. STAKE DRIVE PINION NUT
32. INSTALL SNAP RINGS TO SIDE GEAR SHAFTS
(a) Install 2 new snap rings to the side gear shafts.
(b) Coat the MP grease to the snap rings.

R00240
F02352
FIPG
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
SA±83
2083 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
33. INSTALL SIDE GEAR SHAFTS
Using a brass and hammer, install the 2 side gear shafts.
HINT:
Whether or not the side gear shaft is making contact with the
pinion shaft can be known by the sound or feeling when driving
it in.
NOTICE:
Be careful not to damage the oil seal.
34. REMOVE DIFFERENTIAL CARRIER FROM OVER-
HAUL STAND, ETC.
35. INSTALL DIFFERENTIAL CARRIER COVER
(a) Clean the contact surfaces of the carrier and cover of any
residual FIPG material using cleaner.
(b) Coat FIPG to the carrier or cover.
FIPG:
Part No. 08826±00090, THREE BOND 1281 or equiva-
lent
(c) Install the carrier cover to the carrier with the 8 bolts.
Torque: 47 N´m (475 kgf´cm, 34 ft´lbf)
(d) Install the breather plug.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)

SA0SG±01
SA±84
± SUSPENSION AND AXLEREAR DIFFERENTIAL CARRIER
2084 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal (See page SA±65).
AFTER INSTALLATION, FILL DIFFERENTIAL OIL (See page SA±61)

SA0SH±01
R00087
SST
R00089
RH Side
LH Side
Z04032
LHRH
SST
R00088
R00090
± SUSPENSION AND AXLEDIFFERENTIAL MOUNTING CUSHION
SA±85
2085 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DIFFERENTIAL MOUNTING
CUSHION
REPLACEMENT
1. REMOVE DIFFERENTIAL (See page SA±65)
2. REMOVE DIFFERENTIAL MOUNTING CUSHION
Using SST, remove the differential mounting cushion.
SST 09316±12010, 09570±24010
NOTICE:

When driving out the mounting cushion, be careful
not to touch the suspension member with the SST.

Align the SST straight so that the bolt of the SST is
parallel with the center line of the mounting cushion.

When installing the bolts to the LH and RH differential
mounting cushions, make sure that the bolts are
passed through the correct holes in the SST, as
shown in the illustration.
3. INSTALL DIFFERENTIAL MOUNTING CUSHION
Using SST, install the cushion so that the marks are positioned,
as shown in the illustration.
SST 09570±24010
NOTICE:

Pay enough attention to LH and RH sides or top and
bottom.

Set the SST after temporarily installing the differential
mounting cushion into the member so as not to install
at an angle.

To confirm that the differential mounting cushion is
aligned straight in relation to the member, check that
the SST is fully in contact with all of the cushion.
4. INSTALL DIFFERENTIAL (See page SA±84)