GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • DT 46451 (DW240-020) Brake Clutch Spring Compressor
    • DT 46454 (DW240-050) Overdrive Brake Adapter
    • DT 46455 (DW240-060-01) Brake Spring Compressor Bolt/Nut
    • DT 46456 (DW240-060-02) Brake Spring Compressor Plate
    • DT 46457 DW240-070) 1st/Reverse Brake Adapter
    • DT 46458 2nd Brake Adapter
    • DT 46460 (DW240-100) Counter Drive Gear Installation Adapter
    • DT 46461 (DW240-130) Differential Preload Adapter
    • DT 46462 (DW240-140) Transaxle Housing Side Bearing Outer Race Adapter
    • DT 46464 (DW240-160) Transaxle Case Outer Tapered Roller Bearing Race Adapter
    • DT 46465 Adapter Handle
    • DT 46471 (DW260-031-01) Transaxle Housing Oil Seal Installer
    • DT 46472 (DW260-041) Planetary Ring Gear Nut Removal/Installation Socket
    • DT 47521 (DW 260-031-02) Transaxle Case Oil Seal Installer

Assembly Procedure


    Object Number: 1245944  Size: SH
  1. Install 4 new O-rings to the 4 screw plugs.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the 4 screw plugs with the O-rings to the transaxle rear cover and tighten to 7.4 N·m (65 lb in).

  4. Object Number: 1245946  Size: SH
  5. Install the 2 seal rings to the transaxle rear cover.

  6. Object Number: 1245948  Size: SH
  7. Using the vernier calipers, measure the free length of the overdrive (O/D) brake piston return spring together with the spring seat.
  8. Specification
    The standard free length is 18.99 mm (0.7476 in).


    Object Number: 1245947  Size: SH
  9. Coat 2 new O-rings (1) with automatic transaxle fluid (ATF), install them to the O/D brake piston.

  10. Object Number: 1245950  Size: SH

    Note: Be careful not to damage the O-rings of the O/D brake piston.

  11. Coat the O/D brake piston with ATF, install it to the transaxle rear cover.

  12. Object Number: 1245936  Size: SH

    Caution: In order to prevent damage to the brake piston, do not depress the brake piston lower than 1-2 mm (0.039-0.078 in) beyond the snap ring groove.

  13. Using the DT 46451  (1), DT 46454  (2) and a driver, install the O/D brake return spring and snap ring to the transaxle rear cover.

  14. Object Number: 1245951  Size: SH
  15. Using the DT 46462  (2), DT 46465  (1), install a new side bearing outer race into the transaxle housing.

  16. Object Number: 1245952  Size: SH
  17. Using the DT 46471  (1) and a hammer, drive in a new transaxle housing oil seal.
  18. Specification
    The oil seal in depth is 3.1 mm (0.122 in).


    Object Number: 1245931  Size: SH

    Note: Press-fit the outer tapered roller bearing race until it contacts the transaxle housing.

  19. Install a new outer tapered roller bearing race into the transaxle housing.

  20. Object Number: 1245940  Size: SH
  21. Install the transaxle lube apply pipe and differential gear lube apply pipe to the transaxle housing.
  22. Install the No. 1 transaxle apply pipe clamp to the transaxle housing with the bolt and tighten to 5.4 N·m (48 lb in).

  23. Object Number: 1245935  Size: SH
  24. Install the oil reservoir lock plate to the transaxle housing with the 3 bolts and tighten to 5.4 N·m (48 lb in).

  25. Object Number: 1245930  Size: SH

    Note: First install a shim of the same thickness as before.

  26. Install the shim to the transaxle case.
  27. Install a new bearing outer race into the transaxle case.

  28. Object Number: 1245949  Size: SH
  29. Using the DT 47521  (1) and a hammer, drive in a new transaxle case oil seal.
  30. Specifications
    The oil seal in depth is 4.3 mm (0.169 in).


    Object Number: 1245954  Size: SH

    Note: First install a shim of the same thickness as before.

  31. Install the shim to the transaxle case.
  32. Note: Press-fit the shim until it contacts the transaxle case.

  33. Using the DT 46464  (2) and DT 46465  (1), press in a new outer tapered roller bearing race into the transaxle case.

  34. Object Number: 1245953  Size: SH
  35. Install the No. 1 transaxle case plate to the transaxle case with the bolt and tighten to 9.8 N·m (87 lb in).

  36. Object Number: 1245956  Size: SH
  37. Install the differential gear to the transaxle case.

  38. Object Number: 1245958  Size: SH
  39. Install the transaxle housing and tighten the 16 bolts of the transaxle housing temporarily.
  40. Tighten 8 or 9 bolts out of the 16 bolts of the transaxle housing completely and tighten to 29 N·m (22 lb ft).

  41. Object Number: 1245959  Size: SH
  42. Using the DT 46461 , turn the differential gear assembly right and left 2 or 3 times to allow the bearing to settle.

  43. Object Number: 1245955  Size: SH

    Note: Note down the measured valve.

  44. Using the DT 46461 and a small torque wrench, measure the preload of the differential gear.

  45. Object Number: 1245960  Size: SH
  46. Remove the transaxle housing and install the counter driven gear.

  47. Object Number: 1245958  Size: SH
  48. Install the transaxle housing and tighten the 16 bolts of the transaxle housing temporarily.
  49. Tighten the bolts of the transaxle housing in the same manner as in step 22 and tighten to 29 N·m (22 lb in).

  50. Object Number: 1245959  Size: SH
  51. Using a DT 46461 , turn the differential gear assembly right and left 2 or 3 times to allow the bearing to settle.

  52. Object Number: 1245955  Size: SH
  53. Using a DT 46461 and a small torque wrench, measure the preload of the differential gear. From this valve deduct the valve measured in step 24. This is the preload of the counter driven gear.
  54. Specification

        • The preload for a new bearing is 0.33-0.76 N·m (3.21-6.77 lb in).
        • The preload for a used bearing is 0.17-0.38 N·m (1.48-3.39 lb in).

    Object Number: 1245963  Size: SH

    Note: When the preload is larger than the specification, select a thinner adjuster shim. When the preload is smaller than specification, select a thicker adjuster shim.

    If the preload of the counter driven gear does not satisfy the specification, select the adjuster shim from the table below and re-measure the valve. Until the valve is within the specification, repeat the procedure.

  55. Using the vernier calipers, measure the free length of the 1st and reverse brake piston return spring together with the spring seat.
  56. Specification
    The standard free length is 18.053 mm (0.71075 in).


    Object Number: 1245961  Size: SH

    Note: If the lining of the disc is peeling off or discolored, or even if a part of the groove is defaced, replace all discs.

    Note: Before assembling the new discs, soak them in ATF for at least 15 minutes.

  57. Check to see if the sliding surface of the disc, plate and the flange of the 1st and reverse brake are worn or burnt. Replace them, if necessary.

  58. Object Number: 1245934  Size: SH
  59. Coat 2 new O-rings (1) with ATF, install them to the 1st and reverse piston.

  60. Object Number: 1375541  Size: SH

    Note: Be careful not to damage the O-rings of the 1st and reverse brake piston.

  61. Install the 1st and reverse brake piston to the transaxle case.

  62. Object Number: 1245964  Size: SH
  63. Install the return spring to the transaxle case.

  64. Object Number: 1245965  Size: SH
  65. Install the 4 plates, 4 discs and flange.
  66. Install in order: 2-1-2-1-2-1-2-1-3, 3=Plate, 1=Disc, 2=Flange.


    Object Number: 1245938  Size: SH

    Note: Make sure that the snap ring is installed in the groove of the transaxle case correctly.

  67. Using the DT 46457  (2) and DT 46455  (1) install the snap ring.

  68. Object Number: 1245966  Size: SH

    Note: If the piston stroke is non-standard, inspect the discs, plates and flange. The piston stroke is 0.6-1.3 mm (0.024-0.051 in).

  69. Using a dial indicator, measure the 1st and reverse brake piston stroke while applying and releasing 392-785 kPa (57-114 psi) of compressed air through port (1).

  70. Object Number: 1245967  Size: SH

    Note: Be careful not to apply excessive force to the transaxle case.

  71. Using the DT 46460  (3), DT 46455  (2) and DT 46456  (1), install the counter drive gear.

  72. Object Number: 1245968  Size: SH
  73. Coat a new oil seal with ATF.
  74. Install the oil seal to the transaxle case.
  75. Specification
    The oil seal in depth (a) is 0.75-1.25 mm (0.3802-0.3998 in).


    Object Number: 1245921  Size: SH
  76. Install the parking lock rod to the manual valve lever.

  77. Object Number: 1245969  Size: SH
  78. Install a new spacer to the manual valve lever.

  79. Object Number: 1245970  Size: SH
  80. Install the manual valve lever shaft and manual valve lever.

  81. Object Number: 1245919  Size: SH
  82. Using a pin punch and hammer, drive in a new pin.

  83. Object Number: 1245971  Size: SH
  84. Turn the spacer and the lever shaft to align the small hole for locating the staking position in the spacer with the staking position mark on the lever shaft.
  85. Using a pin punch, stake the spacer through the small hole.
  86. Check that the spacer does not turn.

  87. Object Number: 1245917  Size: SH
  88. Install the manual detent spring with the bolts and tighten to 9.8 N·m (87 lb in).

  89. Object Number: 1245916  Size: SH
  90. Install the parking lock shaft, torsion spring and parking lock pawl.

  91. Object Number: 1245972  Size: SH
  92. Check that the edge of the torsion spring fits into the groove securely.

  93. Object Number: 1245915  Size: SH
  94. Install the parking lock pawl bracket with the 2 bolts and tighten to 7.4 N·m (65 lb in).

  95. Object Number: 1245973  Size: SH
  96. Using the DT 46460  (2) and the DT 46455  (1), install the planetary ring gear.
  97. Before installing the planetary ring gear, be sure to replace the planetary ring flange of the planetary ring gear with a new one.

  98. Object Number: 1245914  Size: SH
  99. Fix the counter drive gear with the parking lock pawl.

  100. Object Number: 1245906  Size: SH
  101. Using the DT 46472  (1), install a new nut and tighten to 9.8 N·m (87 lb in).

  102. Object Number: 1245975  Size: SH
  103. Using a small torque wrench, while turning to counter drive gear 100 turn per minute and measure the preload, install the nut and tighten to 29 N·m (22 lb ft) or less..
  104. Specification
    When the preload is smaller than the specification, tighten the nut more and adjust the preload to 0.05-0.35 N·m (0.43-3.12 lb in).

  105. Stake the nut.

  106. Object Number: 1245974  Size: SH
  107. Install the planetary gear to the transaxle case.

  108. Object Number: 1245976  Size: SH
  109. Coat the planetary carrier thrust washer with petroleum jelly and install it onto the planetary gear.

  110. Object Number: 1245977  Size: SH
  111. Install the No. 2 one-way clutch to the transaxle case.

  112. Object Number: 1245979  Size: SH
  113. Check that the planetary gear turns freely counterclockwise and locks clockwise.

  114. Object Number: 1245980  Size: SH
  115. Install the anti-rattle clip in the place shown in the illustration (the space between the No. 2 one-way clutch outer race and transaxle case), push the anti-rattle clip in until you hear the click.

  116. Object Number: 1245978  Size: SH
  117. Using vernier calipers, measure the free length of the 2nd brake piston return spring together with the spring seat.
  118. Specification
    The standard free length is 15.85 mm (0.6240 in).


    Object Number: 1245981  Size: SH

    Note: If the lining of the disc is peeling off or discolored, or even if a part of the groove is defaced, replace all discs.

    Note: Before assembling the new discs, soak them in ATF for at least 15 minutes.

  119. Check to see if the sliding surface of the disc, plate and flange of 2nd brake are worn or burnt. Replace them, if necessary.

  120. Object Number: 1245983  Size: SH

    Note: Make sure the snap ring is installed in the groove of the transaxle case correctly.

  121. Install the flange, 2 discs and 2 plates.
  122. Install in this order 2-1-3-1-3, 1=Disc, 3=Plate, 2=Flange.
  123. Install the 2nd brake return spring.

  124. Object Number: 1245910  Size: SH

    Object Number: 1245984  Size: SH

    Note: Be careful not to damage the O-rings.

  125. Install the 2nd brake piston into the 2nd brake clutch cylinder.
  126. Coat 2 new O-rings (1) with ATF, install them to the 2nd brake piston.


    Object Number: 1245982  Size: SH
  127. Install the 2nd brake clutch cylinder to the transaxle case.

  128. Object Number: 1245908  Size: SH
  129. Using the DT 46455  (1) and DT 46458  (2), compress the 2nd brake piston return spring.
  130. Note: Make sure that the snap ring is installed in the groove of the transaxle case correctly.

  131. Using the screwdriver, install the snap ring.

  132. Object Number: 1245985  Size: SH
  133. Coat the thrust bearing race with petroleum jelly and install it onto the front planetary sun gear.
  134. Specification

        • The race inner diameter is 19.3 mm (0.760 in).
        • The race outer diameter is 29.0 mm (1.142 in).

    Object Number: 1245907  Size: SH
  135. Install the front planetary sun gear to the transaxle case.

  136. Object Number: 1245904  Size: SH
  137. Install the thrust washer and one-way clutch assembly to the rear planetary sun gear.

  138. Object Number: 1245986  Size: SH

    Note: Check the direction of the bearing.

  139. Coat the thrust bearing race with petroleum jelly and install it onto the rear planetary sun gear and one-way clutch assembly.
  140. Specification

        • The bearing inner diameter 42.5 mm (1.673 in).
        • The bearing outer diameter 57.5 mm (2.264 in).

    Object Number: 1245900  Size: SH
  141. Install the rear planetary sun gear and one-way clutch assembly to the transaxle case.

  142. Object Number: 1245987  Size: SH

    Note: Check the direction of the race.

  143. Coat the thrust bearing race with petroleum jelly and install it onto the transaxle case.
  144. Specification

        • The race inner diameter is 34.95 mm (1.3760 in).
        • The race outer diameter is 45.50 mm (1.7913 in).

    Object Number: 1245988  Size: SH

    Note: Check the direction of the bearing.

  145. Coat the thrust needle roller bearing with petroleum jelly and install it onto the forward clutch hub.
  146. Specification

        • The bearing inner diameter is 33.3 mm (1.311 in).
        • The bearing outer diameter is 46.5 mm (1.831 in).

    Object Number: 1245886  Size: SH

    Object Number: 1245990  Size: SH
  147. Coat the thrust bearing race with petroleum jelly and install it onto the forward clutch hub.
  148. Specification

        • The race inner diameter is 19.3 mm (1.760 in).
        • The race outer diameter is 30.6 mm (1.205 in).
  149. Install the forward clutch hub to the transaxle case.

  150. Object Number: 1245888  Size: SH
  151. Install the thrust bearing race and thrust needle roller bearing to the forward and reverse clutch assembly.
  152. Specification

        • The race inner diameter is 18.1 mm (0.713 in).
        • The race outer diameter is 28.2 mm (1.110 in).
        • The bearing inner diameter is 18.1 mm (0.713 in).
        • The bearing outer diameter is 29.6 mm (1.165 in).

    Object Number: 1245989  Size: SH
  153. Install the forward and reverse clutch assembly to the transaxle case.

  154. Object Number: 1245961  Size: SH

    Note: If the lining of the disc is peeling off or discolored, or even if the part of the printed mark is defaced, replace all discs.

    Note: Before assembling new discs, soak them in ATF for at least 15 minutes.

  155. Check to see if the sliding surface of the disc, plate and flange of 2nd coast and O/D brake are worn or burnt. Replace them, if necessary.

  156. Object Number: 1245991  Size: SH

    Note: Make sure that the snap ring is installed in the groove of the transaxle case correctly.

  157. Using a screwdriver, install the snap ring to the transaxle case.

  158. Object Number: 1245889  Size: SH
  159. Install the flange, 2 discs and 2 plates to the transaxle case.
  160. Install in the following order: 3-2-3-2-1, 3=Plate, 2=-Disc, 1=Flange.

  161. Clean the connected part the transaxle case and transaxle rear cover.

  162. Object Number: 1245992  Size: SH
  163. As shown in the illustration, place a straight edge on the transaxle case and measure the distance between the 2nd coast and O/D brake flange and straight edge using vernier calipers (a).

  164. Object Number: 1245994  Size: SH
  165. As shown in the illustration, place a straight edge on the O/D brake piston and measure the distance between the transaxle rear cover and the straight edge using vernier calipers (a).
  166. Calculate the piston stroke value using the following formula. Select a flange which satisfies the piston stroke value and install it.

  167. Object Number: 1245893  Size: SH
  168. Install 4 new apply gaskets to the transaxle rear cover.

  169. Object Number: 1245993  Size: SH
  170. Coat the thrust needle roller bearing with petroleum jelly and install it onto the forward and reverse clutch assembly.
  171. Specification

        • The bearing inner diameter is 43.2 mm (1.701 in).
        • The bearing outer diameter is 62.0 mm (2.441 in).
  172. Remove any packing material. Do not get oil on the contacting surfaces of the transaxle rear cover or transaxle case.

  173. Object Number: 1245996  Size: SH
  174. Apply formed in place gasket (FIPG) to the transaxle rear cover.
  175. Specification
    The FIPG three bond 1281, or equivalent, seal bend width is 1.2 mm (0.047 in).


    Object Number: 1245995  Size: SH
  176. Install the transaxle rear cover to the transaxle case with the 9 bolts and tighten to 25 N·m (18 lb ft).

  177. Object Number: 1245890  Size: SH
  178. Install the counter driven gear assembly to the transaxle case.

  179. Object Number: 1245884  Size: SH
  180. Install the differential gear assembly to the transaxle case.

  181. Object Number: 1245998  Size: SH
  182. Install the direct clutch hub to the transaxle case.

  183. Object Number: 1245997  Size: SH
  184. Install the thrust bearing race and thrust needle roller bearing to the transaxle case.
  185. Specification

        • The race inner diameter is 20.5 mm (0.807 in).
        • The race outer diameter is 32.6 mm (1.283 in).
        • The bearing inner diameter is 17.8 mm (0.701 in).
        • The bearing outer diameter is 30.2 mm (1.189 in).

    Object Number: 1245897  Size: SH
  186. Install the clutch assembly to the transaxle case.

  187. Object Number: 1245899  Size: SH
  188. Install the new apply gasket.

  189. Object Number: 1246000  Size: SH

    Note: Check the direction of the bearing.

  190. Install the thrust needle roller bearing to the transaxle case.
  191. Place the oil pump through the input shaft, and align the bolt holes of the oil pump with the transaxle case.
  192. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1245881  Size: SH
  193. Install the 6 oil pump bolts and tighten to 25 N·m (18 lb ft).

  194. Object Number: 1245882  Size: SH

    Note: If the end play is not as specified, select and replace the thrust needle roller bearing.

  195. Measure the end play in axial direction.
  196. Specification

        • The end play is 0.3-0.9 mm (0.012-0.035 in).
        • The bearing inner diameter is 32.5 mm (1.280 in).
        • The bearing outer diameter is 48.5 mm (1.909 in).
        • The bearing thickness is 4.21 mm (0.1657 in).
        • The bearing inner diameter is 32.9 mm (1.295 in).
        • The bearing outer diameter is 48.5 mm (1.909 in).
        • The bearing thickness is 3.62 mm (0.1425 in).

    Object Number: 1245999  Size: SH
  197. Make sure that the input shaft rotates smoothly.

  198. Object Number: 1246001  Size: SH
  199. Remove any packing material. Do not get oil on the contacting surfaces of the transaxle housing or transaxle case.
  200. Apply formed in place gasket (FIPG) to the transaxle housing.
  201. Specification
    FIPG: Three bond 1281 or equivalent, seal bend width is 1.2 mm (0.047 in).


    Object Number: 1246002  Size: SH
  202. Install the transaxle housing to the transaxle case with the 16 bolts and tighten to 29 N·m (22 lb ft)..
  203. Apply seal packing or equivalent to the bolts.

  204. Object Number: 1245876  Size: SH
  205. Coat a new O-ring (1) with ATF, install it to the transaxle wire.

  206. Object Number: 1245877  Size: SH
  207. Install the transaxle wire to the transaxle case with the bolt and tighten to 5.4 N·m (48 lb in).

  208. Object Number: 1246003  Size: SH
  209. Coat new 6 O-rings with ATF and install them to the pistons (1, 2, 3).
  210. Coat the 3 springs and 3 accumulator pistons with ATF, install them to the holes.

  211. Object Number: 1245857  Size: SH
  212. Coat a new apply gasket with ATF, install it to the transaxle case.

  213. Object Number: 1245885  Size: SH
  214. Coat a new brake drum gasket with ATF, install it to the transaxle case.

  215. Object Number: 1245870  Size: SH
  216. Install the spring and check valve.

  217. Object Number: 1246004  Size: SH
  218. Connect the manual valve control rod to the manual valve lever as shown in the illustration.

  219. Object Number: 1245868  Size: SH

    Note: When installing the valve body to the transaxle case, do not let each of the accumulator pistons incline. When installing the valve body to the transaxle case, do not hold the solenoids.

  220. Install the valve body assembly to the transaxle case with the bolts and tighten to 11 N·m (97 lb in).

  221. Object Number: 1245869  Size: SH
  222. Connect the transaxle wire connector and harness to the valve body assembly.
  223. Connect the 5 connectors.
  224. 117.1. Lock-up control solenoid (5)
    117.2. Pressure control solenoid (1)
    117.3. No. 2 shift solenoid (2)
    117.4. No. 1 shift solenoid (3)
    117.5. Timing solenoid (4)

    Note: Make sure that the transaxle wire does not come out from the oil pan installations surface.

  225. Install the TFT sensor with clamp.

  226. Object Number: 1245867  Size: SH
  227. Install a new gasket to the oil strainer.

  228. Object Number: 1245866  Size: SH
  229. Install the oil strainer to the valve body with the 3 bolts and tighten to 9.8 N·m (87 lb in).

  230. Object Number: 1246005  Size: SH

    Object Number: 1245862  Size: SH
  231. Install a new gasket to the oil pan and install them to the transaxle case with the 18 bolts, tighten the bolts to 7 N·m (62 lb in)
  232. Install the 2 magnets in the oil pan.


    Object Number: 1245864  Size: SH
  233. Install the output shaft speed (OSS) sensor with the bolt and tighten to 7.4 N·m (65 lb in)..

  234. Object Number: 1245863  Size: SH
  235. Install the No. 1 breather plug.
  236. Install the input shaft speed (ISS) sensor with the bolt and tighten to 5.4 N·m (48 lb in).

  237. Object Number: 1245865  Size: SH
  238. Coat the new O-ring the ATF, install it to the screw plug.
  239. Install the screw plug to the transaxle case and tighten to 7.4 N·m (65 lb in)..

  240. Object Number: 1245859  Size: SH
  241. Coat the 2 new O-rings with ATF, install them to the unions.
  242. Install the 2 unions to the transaxle case and tighten to 25 N·m (18 lb ft).

  243. Object Number: 1245824  Size: SH
  244. Install the PNP switch to the manual valve lever shaft and temporarily install the 2 adjusting bolts.
  245. Install a new lock washer and nuts and tighten to 12 N·m (106 lb in.

  246. Object Number: 1246006  Size: SH
  247. Temporarily install the control lever.

  248. Object Number: 1245822  Size: SH
  249. Turn the lever counterclockwise until it stops, turn it clockwise 2 notches.
  250. Remove the control lever.

  251. Object Number: 1245808  Size: SH
  252. Align the groove with the neutral basic line.

  253. Object Number: 1245810  Size: SH
  254. Using a screwdriver, stake the nut with the lock washer.

  255. Object Number: 1245825  Size: SH
  256. Install the control lever, washer and nut and tighten to 12 N·m (106 lb in).
  257. Install the 2 bolts and tighten to 5.4 N·m (48 lb in).

  258. Object Number: 1246008  Size: SH
  259. Install the torque converter (2) to the transaxle.
  260. Measure the installation depth of the torque converter.
  261. Specification
    The standard value is 11.1 mm (0.44 in).

  262. If the measured value is beyond the standard value, readjust the torque converter within the specified value.