GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • 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 46457 (DW240-070) 1st and Reverse Brake Adapter
    • DT 46463 (DW240-150) Transaxle Case Side Bearing Outer Race Adapter
    • DT 46465 (DW240-170) Adapter Handle
    • DT 46453 (DW260-021) Automatic Transaxle Overhaul Fixture
    • DT 46472 (DW260-041) Planetary Ring Gear Nut Removal/Installation Socket

Disassembly Procedure


    Object Number: 1245858  Size: SH
  1. Remove the transaxle assembly from the vehicle. Refer to Transmission Replacement .
  2. Install the transaxle assembly to the transaxle support stand using theDT 46453  (1).

  3. Object Number: 1245860  Size: SH
  4. Remove the nut, washer and control lever.
  5. Using a screwdriver, unstake the lock washer.
  6. Remove the 2 bolts and nut and pull out the park/neutral position (PNP) switch.

  7. Object Number: 1245859  Size: SH
  8. Remove the 2 unions the transaxle case.
  9. Remove the 2 O-rings from the unions.

  10. Object Number: 1245865  Size: SH
  11. Remove the screw plug from the transaxle case.
  12. Remove the O-ring from the screw plug.

  13. Object Number: 1245863  Size: SH
  14. Remove the bolt and the input shaft speed (ISS) sensor.
  15. Remove the breather plug.
  16. Remove the O-ring from the breather plug.

  17. Object Number: 1245864  Size: SH
  18. Remove the bolt and the output shaft speed (OSS) sensor.

  19. Object Number: 1245862  Size: SH
  20. Remove the 18 bolts.
  21. Remove the oil pan and gasket.
  22. Remove the drain plug from the oil pan.

  23. Object Number: 1245866  Size: SH
  24. Remove the 3 bolts and oil strainer.

  25. Object Number: 1245867  Size: SH
  26. Remove the gasket from the oil strainer.

  27. Object Number: 1245869  Size: SH
  28. Remove the bolt and transmission fluid temperature sensor with the clamp.
  29. Disconnect the 5 solenoid connectors.
  30. • Lock-up control solenoid (5)
    • Pressure control solenoid (1)
    • No. 2 shift solenoid (2)
    • No. 1 shift solenoid (3)
    • Timing solenoid (4)

    Object Number: 1245868  Size: SH
  31. Support the valve body assembly and remove the 14 bolts.

  32. Object Number: 1245871  Size: SH
  33. Disconnect the manual valve control rod from the manual valve lever, then remove the valve body assembly.

  34. Object Number: 1245870  Size: SH
  35. Remove the check valve and spring.

  36. Object Number: 1245885  Size: SH
  37. Remove the brake drum gasket.

  38. Object Number: 1245857  Size: SH
  39. Remove the apply gasket.
  40. Notice: Refer to Compressed Air Should Not Exceed 98 kPa (14 psi) Notice in the Preface section.


    Object Number: 1245875  Size: SH

    Important: 

       • Air pressure may cause the pistons to jump out. When removing the piston, hold it in place with your hand using a waste cloth.
       • Take care not to splash automatic transaxle fluid (ATF) when air-blowing.

  41. Apply 392 kPa (57 psi) of compressed air to the oil hole (1) and remove the direct clutch accumulator piston and spring.
  42. Remove the spring.

  43. Object Number: 1245872  Size: SH
  44. Remove the 2 O-rings (1) from the direct clutch accumulator piston.
  45. Notice: Refer to Compressed Air Should Not Exceed 98 kPa (14 psi) Notice in the Preface section.


    Object Number: 1245874  Size: SH

    Important: 

       • Air pressure may cause the pistons to jump out. When removing the piston, hold it in place with your hand using a waste cloth.
       • Take care not to splash ATF when air-blowing.

  46. Apply 392 kPa (57 psi) of compressed air to the oil hole (1) and remove the forward clutch accumulator piston and spring.
  47. Remove the spring.

  48. Object Number: 1245873  Size: SH
  49. Remove the 2 O-rings (1) from the forward clutch accumulator piston.
  50. Notice: Refer to Compressed Air Should Not Exceed 98 kPa (14 psi) Notice in the Preface section.


    Object Number: 1245879  Size: SH

    Important: 

       • Air pressure may cause the pistons to jump out. When removing the piston, hold it in place with your hand using a waste cloth.
       • Take care not to splash ATF when air-blowing.

  51. Apply 392 kPa (57 psi) of compressed air to the oil hole (1) and remove the over drive (O/D) and 2nd brake clutch accumulator piston and spring.

  52. Object Number: 1245878  Size: SH
  53. Remove the 2 O-rings (1) from the O/D and 2nd brake accumulator piston.

  54. Object Number: 1245877  Size: SH
  55. Remove the bolt and the transaxle wire from the transaxle case.

  56. Object Number: 1245876  Size: SH
  57. Remove the O-ring (1) from the transaxle wire.

  58. Object Number: 1245883  Size: SH

    Important: Be careful not to drop the differential gear assembly when the transaxle housing is removed.

  59. Remove the 16 bolts and tap on the circumference of the transaxle housing with a plastic hammer to remove the transaxle housing from the transaxle case.

  60. Object Number: 1245882  Size: SH
  61. Using a dial indicator, measure the input shaft end play.
  62. Specification
    The end play is 0.3-0.9 mm (0.012-0.035 in).


    Object Number: 1245881  Size: SH
  63. Remove the 6 bolts and oil pump.

  64. Object Number: 1245884  Size: SH
  65. Remove the differential gear assembly from the transaxle case.

  66. Object Number: 1245899  Size: SH
  67. Remove the apply gasket.

  68. Object Number: 1245897  Size: SH
  69. Remove the direct clutch assembly from the transaxle case.

  70. Object Number: 1245896  Size: SH
  71. Remove the thrust needle roller bearing from the direct clutch assembly.

  72. Object Number: 1245895  Size: SH
  73. Remove the direct clutch hub, thrust needle roller bearing and thrust bearing race from the transaxle case.

  74. Object Number: 1245890  Size: SH
  75. Remove the counter driven gear assembly from the transaxle case.

  76. Object Number: 1245894  Size: SH
  77. Remove the 9 bolts and tap on the circumference of the transaxle rear cover with a plastic hammer to remove the transaxle rear cover from the transaxle case.

  78. Object Number: 1245893  Size: SH
  79. Remove the 4 apply gaskets.

  80. Object Number: 1245889  Size: SH
  81. Remove 2nd coast and O/D brake flange (1), 2 discs (2), and 2 plates (3) from the transaxle case.

  82. Object Number: 1245892  Size: SH
  83. Remove the thrust needle roller bearing and forward and reverse clutch assembly.

  84. Object Number: 1245888  Size: SH
  85. Remove the thrust needle roller bearing and thrust bearing race from the forward and reverse clutch assembly.

  86. Object Number: 1245886  Size: SH
  87. Remove the forward clutch hub from the transaxle case.

  88. Object Number: 1245905  Size: SH
  89. Remove the thrust bearing race and thrust needle roller bearing from the forward clutch hub.

  90. Object Number: 1245900  Size: SH
  91. Remove rear planetary sun gear and 1-way clutch assembly.

  92. Object Number: 1245903  Size: SH
  93. Remove the thrust bearing race from the rear planetary sun gear and 1-way clutch assembly.

  94. Object Number: 1245902  Size: SH
  95. Remove the thrust needle roller bearing and planetary carrier thrust washer from the rear planetary sun gear and 1-way clutch assembly.

  96. Object Number: 1245904  Size: SH
  97. Remove the 1-way clutch assembly and thrust washer from the rear planetary sun gear.

  98. Object Number: 1245907  Size: SH
  99. Remove the front planetary sun gear from the transaxle case.
  100. Remove the thrust bearing race from the front planetary sun gear.
  101. Notice: Refer to Compressed Air Should Not Exceed 98 kPa (14 psi) Notice in the Preface section.

    Notice: Refer to Transaxle Case Damage Notice in the Preface section.


    Object Number: 1245908  Size: SH
  102. Using the DT 46455  (1) and DT 46458  (2), remove the 2 snap rings, 2nd brake piston, and 2nd brake piston return spring.
  103. Notice: Refer to Compressed Air Should Not Exceed 98 kPa (14 psi) Notice in the Preface section.


    Object Number: 1245909  Size: SH

    Important: 

       • Air pressure may cause the pistons to jump out. When removing the piston, hold it in place with your hand using a waste cloth.
       • Take care not to splash ATF when air-blowing.

  104. Apply 392 kPa (57 psi) of compressed air to the 2nd brake to remove the 2nd brake piston from the 2nd brake clutch cylinder.

  105. Object Number: 1245910  Size: SH
  106. Remove the 2 O-rings (1) from the 2nd brake piston.

  107. Object Number: 1245911  Size: SH
  108. Remove the 2 plates, 2 discs, and flange.

  109. Object Number: 1245912  Size: SH
  110. Remove the No. 2 1-way clutch and planetary gear from the transaxle case.

  111. Object Number: 1245913  Size: SH
  112. Remove the No. 2 1-way clutch from the planetary gear and remove the anti-rattle clip.

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

  115. Object Number: 1245906  Size: SH

    Notice: Do not chisel and remove the planetary ring gear nut staking before removing the nut. Damage to the planetary ring gear could result if force is applied . Remove the nut without unstaking the planetary ring gear. If force is used to unstake the planetary ring gear nut, damage the bearing could result.

  116. Remove the planetary ring gear nut using planetary ring gear nut removal/installation socket DT 46472  (1).

  117. Object Number: 1245915  Size: SH
  118. Remove the 2 bolts and parking lock pawl bracket.

  119. Object Number: 1245916  Size: SH
  120. Remove the parking lock pawl shaft, torsion spring and parking lock pawl.

  121. Object Number: 1245917  Size: SH
  122. Remove the bolt and manual detent spring.

  123. Object Number: 1245918  Size: SH
  124. Using a chisel and hammer, unstake and remove the spacer.

  125. Object Number: 1245919  Size: SH
  126. Using a pin punch and hammer, drive out the pin.

  127. Object Number: 1245920  Size: SH
  128. Remove the manual valve lever shaft and manual valve lever.

  129. Object Number: 1245921  Size: SH
  130. Remove the parking lock rod from the manual valve lever.

  131. Object Number: 1245927  Size: SH
  132. Using a screwdriver, remove the oil seal.

  133. Object Number: 1245938  Size: SH

    Caution: Use extreme care when removing snap rings. Always wear adequate eye protection in order to avoid personal injury.

  134. Using the DT 46455  (1) and DT 46457  (2), remove the snap ring of 1st and reverse brake.

  135. Object Number: 1245929  Size: SH
  136. Remove the flange, 4 discs, 4 plates, and return spring.

  137. Object Number: 1245922  Size: SH
  138. Using the DT 46455  (2),DT 46457  (3), and DT 46459  (1), remove the planetary ring gear.

  139. Object Number: 1245932  Size: SH
  140. Install the 3 bolts to the counter drive gear.
  141. Specification

        • The bolt (M6) L is equal to 40-80 mm (1.57-3.15 in).
        • The bolt (M6) pitch is equal to 1.0 mm (0.04 in).
  142. Rotate 3 bolts in order and remove the counter drive gear and planetary ring gear.
  143. Notice: Refer to Compressed Air Should Not Exceed 98 kPa (14 psi) Notice in the Preface section.


    Object Number: 1245923  Size: SH

    Important: 

       • Air pressure may cause the pistons to jump out. When removing the piston, hold it in place with your hand using a waste cloth.
       • Take care not to splash ATF when air-blowing.

  144. Apply 392 kPa (57 psi) of compressed air to the transaxle case to remove the 1st and reverse brake piston.

  145. Object Number: 1245934  Size: SH
  146. Remove the 2 O-rings (1) from the 1st and reverse brake piston.

  147. Object Number: 1245939  Size: SH
  148. Remove the bolt and No. 1 transaxle case plate from the transaxle case.

  149. Object Number: 1245930  Size: SH
  150. Using a suitable puller, remove the counter driven gear outer tapered roller bearing race and shim from the transaxle case.
  151. Notice: Refer to Brake Piston Is Lowered Notice in the Preface section.

  152. Using a driver, remove the oil seal from the transaxle case.

  153. Object Number: 1245925  Size: SH
  154. Using the DT 46463  (2) and DT 46465  (1), remove the transaxle case side bearing outer race and shim.

  155. Object Number: 1245935  Size: SH
  156. Remove the 3 bolts and oil reservoir lock plate from the transaxle housing.

  157. Object Number: 1245940  Size: SH
  158. Remove the bolt and No. 1 transaxle apply pipe clamp from the transaxle housing.
  159. Remove the transaxle lube apply pipe and differential gear lube apply pipe from the transaxle housing.

  160. Object Number: 1245931  Size: SH
  161. Using a suitable puller, remove the counter driven gear outer tapered roller bearing race from the transaxle housing.
  162. Notice: Refer to Brake Piston Is Lowered Notice in the Preface section.

  163. Using a driver, remove the oil seal from the transaxle housing.

  164. Object Number: 1245926  Size: SH
  165. Using a suitable puller, remove the side bearing outer race from the transaxle housing.
  166. Notice: Refer to Transaxle Case Damage Notice in the Preface section.


    Object Number: 1245936  Size: SH

    Caution: Use extreme care when removing snap rings. Always wear adequate eye protection in order to avoid personal injury.

  167. Using the DT 46451  (1), DT 46454  (2) and a driver, remove the snap ring.

  168. Object Number: 1245941  Size: SH
  169. Remove the O/D brake return spring.
  170. Notice: Refer to Compressed Air Should Not Exceed 98 kPa (14 psi) Notice in the Preface section.


    Object Number: 1245943  Size: SH

    Important: 

       • Air pressure may cause the pistons to jump out. When removing the piston, hold it in place with your hand using a waste cloth.
       • Take care not to splash ATF when air-blowing.

  171. Apply 392 kPa (57 psi) of compressed air to the transaxle rear cover to remove the O/D brake piston.

  172. Object Number: 1245947  Size: SH
  173. Remove the 2 O-rings (1) from the O/D brake piston.

  174. Object Number: 1245946  Size: SH

    Important: Do not expand the seal ring excessively.

  175. Remove the 2 seal rings from the transaxle rear cover.

  176. Object Number: 1245944  Size: SH
  177. Remove the 4 screw plugs and 4 O-rings from the transaxle rear cover.