GM Service Manual Online
For 1990-2009 cars only

1st/2nd, 3rd/4th Shift Rail Assembly

Tools Required

J 36850 Transjel Lubricant


    Object Number: 401984  Size: SH
  1. Install the selector pin (3) on the shift shaft (4).
  2. Align the roll pin hole on the selector pin (4) with the roll pin hole on the shift shaft (2).
  3. Install the roll pin (5) through the selector pin (3) and the shift shaft (1).

  4. Object Number: 401986  Size: SH
  5. Install the interlocking plate (2) on the selector pin (1).

  6. Object Number: 401987  Size: SH
  7. Install the shift link (1) in the 3rd/4th shift fork (2).

  8. Object Number: 401992  Size: SH
  9. Install the 3rd/4th shift fork (2) on the shift shaft (1).

  10. Object Number: 401993  Size: SH
  11. Align the notch on the shift link (2) with the selector roll pin (1).

  12. Object Number: 401995  Size: SH
  13. Install the shift link (2) with the 1st/2nd shift fork (1).

  14. Object Number: 401996  Size: SH
  15. Install the 1st/2nd shift fork (1) on the shift shaft (2).

  16. Object Number: 401999  Size: SH
  17. Install the 1st/2nd shift shaft link (1) on top of the 3rd/4th shift shaft link (3) on the interlocking plate and the selector roll pin assembly (2).

  18. Object Number: 402000  Size: SH

    Important: The neutral return cam pin fits loosely in the shift shaft. Use the J 36850 to hold the neutral return cam pin in place.

  19. Install the neutral return cam pin (3) in the neutral return can pin hole (1) on the shift shaft (2).

5th/6th, Reverse Shift Rail Assembly

Tools Required

J 39437 Bushing Installer


    Object Number: 402004  Size: SH
  1. Install the 5th/6th shift shaft lever bushings (1) and (3) in the 5th/6th shift lever (2) using the J 39437 and a hammer.

  2. Object Number: 402007  Size: SH
  3. Install the retainer ring (1) on the 5th/6th shift lever (2).

  4. Object Number: 402009  Size: SH
  5. Install the 5th/6th shift lever (2) on the shift shaft (1).

  6. Object Number: 402012  Size: SH
  7. Install the reverse shift lever (2) on the shift shaft (1).

  8. Object Number: 402013  Size: SH
  9. Install the reverse lever roll pin (3).
  10. Install the reverse collar (2).
  11. Install the reverse collar roll pin  (1).