GM Service Manual Online
For 1990-2009 cars only

1st/2nd Gear Synchronizer


    Object Number: 880952  Size: SH

    Important: When servicing the synchronizers, retain them in the same order that they are removed. Keep the synchronizer components together and mark them to identify correct location.

  1. Remove the following components from the 1st/2nd gear synchronizer hub (215):
  2. • The 2nd gear inner blocking ring (228)
    • The 2nd gear internal blocking ring (227)
    • The 2nd gear outer blocking ring (226)
    • The 1st gear outer blocking ring (216)
    • The 1st gear internal blocking ring (217)
    • The 1st gear inner blocking ring (218)

    Object Number: 880953  Size: SH
  3. Remove the reverse gear from the 1st/2nd gear synchronizer hub.

  4. Object Number: 880954  Size: SH
  5. Remove the synchronizer insert and spring from the synchronizer hub. Push in on the spring and slide the insert out.

3rd/4th Gear Synchronizer


    Object Number: 880955  Size: SH
  1. Remove the following components from the 3rd/4th gear synchronizer hub (235):
  2. • The 3rd gear outer blocking ring (236)
    • The 3rd gear internal blocking ring (237)
    • The 3rd gear inner blocking ring (238)
    • The 4th gear blocking ring was removed with the input shaft.

    Object Number: 880957  Size: SH
  3. Remove the 3rd/4th gear synchronizer sleeve from the 3rd/4th synchronizer hub.

  4. Object Number: 881231  Size: SH
  5. Remove the synchronizer insert and spring from the synchronizer hub. Push in on the spring and slide the insert out.

Reverse/5th Gear Synchronizer


Object Number: 1526798  Size: SH

Remove the following components from the 5th/reverse countershaft gear (450):

    • The 5th/reverse gear synchronizer spring retainer (256)
    • The 5th/reverse gear synchronizer spring (249)
    • The 5th gear synchronizer spring (248)
    • The 5th gear synchronizer insert (247)
    • The 5th/reverse synchronizer sleeve (254)