GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Colorado Pickup - 4WD 🢒 Transmission/Transaxle 🢒 Manual Transmission - Aisin AR5 🢒 Synchronizers Disassemble

1st/2nd Gear Synchronizer

    Object Number: 880952 Size: SH

    Important: When you service 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
  2. Remove the reverse gear from the 1st/2nd gear synchronizer hub.

    3. Object Number: 880954 Size: SH
  3. 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
  2. Remove the 3rd/4th gear synchronizer sleeve from the 3rd/4th synchronizer hub.

    3. Object Number: 881231 Size: SH
  3. 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: 880959 Size: SH
  1. Remove the 5th/reverse gear synchronizer ring assembly from the sleeve (254).

    2. Object Number: 881229 Size: SH
  2. Remove the reverse synchronizer rings from the 5th synchronizer ring by rotating the reverse inner ring.

    3. Object Number: 881075 Size: SH
  3. Remove the 5th gear blocking ring (256) and the reverse/5th gear internal blocking ring (277) from the reverse/5th gear inner blocking ring (278). Turn the inner ring to align the tabs with the slots in the internal ring.

    4. Object Number: 881078 Size: SH
  4. Remove the inserts and springs from the reverse gear outer blocking ring. Push in on the insert and slide it out.