Hummer H3. Manual — part 1535

47. Using a hydraulic press and J 39924-2 or equivalent, install the 5th synchronizer gear. See

Special Tools.

48. Inspect the 5th/reverse synchronizer assembly for proper installation. The blocking rings

should move freely back and forth. If the blocking rings do not move, the rings came out of
the lock position. Disassembly is required. Assemble again properly.

Fig. 262: Measuring Axial Clearance On 5th Gear & Thrust Washer

IMPORTANT: Support the front of the countershaft on a press plate. Ensure

that the tabs on the blocking ring align in the gear holes. Do
not rotate the blocking rings for aligning.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Courtesy of GENERAL MOTORS CORP.

49. Using a feeler gage between the 5th gear and the thrust washer, measure the axial clearance.

Specification:

Standard Clearance: 0.10-0.35 mm (0.0039-0.0138 in)

Maximum Clearance: 0.40 mm (0.0157 in)

50. If the clearance exceeds the maximum, ensure the 5th synchronizer gear is installed

completely.

51. If the clearance exceeds the maximum, inspect the 5th countershaft gear, the countershaft or

the thrust washer for wear.

52. If clearance is lower than the standard clearance, inspect the 5th countershaft gear, the

countershaft or the 5th synchronizer gear for burrs.

53. Repair or replace the damaged or worn component.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 263: Identifying 5th Synchronizer Gear Retaining Ring
Courtesy of GENERAL MOTORS CORP.

54. Select the maximum thickness retaining ring for the 5th gear, that will fit. Refer to Fifth

Gear Retaining Ring Specifications.

55. Install the 5th synchronizer gear retaining ring.

IMPORTANT: The retaining ring is a select fit. Always install a NEW

retaining ring.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 264: View Of Transmission Magnet
Courtesy of GENERAL MOTORS CORP.

56. Install the magnet.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3