Hummer H3. Manual — part 1517

Fig. 194: View Of 1st/2nd Gear Synchronizer Hub Insert
Courtesy of GENERAL MOTORS CORP.

1. Install the synchronizer spring in the hole of a new 3rd/4th gear synchronizer hub.

2. Slide the insert in while pushing down on the spring.

IMPORTANT: The 3rd/4th gear synchronizer hub cannot be used again after

removal. Always install a new hub.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 195: Identifying 3rd/4th Synchronizer Sleeve
Courtesy of GENERAL MOTORS CORP.

3. Install the 3rd/4th synchronizer sleeve on the hub while pushing in the inserts.

The shoulder of the sleeve with the step goes forward, 4th gear side.

The smooth side of the hub, without the indents for synchronizer tabs, is the 4th gear
side.

Align the inserts with the non-tooth areas of the sleeve.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 196: Locating 3rd/4th Gear Synchronizer Hub Components
Courtesy of GENERAL MOTORS CORP.

4. Install the following components to the 3rd/4th gear synchronizer hub (235):

1. The 3rd gear outer blocking ring (236)

Ensure the tabs align in the hub.

2. The 3rd gear internal blocking ring (237)

3. The 3rd gear inner blocking ring (238)

Ensure the tabs align in the hub

The 4th gear blocking ring is installed with the input gear.

1st/2nd Gear Synchronizer

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3

Fig. 197: View Of 1st/2nd Gear Synchronizer Hub Insert
Courtesy of GENERAL MOTORS CORP.

1. Install the synchronizer spring in the hole of the 1st/2nd gear synchronizer hub.

2. Slide the insert in while pushing down on the spring.

2007 Hummer H3

2007 TRANSMISSION Manual Transmission - Aisin AR5 - H3