6000 V6-173 2.8L (1988)
Output Shaft: Technical Service Bulletins
A/T - New Final Drive/Output Shaft/Sun Gear Shaft
Bulletin Number:
88-7-37
Reference Number:
877132
Publish Date:
7/88
Subject:
NEW FINAL DRIVE ASSEMBLY; OUTPUT SHAFT; AND FINAL DRIVE SUN GEAR SHAFT
Models
Affected:
1988 6000, BONNEVILLE AND GRAND PRIX WITH 440T4 TRANSMISSION
FIGURE 2
BULLETIN COVERS:
A new final drive assembly (679), output shaft (565) and final drive sun gear shaft (669) for some 1988 6000, Bonneville, and Grand Prix models
equipped with a THM 440-T4 transaxle.. The new final drive assembly (679) has larger differential side gears (688) and larger differential pinion gears
(686) (refer to Figure 2). To accommodate the larger gears, the output shaft (565) was lengthened by .73 mm (.029"). The final drive sun gear shaft (669)
was also changed by adding two additional lube holes for increased lubrication to the final drive.
FIGURE 1 - THM 440-T4 TRANSAXLE IDENTIFICATION INFORMATION