Toronado V6-3800 3.8L (1988)
Output Shaft: Technical Service Bulletins
A/T - New Final Drive Assembly/Output Shaft/Sun Gear
SUBJECT:
NEW FINAL DRIVE ASSEMBLY; OUTPUT SHAFT; AND FINAL DRIVE SUN GEAR SHAFT
1988 CUTLASS CIERA, CUTLASS SUPREME, DELTA 88, NINETY-EIGHT AND TORONADO
MODELS/YEARS:
MODELS EQUIPPED WITH THM 440-T4
TRANSAXLE (RPO - ME9)
NUMBER:
88-T-91
CORP. REF. NO.: 877132
DATE:
July 1988
SECTION:
7A
BULLETIN COVERS:
A new final drive assembly (679), output shaft (565) and final drive sun gear shaft (669) for some 1988 vehicles 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
DATE OF PRODUCTION CHANGE:
April 6, 1988 (Julian Date 097) for all THM 440-T4 transaxles using a 3.33 ratio final drive assembly; May 5, 1988 (Julian Date 126) for all THM
440-T4 transaxles using a 3.06 ratio final drive assembly, and June 10, 1988 (Julian Date 162) for all models using the 2.84 ratio final drive assembly.
During May, 1988 the transaxle I.D. nameplate was also changed to provide for easier model identification (refer to Figure 1). The changes to the
nameplate were:
-
Larger letters designating the transaxle model
-
Eliminated the "8" (designating 1988 model year) and "H" (designating THM 440-T4) on right hand side of tag.
SERVICE ACTION:
When servicing a 1988 THM 440-T4 transaxle use the parts listed in the service parts information section below. Do not attempt to mix these three
components with parts that look similar or the following misbuilds will occur:
^
Excessive clearance between the end of the output shaft and the differential pinion shaft if the new output shaft is assembled with the previous final
drive assembly.
^
The output shaft snap ring cannot be installed if the new final drive assembly is assembled with the previous output shaft.
