Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
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.
^
Insufficient lubrication to the final drive assembly if the previous final drive sun gear shaft is assembled with the new output shaft and final drive
assembly.
SERVICE PARTS INFORMATION
Part No
Description
8661905
Package, Final Drive (3.06 final drive ratio)
8662922
Package, Final Drive (3.33 final drive ratio)
8662923
Package, Final Drive (2.84 final drive ratio)
8661089
Shaft, Output
8661020
Shaft, Final Drive Sun Gear
SERVICE MANUAL REFERENCE
Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair section in the appropriate Service Manual.
