A/T - Gear Whine In First and Second Gear
87cad6Bulletin No. T 88-11
File in Group 7
Number 171
Corp. Ref. No. 717107
Date Sept. '87
SUBJECT: GEAR WHINE IN FIRST GEAR
MODELS AFFECTED: 1982-1987 RWD DE VILLES AND BROUGHAMS
Some Cadillacs equipped with a THM 200-4R transmission may experience a gear whine in first gear, which may also be evident in second gear. This condition may be the result of excessive forward clutch shaft and output shaft end play causing a wear pattern on the front planetary gears.
To repair this condition, replace the front internal gear, front carrier assembly, and front sun gear. The appropriate part numbers are listed below:
Front Internal Gear: P/N 8639947
Front Carrier Assembly: P/N 8628174
Front Sun Gear: P/N 8628190
Revised end play specifications have been developed for the forward clutch shaft and the output shaft to prevent recurrence of gear whine. Refer to the following end play specifications when replacing noisy front planetary gears:
Forward Clutch Shaft .9 - 1.3 mm (.036" - .051")
Output Shaft .32 - .65 mm (.012" - .026")
Refer to the appropriate Service Information Manual 200-4R section for proper overhaul and end play checking procedures.
For warranty purposes, use Labor Operation K7250 at 3.7 hours.