Fleetwood V8-252 4.1L VIN 8 FI (1983)
Torque Converter: Technical Service Bulletins
A/T - High Pitched Whine Noise
Bulletin No. T 84-1
File In Group 7
Number
85
Date
Sept. '83
HIGH PITCHED WHINE NOISE - THM 200-4R (DEVILLE AND BROUGHAM)
Some 1983 Deville and Brougham vehicles equipped with THM 200-4R transmissions may experience a noise condition during vehicle operation from a
standing start that sounds like a high pitched whine. This noise condition may be coming from the front internal gear assembly of the compound
planetary gearset, the torque converter or the hydraulic pump.
In diagnosing this condition, if the noise is noticeable in DRIVE with the brake applied, the vehicle stationary and the engine at approximately 1500
RPM, the cause could be a torque converter bearing noise or an oil pump cavitation noise. Use service procedures for checking torque converter end play
in Section 7A of the 1983 Service Information Manual to isolate if the torque converter or oil pump is the cause of the condition.
If the whine noise is only noticeable when driving the car in first, second or reverse gear ranges, the most likely cause would be mismachined teeth on the
front internal gear. When servicing any 1983 THM 200-4R transmission for this whine type noise condition and the cause has been diagnosed to be the
front internal gear, replace it with P/N 8630909.
For warranty purposes, use Labor Operation Number K7250 at 4.0 hours to replace the front internal gear.
