A/T - AOD High Pitched Noise In All Ranges

TSB 87-38 (June)

SUBJECT: FORD AOD

PROBLEM:
High Pitched Noise in all Ranges. The noise becomes louder as the engine RPM increases.

POSSIBLE CAUSE:




Checking for location of noise with stethoscope will help verify if the noise is coming from the front or the rear of the transmission. It may be a bad bearing on either side of the direct drum (# 7 and # 8 Thrust Bearings).

When checking the thrust bearings on the front and rear of the direct drum, be sure the output shaft hub is smooth where the # 8 thrust bearing rides against it.

Always pay close attention to transmission end play on re-assembly. Many thrust bearing failures are due to improper end play.