Does anyone know about this bulletin below that i got from main page??? i have this going on and it drives me nuts! how will this condition affect the trans if not repaired? and the new pressure regulator valve is inside the tranny right? so it would need to be dropped for this repair?


Grinding Noises at Low RPMs
dave8412 Jun 16 2006 - 1:15pm
Q: What's that buzzing/grinding noise at low RPMs?
A: It could be related to this technical service bulletin:
Bulletin #: 277142
Publish Date: 10/92
Models: 1984-1993 Firebirds w/ Hydra-matric 4L60/700R4 Trannys
Condition: buzzing noise from tranny at idle (more so when in reverse)
Cause: pressure regulator valve oscillating due to oil pressure instability at lower idle RPM
Correction: a new pressure reg. valve has been made to improve oil pressure stability at lower RPM (part #8684048)