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Tranny/Drivetrain/Rearend Q: Whats that buzzing/grinding noise at low RPMs?

April 26, 2017buzzing drivetrain grinding low noise rearend RPMs tranny

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Tranny/Drivetrain/Rearend Q: Whats that buzzing/grinding noise at low RPMs?

1 Answer

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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.