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Well its a long shot but since you said the sound comes from the rear, you can check the drive shaft coupler that mates to the trans through an inspection port on the trans bellhousing. The allen head bolts should be secure and the coupler should be centered between the drive shaft splines and the trans input shaft splines.
Does it make the sound while under load (taking off from a stop sign for instance) or when stationary? With the car idling in neutral? What about with the car turned off?
Knowing these details will help narrow down the source.
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Tyler from Wisconsin, 1989 944 S2 on Megasquirt PNP
Last edited by walfreyydo; 05-23-2022 at 06:18 AM..
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