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Rear noise

524 Views 1 Reply 1 Participant Last post by  MxMeac
I have a 1989 pickup 4cyl 4 speed manual with 252,xxx miles
I have a whirling type noise during deceleration at anything over 40 mph when letting off the throttle.
Any ideas?
Should I try changing the rear diff oil?
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Is my rear 7.5 or 8?
Rebuild? If so any parts I’ll need that don’t come in kits?
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