I just got a set of FRPP 3.73 gears put in my 86 mustang this last weekend. i got it back and drove it. i now have a loud whining noise when im on the gas a little but mostly when im off the gas. the guy who did them just put a set of 4.10 richmond gears in my buddies 01 mustabg gt the night before and he also put a set of 3.55 FRPP gears in by buddies 88 gt a few nights earlier and theirs came out fine.. i dont know what to do. he said he tried everything. anyone with any ideas would help. thanks