Could be alot of things. If you are sure it is coming from the tranny and you suspect the diff is making the noise then it might be bad diff bearings or incorrect shims.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.