I used Amsoil (synthetic) and one bottle of Ford Friction Modifier in my rear-end that I just finished up a few weeks ago. I upgraded my 8.8 with an Auburn Pro unit, Moser 31 spline C-clip axles, 3.73 ring and pinion, T/A performance girdle/cover with ARP stud kit.
No problems here.
Happy motoring.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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