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09-19-2018 #1Registered User
- Join Date
- Nov 2010
- Posts
- 44
FAB9 rear end with Strange 3rd member : car seems heavier when backing up in reverse.
I got a '71 Firebird with a full suspension kit from Chassisworks, the rear end is a FAB9 housing with Strange 3rd member using OEM FoMoCo 3.60 gears. The rear is setup fine and quiet, except that I feel its heavier when going into reverse!, even when the car is on jack stands and I try to rotate the wheels by hand its much easier to rotate in forward!, I replaced the gears, bearings, tried different pinion shims with no success. Is it normal for a 9 in rear to act like that?. Its harder to the point that sometimes the engine would stall if I don't slip the clutch enough. Let me know what do you think before I throw away the 9 in and return back to the old trusty GM 10 bolts!