w/ the 64 your best bet will to hunt for a stock 3.07 rear and switch'em - can't do that w/ the TF series cuz they never had but 3.90 and 4.11 - rebuilding yours to whatever other ratio will cost 4x more - the gear set I'm lookin at costs about 600 new, like Patricks, who sell the gears for ADs and TF, but there's a 'rear-ends only' place here that has'em - that's why the 1st choice right now is the OD 3spd, which are scarce, but also available for your series - I happen to have 'inherited' 2 of'em
Bill
