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i have been doing a lot of reading here and there. i think my 1976 Feather Duster has a A904 trans in it(3spd auto). im wanting a OD trans for when i pep up the engine so that i can still maintain a fairly high MPG. the Rear end is a 7-1/4, with what i believe are 2.76 or 2.73 rear-end gears...