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putting a 904 together for a drag car, 400-450hp application. 5 clutch direct drum and matching pump. thick frictions w/ .015 per friction. forward clutch has .040 clearance. .062 washer between pump and direct and .062 washer between direct and forward. .060 washer between input and output...

Building a 5.9 mag with an s475, will have a 904 trans, 3.08 or 3.31 rear gear ( have both available) 28" tall tire, around 3000lb car. My question is would i be better off with the 2.74 or the 2.45 1st gear set? Looking at loading the turbo vs. getting the car out the hole. Thanks

I have searched and nobody seems to have a good way of telling which gear set is in an existing transmission. I bought a used 904 that someone has been into so the casing numbers dont do me any good. I have the trans apart on the table and want to know if anybody has measurement or side by...

I have been doing some research into what trans i want to run and i was looking to go with a 904 for the weight and parasitic loss factors. I then read some info about the a998 and a999 transmissions, mainly about the extra apply clutches and wider band, and also the gearing for 1st and second...