Rebuilt 904. Whirring. Dead?

BRONZEBEE said

If it makes an noise when you push it,i think you may have a problem with the roller sprag on the rear.Jack the rear up and take it out of park the spin the drive shaft clockwise then counter clockwise there should be resistance in one direction.:blob:

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Could be the springs and rollers weren't put back in there right or something?? If the noise is indeed coming from the back of the trans. After 65 or 66 they did away with the rear pump in the torqueflite, so that's the only culprit that I could think of as well.
If it's coming from the front....prob the front pump gears were really worn and not replaced and chattering/vibrating in the housing.
Hopefully it's found out quick for you....good luck!!

Oh, i agree...727/904 easiest as they come!