1980 camaro i put a373 gear in it now i have a whining nosie what did i do wrong?

I agree with Kenneth. Take apart and reset everything. Cheaper now than later.
 
It sounds like you didn't set the gear mesh properly. You can't just slap new gears in; you have to replace the crush sleeve behind the pinion gear, then torque the pinion gear and shim the carrier properly to get the right mesh between the gears.
 
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