Th350 4x4 transmission swap for Th400 4x4 on a 1975 Chevy Silverado?

felipe

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I have a 1975 Chevy Silverado 4x4, and i took out the 350 transmission and would like to put in a 400 i have the 400 with the transfer case that i took off of a 1973 chevy suburban... what do i need to modify? or is it just a straight bolt up and run?
And they are both automatic.. idk if that helps .
and i got everything i could from the transmission, Whats the kik down? and i have the bracket that goes accross from one side of the frame to the other attatched to the tranny.
 
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