ok i'm wanting to swap out my th700R-4 / np241 combo in my 90 chevy for the th400 / np203 combo that i've got in my 79 3/4ton gmc doner truck.....i'm doing an SAS so the output of the 203 being passenger side isnt a problem because i'm using the axles out of the same truck....any input on how/if i can do this would be nice...i know i'll need a custom crossmember that isnt a problem....i just need to know if the 400 will bolt up and what about the kickdown cable and that sorta thing

The 400 doesn't have a cable, it is an electric kickdown and requires a vacuum line, otherwise is is a bolt up as long as you are willing to redo everything to make it fit--------------- that is exaust, shifters, x-members, speedo, etc.