TH350 to TH400 swap - whats needed?

[demian5]

Hey Im sure this has been beat to death. I currently have a short shaft 350 in my long bed. I need a trans rebuild and have a short shaft 400 in the garage I could get rebuilt and get the parts together for a swap. I just blew up the motor and plan on a different motor with added HP. 350 is great cause it doesn't take as much power as the 400 to turn, but the 400 would be pretty bulletrpoof.

What do I need for the swap? The truck is currently a column shift and id like to keep it that way. I know Ill need to put the kickdown switch on the pedal assembly.

What else?
New front driveshaft?
Shift linkage? - Can I just move mounting in the frame?
Cross member?
Flex plate? (I wouldn't think so)
Dipstick?

Thanks!