C-6 to Np435 in a '79 Bronco

[DJOHNSTON78]

wondering if any one knows if i have to change the crossmember out when going from a c-6 to a np435

[Ford_Six]

Going the other way I didn't have to change mine out. If the transmission lengths are different, you should be able to move the crossmember.

[76 F-150 390FE]

doin the same in a 76 pick up and was wondering if you have to get the drive shafts from a 4spd truck or do the ones from a C6 work, im pretty sure between the C6 and the 435 in the 80s trucks it was the same drive shaft im just makeing sure.