What type transfer case is in my 76 ford f100
4x4? Is is a gear driven or chain. and is
it a strong case. Will an NP205 or 203 bolt in
its place? To 4 speed w/ granny transmission.

 

 

i have a '75 short box 4x4 300-6 4-speed the transfer case is a dana model 21, a chiltons manual diagram looked like it was gear driven, all i know right now iam currently still rebuilding my truck

 

Your transfer case is a Dana 21. It is gear driven. You can swap an early Bronco 2 speed Dana 20 transfer case very easily. If you want to swap to a 203 or 205, I would pick the 205 with a 4 speed to make the swap easy. Your existing 4 speed would need to have the output shaft changed in it to accomodate 205 anyways.