I did quite a bit of searching but could not find anything. I believe my problem lies with the terms used. I just purchased a 1976 Chevrolet 1/2ton 4X4 truck. 12 bolt rear, Dana 44 front, full time 4 wheel drive. I have a couple of questions if someone has the time. Am I correct in assuming that the transfer case is an NP203 since it is a full time unit? With this full time setup, how do the front hubs come into play? Are these actually locked at all times, and the transfer case actually locks and unlocks the front axle? Without considering mileage concerns, could this setup be reliable after being rebuilt? I don't plan to change the full time setup since it fill fit my needs as it is, as long as it is strong and reliable. Was there a factory option for PosiTrac on this truck? It seems both front and rear axles have some sort of PosiTrac unit, I just thought I'd ask before I get to the point of rebuilding the axles. Thanks for your time!