Wow Moses. Thanks for the in depth answer. I have a FC170 that I am restoring, and Im trying to keep it correct in outward appearance with some upgrades to the driveline. when I got the truck it did not have any driveline. So I have installed a AMC 360 and th400/dana 20. One mistake was that the amc engine's oil pump sits directly over the front axle differential. So I had to raise the Jeep for clearance. If I do it over again, Ill install a 4.6L inline 6 for clearance. One drawback to the truck is the ride - - on rough roads or concrete freeways it rides like the proverbial lumber wagon. Possibly I could make a elastic spring shackle fit the rear to improve this somewhat. But like you said above, there are certain things you just have to put up with to keep the truck's character.