Thinking of swapping axles in my M-37. Looked at an '89 dodge 3/4 ton today. I'm guessing back is a 60 and front is 44 but not sure. Have the vin but not sure that will say. It's a small block auto trans. My question is it looks like the front axle has a vacuum disconnect. Would dodge have them in this year? Whats funny is the axle has manual hubs? I thought you had one or the other? Or would this be something someone added?

If it is a disconnect would i still want it? Not looking to do anything crazy with the truck, mainly looking for gearing and brakes and better choice of tire.

Also it looked like a throttle body injected engine. Couldn't see a vac can on distributor either. Guessing it's computer controlled. How easy is it to keep fuel injection? Would definitely switch to a manual. Would that be a new comp also? Or swap to carb and new dist? My old m had a 318 carbed i swapped in and ran well but that was years ago.