New Member 68 SB 4x4

[Outbackfarmer]

I just became a member here. I have been doing some searching on the site, great information! I just purchased a 1968 factory short bed fleetside 4x4. It is a nice body frame and good running 350. The transmission has issues and is going to need a rebuild. I have big plans for it, a ls swap, paint, interior. Basically a complete makeover. I figured out after a short drive, the fist thing is to get disc brakes. After a little research on here, I found it is not just a simple kit install, rather an axle swap. So that is the first order of business. Got to get this thing where I can stop it. So what I am thinking is find an 4x4 suburban, as they are available and cheap in my area. I think that the 71-87 axles are a direct bolt up swap, but wanted to confirm that these year models and the suburban axles would work. Also the 88-91 were the same body style, are the axles off these year models not interchangeable?
I will see how to post pics and get one up shortly.