Making 2x4 to 4x4

[tdom]

I have a 91 crew cab 1 ton two wheel drive, and a 1/2 ton suburban 4x4 can I switch them to make the crew cab a 4x4?

 

[b454rat]

You should be able to use the mounts for the front springs, and the engine crossmember.

Best way for the rear, depending how much lift, to run a block. If you need more than that, go with a shackle flip and some lift springs.

Not sure about the tranny crossmember, if there is a difference between 1/2t and 1 ton stuff.

Kinda weird, I'm doing the same to my crew...