TRX 300 axle

Hi men, a quick question or two if I may. The 4wd 300 (or most of one) I acquired that’s in excellent condition apart from a busted rear diff casing is due to be started on shortly. I managed to buy a 2wd TRX300 with all the bits I need (engine smokes but don’t need that) including a good rear axle. Will the 2wd axle fit the 4wd 300 straight on (ratio’s etc) or will I need to just use the diff case.

What’s the set up with removing / fitting a rear axle. I do have a down load manual but you can’t beat an experienced guy running through it for you. Manuals don’t give you experience.

Cheers men.