Front differential swap on a k1500?

[LynnJr]

My 1/2 ton k1500 came with a 10 bolt rear-end and the small front end.
I am going to put a 12 bolt rear-end in it out of a 3/4 ton k2500 so I can lock the rear-end up for off highway use.
My front differential can't be locked and I don't know if a k2500 front will fit.
Anybody swapped this out?
I can get lockers for the k2500 front and rear I just need to know if it will fit?
And by fit I mean without modification