I have never done that swap, but I'm pretty sure, that they are the same, except the axle shafts, and by that, mean the bolt pattern. If they are both, 10 bolt, 8.5 ring gear, and 30 spline shafts, ( or is it 32 spline,,,no, 30, I think) they are the same, and will swap. If you change gear ratio, then you have to do both ring, and pinion. That means pinion preload. Get a crush sleeve eliminator kit. Your going to have to get an install kit anyway. And while your in there, may as well replace all of the bearings, and seals. I think the axle housings are the same, and if the splines are the same count, then you can just swap axle shafts. That easy. Spend some time on YouTube. That's what I did, when I rebuilt mine, in my 97 C1500. I installed an Eaton trutrack, and a set of 373 gears. With the OE hight tires I run. ( 275/60/15) the 373s are a good choice for me. I replaced and of my bearings and seals, also cost me $1100. That was a year and a half ago. But, I have a new rear end now, with limited slip and 373. Everything is new.
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