Axle Swap Questions

[Brningdawn]

I have a 1992 GMC K1500. 5.7 with 700r4, 10 bolt rear, 3.42 gears. All stock. This is my project truck, but I've never done this before. I've been trying to figure it all out.

I am planning to either beef up the 350 a bunch or I'm going to drop in a lq4 motor with a new transmission. I know all the extra power over will wipe out my rear end and I want different gears anyway.

The local pullapart has a 1989 Chevy K2500. It has a 5.7 as well. I believe a TH400 transmission. What I am after is the axles, both from and back. I've been doing a lot of searching, but I just want to make sure. The truck has a 14 bolt, and I assume semi float, rear end. I'm also assuming it has at least 3.73 gears given that it's a 3/4 ton. It's also a 3/4 ton with 6 lug, not 8. Based on what I've read it should be a straight swap. Can anyone confirm this?

My truck is a short bed and the donor is long bed. If the rear axle will swap right in, do I need to grab the leaf springs with it?

On the front, will it bolt up with my existing front end? Can I just disconnect the mounts and unbolt the cv half shaft or do I need it all? What about control arms and stuff like that? I'm not sure what front it has, but I know that the gears will match the back so that's I'm really concerned with.

Should I pull the TH400 with it since it's only $75 extra dollars? Drive shaft? Mounts? Etc?

[b454rat]

See if I can answer this lol...First, the stock rear will be fine. Its the same rear they put in chevells and Camaros back in the day with big blocks drag racing and they held up. Shoot the 7.5 rear held up in my Malibu with a 454 4-speed. it will be fine. It wouldn't run the 14sf, they break sitting the driveway. But I think what goes in them is the carrier, not sure what or why, I personally don't like them. I've ran them and haven't had any problems, but for some unknown reason, I just don't like them lol. If the donor truck is a 6 lug 2500, and turbo 400 trans, it's probly 3.42s same as yours. Most of the gears in those 2500 or 1500s with the 14sf are 3.42s. Defeats the purpose of a heavier truck with the same lame gears...Don't bother with the leafs, will just ride rougher if any difference. But it would be a bolt in, front and rear.