Nothing from a 92 will "bolt right up". The spring seats are wider on the rear end and the front is independent suspension, not a solid axle. Honestly... go find a complete square body truck or just a rolling frame. Anything from 73-87 will work... as long as it is a 1/2 or 3/4 ton(not a C&C, 1 ton, or dually), everything will bolt right into your truck. Bonus points if you can find one with 4.10's or 4.56's... double bonus if you can find one with a running 350 and blown trans(super common) or transfer(not that common). You should be able to find one for under $1000.. probably closer to $500 or less if it doesn't drive or is just a rolling chassis. If you get a complete truck that doesn't run, you can use what you need and part out the rest to keep other trucks on the road. Doing it that way, you would probably break even...
Trying to put new gears in what you have is expensive for a reason. A professionals time is worth something, it is not a quick job. I bought my 1980 K25 with 350/TH400/NP205 and 4.10 gears for $800(it had been sitting for years and didn't run), prior to that I bought a 1974 C20 with 350/TH350 and 4.56's for $600. It ran and drove well but had a bad brake booster.
,that you don't spend too much time listening to guys like peats.
