axle swap
 

Would a 98 and up bravada axle fit 01 blazer?

Yes,just need to make sure the gears are the same.
Check the rpo codes in the glovebox.

If I get one with 3.73 gears and mine has 3.42 gears will I have to change something I'm my computer to run 3.73?

You`ll have to change the gears in the front trans axle, thats all. find one with 3.42 gears

I think the shift points may be off going to 3.73, someone correct me if im wrong. It can be fixed by having the pcm tuned.

Not positive but dont think so, that has to do with rpm`s I believe

Good point, i know when i got my pcm tuned, he asked if i had stock gears or if i changed them, so i was thinking the pcm might need to know for some reason

guess it may be possible to change if wanted/needed

why would I have to change gears in front if I have a 2wd truck?

You did not state that earlier :) that makes things much easier. Still dont believe you need computer reprogrammed