If the knowledge from our experience isn't enough, buy the book from JRT.
Anywhere from 15.00 bucks to 30.00 if you search hard enough.
Back to the tranny, you probably have the NV3500 5 speed. A grenade under all V-8 applications. Who knows maybe you'll get lucky and actually have the NV4500. That thing will handle a little bit of grunt. Unfortunately the NV4500 was found behind the 4.3L 90 degree engines in the S-10s. It was also found in some of the passenger car series. Big problem with those is, it didn't have shift rod stops placed in them from the factory and the shift forks were/are prone to snapping off. So it's doable, it just has it's problems too.
Before you made a boneheaded mistake, we tried to stop the bleeding before you stepped on your own DI** and save you a whole lot of heartache and a lot of walking.
Buy the book, it's more than enough info to satisfy you.