just wondering what was the best rear end gm made that will fit? and im not into the ford 9'' at all, i want to keep it all gm. just trying to find the strongest rear end so i wont have to worry about breaking much when i get my new engine.
and one supid and quick ?...what is the diff between a posie and differental....and what does each do?

some things r just worth asking.... thanks!

 

12 bolt from moser

 

the differential is the set of gears that converts motion from the driveshaft to the two rear wheels (it's the big thing in between the rear axles). a 'posi' is a TYPE of differential. with a normal differential, if one rear wheel is spinning, you won't move forward. with a posi (positraction, or limited-slip), the differential transfers power to the wheel with the most traction, so you can still move if one rear tire is spinning. if you want the strongest, most enthusiasts swear by a 12-bolt moser, but it's not cheap. the 9-bolt Borg Warner was stock on some 3rd gens. it's not quite as strong as the 12-bolt, but is a lot less expensive.

 

thanks alot for clearing that up and for the info.