Low horse power rears. They are called 8.0 rears and are found in the colorado canyons and trailblazers. The case aluminum center and steel tubes pressed in and plug welded ...NO pins... Remember they are not building race rears so they will not go through that extra processing step.
If you are loking for a unique street road rear they would look coold and be light...BUT the guts are basically as follows.
Posi is the same as 7.5 and 7.6 just has larger carrier bearing huds for better oiling and to keep heat down.
The bearing caps are even aluminum...lol woof
Axle spline is 28
pinion shaft was upgraded to 1.625 inner bearing and the same outer bearing and same yoke 27 spline can be used...BUT they change to a 3 lip pinion seal .
All depends on how far you want to go with your car.
Jim