Rear end

michiganpat said
guessing you meant "take the gears"....

not sure if there were any differences/changes that happened between the early 70's and early 90's that might preclude that....IIRC there were some major changes to the 7.25" in the late 70's that made stuff like that not swappable.

The spine count change on the axles.
There is a slight difference in the ring gear to allow anti spin/anti lock.
They are swapable from what I understand.
This is worth checking into.

504DusterIR said
How would I tell if it a suregrip ? An I'll watch some videos on how to take cover off ( is it as simple as removing the ten bolts) an how to change fluid, most likely would benefit from a fluid change ( not sure when or if it has ever been changed, Im off from school tomorrow so if I get time I will wash it an possibly take it apart an send more photos

Raise the rear end of the car with jack stand under each side suspending both wheels like I said early and spin a tire. If the other tire spins with it, it’s a suregrip (posi) if the other tire spins against the tire your spinning. It’s a peg leg.