i need to know if i can use the rearend out of a 86 camaro which has a v-6 auto posi rearend. to put in my 91 firebird which has a 305 TBI with a auto. thanks for the help. and one other thing how can i tell if it is actually a posi...

 

Posi is a limited Slip. Unless you change the complete axle assembly it will work. Right now you have 26 spline vs 28 spline axle shafts and that will not work just changing the 86 carrier. Pull the cover and see what it is.