I have buddy that will sell me his Monte Carlo SS rear end for cheap. It's a 7.5" out of an '86 and i am looking to swap it into my '89..... Is this an easy swap that will just bolt right up? Thanks

not easy and won't bolt right up and basically it isn't any differant than what you have

maybe if it was from a 87 GNX....that would be fun

like ede said, the same weak rear as our thirdgens...also no place for a torque arm

All 78-88 Montes received the 7.5 with 26 spline axles. It's way narrower than the third gen rear and not worth doing when there are tonnes of 82-up housings out there.