alright, i'm pretty new to the rear end game and i've done some searching. i don't know what i have in the back, all i know is i have an '84 v8 z28 305 with the super powerful LG4

seriously though, i was at the yards and noticed a 4th gen z28 (didn't remember to check the year) and it had rear disc breaks. so would there really be any downside to getting it? i called them up and they only want $78 for it. what should i check? and i don't mind that my rear wheels will stick out a little bit...