It's a mutt .It's a rusted out '75 Plymouth Road Runner with a '72 440 4 barrel with an A833 4 speed .The rear is an 8 3/4 for sure, but I've never seen one not turn forward or backward when you turn one wheel forward. It started to turn the same direction and then didn't turn at all. I'm assuming it's a wiped out sure grip. May keep the third member and send the rest of it with the body off to the guy buying the body off of me .
Does my description of the problem sound like it is a sure grip unit?
I didn't check until I had the driveshaft, motor and tranny out.
No . Trying to learn something here .Motor, tranny and driveshaft out of car. I assumed that I could tell if it was a sure grip by turning one wheel and watching the other as in the past experience I had, the other side would turn the same direction if sure grip, and the opposite direction if open . I've not had one start to turn the same way, then not move at all. I'm lost here .Sorry to be so unsure, but trying to learn .
OK... All you will need to do is somehow hold the pinion flange and try to rotate one side. If it rotates, and the opposite side rotates the opposite direction, it's not a sure grip. If it doesn't want to rotate, it's a sure grip.
Ok .In a nutshell, that's exactly what I needed to know!! Thank you so much!
I'll check it tomorrow .
I'll have to use the second option as I have pulled the motor, tranny and driveshaft out of this donor car .Trying to decide if I want the diff or not before I send the body to it's new owner.
Not sure which case it is. It's a parts car thst I bought for the 440 and 4 speed tranny, shifter and other running gear . Was planning to yank the diff if it was sure grip .It's an 8 3/4 for sure, just haven't crawled under it to see which case . I'll have to look at the one under my bench in the garage to see where the numbers are . Don't remember .
