HI-
I am going to look at a rear end out of an 1985 Camaro Z-28 HO that has supposedly had 3.73's and posi installed in it not too long ago. How can I tell this unit has posi? It is still in the car but it is not running.. I was told if I jacked the car up and put it in neutral and rotated the tires both should move the same way. Is this true? Or if i took off the axle cover should I be able to see anything that would give it away being a POSI and having 3.73's??


Thanks in advance for any help and information,

Dan

 

Yes, if its posi both tires should turn.If you take the cover off look inside the case (posi unit) and if there are springs in it then it is a posi.

 

Yea, the best way is to have a buddy hold the other tire then spin the one your on and they will both start to spin in the same direction. If you were to just spin one tire the other might not even move due to the limited slip that keeps the rear end on the ground when you turn corners.
SSC)

 

Put it in gear and try to spin one of the rear tires. If it spins free and the other wheel spins the opposite you don't have posi. With posi, you either won't be able to spin it or it will have some resistance.