gm 12 bolt rear
 

how do u tell if its out of a truck or car?
and how can u tell what gears are in it already?
the number on it is nf 3896888 dont know id thatl help or not

Only thing I came up with that number was it's a portable electric hammer drill :shock:

hope this helps, Cp

You can pull the cover, count the ring gear teeth, divide that number into the pinion teeth.
Ball park ratio.

E.G ---> 39/7 = 5.571429 or what is commonly refered to as a 5.57 gear

ok its a 3.73
but how do i tel if its out of a truck or car, its 6 lug, did they even put 6 lugs on cars?

Truck has the smaller pinion shaft, car has the better larger pinion shaft and bearings. And if it has 6 lugs it aint no car axle if they are stock.
Bruce

car should have the rings for the 4 link bushing,or did the cars also have leafsprings too? :? :? :? :oops: :oops: :oops:

Yes, The camaro, & Nova come to mind.
Bruce

ok cus the leaf mounts are at an angle on this 12 blt
and on my stock 10 bolt they r straight

hahahahaha

A truck the leaf mounts would be on the top of the housing as a F body will be on the bottom of the housing.

o ok then its out of a truck