8" spool ?

I am trying to ID a Ford Differential Spool. The part Number is C4AZ-4204-E, I cant seem to find the discription in any Ford Info. Any one have any idea's. I would like to find out if this the Posi unit or not . Fasteddy

I'm not suire about the 8 inch but on the 9 inch posis the bolts that hold the unit together are countersunk where as the non posis are flat. Hope this helps

Originally Posted by fassteddy

I am trying to ID a Ford Differential Spool. The part Number is C4AZ-4204-E, I cant seem to find the description in any Ford Info. Any one have any idea's. I would like to find out if this the Posi unit or not . Fasteddy

On all ford posi units if you look into the hole were the Axle goes one side will have two sets of Axle splines and the open diff has one . One set of splines drives the clutch pack the other drives the axle gear.