[Cris@JCG]

Originally Posted by Gonzo

I just got off the phone with Larry C from Pro-Touring.com.. He was having serious issues with piston knock back on his rear brakes & took his car over to Wilwood to see if the issue could be fixed.. He has a 12 bolt with Torino ends & using a Detroit Truetrac.. Wilwood did eveything they could do to work out the end play out of the axles.. but was still having piston knock back.. One thing that was discovered was that when the car was put up in the air & the load was taken off the wheels, it would hang the tires as if something was lose.. Put the rear on load & it would tilt the wheels in..

I just looked up on how a Detroit TrueTrac unit works.. worm gears is how this unit works.. They do not machine a bore to locate the gears that go into the splined portion of the axle.. If the axle is not located on the splined portion of the posi unit it is going to create alot of movement that can hurt the outer bearing & seals on the axle end..

Now take a look @ a Detroit Locker with spider gears & clutch pack.. the spider gears that go on the splinded portion of the axle is bore machined & located on the posi unit that keeps the axle cented on the axle tube..