Rotor hat dimensions

My dilemma.

Rear discs on semi float axle. The actual rotor sits out too far to mount the weld on caliper mount. I need to have the rotor in closer, so basically i need to find out how a rotor hat is measured. Is it like a wheel?? I could take a pic if necessary

i had the same issue on my nine inch. i searched thru all the lug nut studs available and finally found some that would allow me to mount the rotor on the back side of the axel flange.

it did two good things:

moved it far enough in to mount easily.
rotor is not loose when i remove rear wheels.

What axle?

dana 60 rear. with big bearing ford ends IIRC, its a 6 on 5.5.

What about front rotors off a Chev full float? (I have one you can check)

Early GM are 1.5" (up until mid 80's sometime). Late GM are 1.00"

basically the rotor hat needs to stay at the same mounting surface, but the actuall braking surface needs to move in towards the centersection.

Rotor hat is measured from the face of the rotor to the top of the "hat".

hmm, not too keen on the technical terms, but i think it needs to move in an inch or two.

I'll take a pic and post it up later tonight. Marc knows whats going on, Pics do a better job explaining.

I had the same problem on my toy rear--I just put the rotor on the inside of the axle.

Allright, here we go. As it sits right now the caliper bracket would have to be welded on the bearing housing...Bad. Knowing my luck i'll find a new rotor and i'll have to weld the caliper mount ontop of the housing end weld...anyway i need to move it in at least a inch..