Quick Change Rear End

I know that quick change rear ends are used extensively in speedway racing, does anyone know of tarmac cars that use or have used them.

I have never used them but I would expect that they would be good in a lot of sedan/saloon categories. Give you infinite choice of diff ratios without huge expense.

I've seen a couple of Winters diffs used in Yank Tanks over the years, but with all that power I wouldn't have thought they needed an infinite choice !

They probably dont need infinite choice but it is a cheap and easy way to change ratios for different circuits. I have been told they are cheap and bullet proof, two very good reasons to use them.

I have seen these used in Trans-am cars ova the years mainly when guys are using 4 speed gear boxs with a 1:1 4th I have also seen the winters non quick change diffs used in these cars as well they seem to be bulit proof although a bit of a mongral to set up back lash etc the other good thing with them is ease of fitment of axle tubes.
I have also seen these used in open saloon cars fitted with rotors and turbo 4 Cylinders with a lot of sucess.

I have seen these used in Trans-am cars ova the years mainly when guys are using 4 speed gear boxs with a 1:1 4th I have also seen the winters non quick change diffs used in these cars as well they seem to be bulit proof although a bit of a mongral to set up back lash etc the other good thing with them is ease of fitment of axle tubes.
I have also seen these used in open saloon cars fitted with rotors and turbo 4 Cylinders with a lot of sucess.


I dont suppose you noticed whether they had watts linkage and how it was fixed?

Yeah sure did most Trans-am cars run a very low roll centre and the watts has a braket that mounts under the centre of the diff and picks up on 3 of the through bolts with the piviot mounted of that and the links out to the 2 lower chassis rails.
I have also seen in a chassis book a deal where it mounts of the front pinion carrier also cant see why a V8 Supercar deal wouldn't work or a braket of the quick change cover bolts.

I was thinking of the supercar type mount on the chassis but I dont know about the mounts onto the axle tubes, could be a lot of twisting.

Yeah I have just done one on to a 9" diff and used molly tube and box in a trianglular shape if you surch the web for 4 link/watts link kits for 60's mustang rear ends there are some good ideas and photos with some of there watts link mounts I was lucky enough to have built a supercar and had photos of the diff

I dont suppose you have those supercar pics on your computer?

I should explain that I am designing a sports sedan chassis and think the quick change rear could be a cost effective option.

No only hane one and it isn't that great but its hard copy not digital have a look at lateral-dynamics dot com there one is very simalar

I spotted one on a Chevy Camaro entered in Classic Modified Saloons. Also a guy who used to race a Firebird over here had one fitted.

Just been to Pukekohe racing and I spyed a Quick change in the back of a Dodge Viper running IRS very tidy simple but trick looking setup I understand it was done by Mitchell Motorsport here in NZ

World of Outlaw sprint cars use them and it takes about 40 seconds to change. I can't figure that out, but those guys are pros.