I have them and LOVE them, but i have no idea what they are set at. Had the speed shop do it while i was getting the 31 spline rearend put in.

 

have you had any trouble with noise or your rear end "walking" around like cornering sway?

 

also what did it cost you to get 31 splines? and what are the parts you got since i'm guessing thats when you got your gears put in too....i need some 31 splines, i just had the rearend built 2 years ago and its already getting some slack in it, i'm gonna get it re shimmed and hopefully that fixes it

 

I've never heard that poly bushings were stiffer than spherical before. I thought spherical bushings were made out of aluminum?

I have UPR single adj lowers and non adj uppers with a poly bushing on my 6er. I set them to factory length, 17.5 inches center to center.

 

the spherical bushings allow it to twist and turn....the poly's are set and squeak like a mofo without enough grease on them. they are great bushings for other parts where you want it stiffer but our rear ends need some give so that they don't bind up and break anything

 

Looks like I'll have to order a different set for my GT rather than just swap them over... Good to know. Thanks.

 

I'm going to be swapping out my crappy stock upper and lower control arms as well as the bushings in the top of the axle. I got the double adjustable spherical end uppers and the adjustable spherical lowers. I was wondering if anyone had any suggestions on what to set them at for street performance. I got the spherical because buying the ones with polyurethane ends actually hurt your performance....they're a better design but the flex in your factory rubber bushings is the only reason you don't break anything back there. Polyurethane stiffens it up way too much but the spherical ends allow it all to twist and flex naturally while keeping it in place.Minus a panhard/torque arm set up I think its gonna be as good as it gets, I just wanna know if anyone else has used these and if so whats a good set up for them?

the spherical bushings allow it to twist and turn....the poly's are set and squeak like a mofo without enough grease on them. they are great bushings for other parts where you want it stiffer but our rear ends need some give so that they don't bind up and break anything

Look, Rev, MM97GT.... one of our pupils has graduated

"The pebbles.... have been snatched... from my hands"

 

I had noise problems for about a month or 2. But now noise is minimal. They squeaked BAD, but after wearing in they are fine and just make the normal spherical noises. No matter how much grease or wd 40 i threw at it there was no stopping that squeak, then after a few heavy rains it stopped.

I had gears already, they just reused them. If it is a good shop they can easily do it without a problem. And you will need 31 spline axles, 31 spline differential, differential girdle, and then of course fluid or whatnot. Differentials range from 200-400, or more if you are extreme. Axles about the same 200-300. And girdle is 90-140.