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limited slip differential shims
Posted: Sun Apr 02, 2006 9:37 pm
by zambon
I have looked around at the price of differential shims on some of the usual websites and I am surprised by the cost.
I was under the impression that the shims were simply machined steel discs. I asked one vendor about this and he said somthing about a special coating. That sounded like bs to me, but I really dont know.
Does anybody have photos of differential shims? Does anyone know what they are made of and if they are a part that is difficult to have made?
Thanks
James
Posted: Mon Apr 03, 2006 1:09 am
by enzo
why no buy them directly from ZF? i payd ~30$ a disc
Posted: Mon Apr 03, 2006 1:41 am
by zambon
ZF? Is that the original manufacturer? I wonder if their parts are available in the US? I wonder how much I will end up paying to ship 4 discs back from europe...
$30 is $95 lower than the price I was refering to!
Enzo,
Do you have a link?
Thanks,
James
Posted: Mon Apr 03, 2006 3:06 am
by enzo
www.zf.com is the orignial manufactor of the gearbox
Posted: Tue Apr 04, 2006 8:25 pm
by zambon
Enzo,
You stated that you purchased the parts directly from ZF. Who did you contact? I cant find a good place to begin my inquiries from their site...
Thanks,
James
Posted: Tue Apr 04, 2006 10:59 pm
by enzo
I called them...they are 50km from my home...I can call for you if you want, but I need the number on the diff....
Posted: Wed Apr 05, 2006 9:10 am
by mark_atterbury
The shop I buy my bearings from gave me a couple of shims for free. Try you local bearing supplier. You can measure the stack with your current shims, then measure your current shim(s) and adjust. Just like setting the valves, only easier.
You don't need to worry too much about OD and ID of the shims. These are low weight parts and are moving at wheel speed (aprox 2200 RPM at 7000 RPM engine speed in 5th)
I see no reason to use shims with special coatings (is ther such a thing?) they are just taking up space. They dont move against anything.
Posted: Wed Apr 05, 2006 11:52 am
by Maurizio
I think he is looking for the friction discs? Anyone got the ZF number of them?
Posted: Wed Apr 05, 2006 1:04 pm
by zambon
I already have friction disks in my diff, don´t I? I am assuming that they are not worn out. Even if they are worn some, wont adding the shims tighten things even if they are worn?
I have never opened an Alfa LSD. Sorry I am asking ignorant questions.
Posted: Wed Apr 05, 2006 1:25 pm
by Micke
Mark is talking about play adjusting shims. I suppose most other guys are talking about the friction disks.
YES, they wear. Replacing worn ones improve the LSD.
The other trick is to add two disks to the existing 2 to increase locking from 25 to 40%. I guess "how to" is described in earlier threads.
Posted: Wed Apr 05, 2006 2:00 pm
by zambon
I am wanting to increase lockup. But I dont want to pay $125x4.
I dont know what I will need, but I have been told that the parts (friction disks?) can be custom made for less than $125 ea. I am trying to figure out how to go about things.
Does anyone have a discription of the friction disk?
friction disco
Posted: Wed Apr 05, 2006 3:00 pm
by Jack_Linguini
Hey Zambon,
might want to throw your question out to Andy at Performatek:
Since he does do the LSD rebuild and conversion. He ought to know:
http://www.performatek.com/Alfa/Drive%2 ... rential%A0
Bests
Jim L
Posted: Wed Apr 05, 2006 3:29 pm
by pancho
when I gave my GB to baloni he said he wouldn't touch the shims - the proper alfa way is to use the two extra friction plates - yes more exxie but proper.
Posted: Thu Apr 06, 2006 12:30 am
by zambon
I was confusing shims with friction plates.