LSD for G 50 ??? HELP
 

Hello,

I am looking for the part number of LSD for a 964 C2 gearbox. I have found this number in PET. 950 332 072 03. Could this be right ? Do I need all these ? The price of all is about 2500

That part number you listed is for a C4 LSD. Not applicable for a C2.

The PET part number for a std. 40% C2 G50 LSD is 950 332 053 00. There's also a C2 964 RS LSD 950 332 053 01 or 02 with 20-100% locking factor.

$2500 is very high. Guard Transmission sells rebuilt Motorsports G50 LSDs (with superior friction discs) for around $1350 last time I heard. Street rebuilt (also with the superior friction discs) for $1100 last time I heard. Guard supplies many professional race teams with their differentials. Very good reputation.

Kevin,
As I am in Europe (Greece) Guard purchase would involve taxes + shipping. Still cheaper though. Would the RS diff fit a 964 C2? What are the differences among the two diffs ?

I will guess yes, that the RS diff. will fit a normal C2. Pretty much all of the G50 diffs (excepting C4) are interchangeable from what I understand.

The difference between the two diffs (standard C2 vs. C2 RS) are the locking percentages.

Go here

http://forums.pelicanparts.com/search.php?s=&action=showresults&searchid=1495330& sortby=lastpost&sortorder=descending

for a couple of good topics by the experts. Geary is actually Guard Transmission in the flesh, by the way.......... :D

GT LSDs is the way to go. Why do u have to pay taxes? Shipping is not going to be that different... maybe $100.

I wish Paul Guard chimed in...

Funny you should mention taxes. I've been scrambling to get my '04 in this week, before "they" haul me off.

Anyhow, yes .... Porsche parts have been going through the roof. At $2,500 for a Porsche cast unit, our Chromoly fully adjustable LSD sounds like a bargain at $2,150. Only problem is that we're out of stock for the next 2-3 weeks.

The 5-spd transmission requires that the diff have the 3 speedo ring holes. Many of the 993 & later LSDs don't have these. Ours does, because it's meant to be a universal ('87 & later) LSD.

I've never tried to post a photo before. Let's see how it goes ---

Paul

http://www.thesamba.com/vw/forum/album_page.php?pic_id=232531

A little help for our buddy Paul.

http://www.thesamba.com/vw/gallery/pix/232531.jpg

All you do is click on the IMG button from your reply field (above where you type) and then paste the address in there. Or you can use the "Click here to Upload a Photo" link beneath your reply field, then it'll permanently be stored on Pelican's web board.

Man, that's a cool looking differential!

Thanks for the help, Kevin. (I thought that's what I did, but it didn't seem to work. I'll try again sometime.)

Yes, I've been pleased with the latest of these, as they now come with highly polished (isotropic normalized) internals.

Paul

Originally posted by KTL [/i]
There's also a C2 964 RS LSD 950 332 053 01 or 02 with 20-100% locking factor.

Would one of these 20-100% units work well a track-only 87 Carrera?

968 units are a direct fit as well . They are the torsion type . I have one of those for my g50 . Its an excellent straight line posi unit and will never wear out .

Kurt

So the C2 20-100 LSD fits but is it a good locking factor for my 87. Seems like Porsche didn't use 20-100 very long.
Bill

Thanks guys,
strange that the 968 box LSD can be installed in a G50. Are these Getrags ? I have heard tht the 968 LSD is Torsen type. True ?

A 20-100 LSD means 20 on accel. and 100 on deceleration, right ???

Yes. The 968 LSD is Torsen or a ZF clutch pack diff. Both were offered. Although I thought I heard the factory unit is no longer available?

The Zexell Torsen originally available in the 968 is no longer available. The replacement offered by Porsche is a cast, medium quality, 40% (40/40) LSD. Not nearly as nice as the Porsche Motorsports 40/60 (more accurately 45/65) version, but nicer than the street 993 version.

The 968 is indeed a G50-sized differential. The differential is probably the only part interchangable between the two transmissions. I'm not certain if it has the 3 speedo ring holes necessary for the 5-spd G50.

The Torsen TBD (or any TBD) will "wear out" eventually. They slowly loose effectiveness as the individual gear bores wear egg-shaped. The quality of BRAND of TBD determines the longevity of the unit. But certainly they don't require the somewhat regular maintenance of an LSD.

The main issue with the 20/80 or 20/100 LSDs is the material of the friction discs that were originally installed. Instead of the high quality material used in earlier 915 & 930 LSDs (plasma-sprayed steel), the "carbon" or "horse puckey" material was used. This material is rather ineffective after a SINGLE weekend on the track, or probably 5-10,000 street miles. (Obviously, a number of factors determine how many street miles.) These pitiful discs CAN be changed for the superior type. Careful measurements are required to determine the exact shim stack for replacement. Life is 10-20 times as long with the better discs.

The "carbon" discs can also disintegrate, making a black mess of the trans oil.

The second main issue with the 993 street diffs is that you don't know if you're getting the 4-friction disc version or the 2-friction disc version. The two friction disc version has half the stated locking effectiveness.

All that said, even a worn LSD helps a street car. It just wouldn't perform well on the track.