nowata

pitts12driver

Spyerx

misterbeverlyhills

I am thinking of doing the same and was trying to find an OEM diff to recondition. RARE. For a C2 at least.

Why Guard and not Quaife?

I checked pricing for a Guard and they are out there for $1500-$1700, where do you get the $3k number?

kreeshp

Re: Guard vs Quaife - if you do a search here, there are lots of threads on this. Essentially, the Quaife or any torque bias differential doesn't lock up under deceleration/braking and acts like an open diff under these conditions, so you get less stability during deceleration/braking versus the clutch pack conventional LSD's (e.g. Guard). Torque bias diffs like Quaife are best suited for street use and the clutch pack LSD's are best suited for track use, is the conventional wisdom. If your budget allows for regular rebuilding of the clutch packs, the conventional LSD's are the way to go; the clutch packs are wear items unlike the Quaife units.

In another thread, I recall reading that Guard had to up their pricing recently thanks to the POTUS's new tariffs on metals.

Spyerx

There are several Guard models. I have them in my other cars. I have beat the crap out of the one in my RS and it's lockup is still at spec (like 1000's of aggressive track miles w/ sticky tires). I don't know the full range pricing, call any guard dealer they can tell you.
I have the stock LSD in my car, it was spec'd with it. I wouldn't bother.
I have the GT2 PRO in my car. They are about $3k.
No idea what the Club costs.
Now the Pro+ which is really at the next level big HP cars and pro racing. Its a WORK OF ART.
Personally i would not put a TBD in my cars. You want them to work under acceleration and deceleration. 911 under threshold braking can get very tail light, the diff keeps the rear end planted.

Guard Diff Options:
GT3 Club GT2/GT3/G50/996/Turbo/968/Boxster S ’00-’04
GT2 Pro GT2/GT3/G50/996/Turbo/968/Boxster S ’00-’04
GT1 Pro+ GT2/GT3/G50/996/Turbo/968/Boxster S ’00-’04

Club – 1045 Billet body, still far stronger than any Porsche or ZF LSD. All of our LSDs come standard with 4 friction discs, however, 6 or 8 disc versions are also available.
Pro – High Strength, hardened 4340 Chromoly billet, 8620 cover, multi disc
Pro+ is 100% 8620 billet

mooty

guards, there is NO substitute

GTgears

I'd love to see what you are being offered for 1500-1700. That's below my cost to make them. +/-$3k is correct. The Club is a bit over and the Pro is a bit under that number. Only product even close to the quoted price is our service pack with ramps to rebuild factory GKN LSDs.

tjb616

You can install these with the trans in the car, correct?

And they are the same for a 964 and 993 trans? So if I had a 6 speed in my distant future but wanted an LSD for the upcoming season, I could transfer it over when I install a 6 speed without having to buy a new diff?

Steve Weiner-Rennsport Systems

Technically, you can, but if the pinion depth needs a correction, the gearbox must come completely apart.

Yessir, same for both versions of G50 transmissions.

JasonAndreas

If you have the stock heat exchangers it is a royal PITA (removing the studs even becomes an issue) to remove the diff covers with the transmission still attached to the engine.

GTgears

We strongly advise against doing LSD installs in car. Backlash is something set to 1/100th of a mm using a special factory tool. Getting it right is infinitely simpler on a stand. And getting it wrong doesn't just make your gearbox noisy, it makes the ring and pinion eat itself in 10,000 mi or less.

tjb616

Good too know, that you Steve and Matt! Sounds like I'll wait until it's 6 speed time to buy a proper LSD.

jeff33702

Cool timing on this. I was able to purchase a "new" G50/03 and I'm considering LSD for it. Are there any setup instructions for the nerd in us? I've setup a few rear ends over the years but no transaxles - is this something that I could do with relatively low risk?

Thanks

GTgears

That tool I mentioned? It runs about 3 grand. And then you need to learn to use it. Set up instructions are according to the factory manuals.