I have bought a Guard lsd Gt2 Pro (40/60). Anyone has experience with installing this? The service from Guard was good, but the info on installation sparse. I will use a local workshop if possible and not too risky.

Since this is my first post, I should also introduce myself. I live in northern Norway, drive a 996 turbo with about 540 hp, which I have had for almost 2 years and 34000 miles. The car is a dd. I have recently converted to RWD. Very happy with the car.

 

I am sure if you call Matt he can help you with install or provide more info.

 

Read this thread, it has a DIY with photos and many questions and answers from Matt at Guards.

https://www.6speedonline.com/forums/...ght=LSD+buster

 

It is easy if you have some experience with working on cars. First off you do not need to disassemble the whole trans, just remove the diff cover and pull out your old diff, paint 6-7 teeth on the ring gear with spray paint then with the tranny laying on its side reinstall the diff and cover turn the input shaft or the front drive coupler a few times, back and forth not round and round to make a nice set of witness makes on your ring gear. If you do not have the stud axles with the bolt in the middle you will need to get them or modify yours to work. You do not need to reset the pinion gear depth (output shaft) because it is set to the ring gear (king gear). What you will need is a press, shims,and new bearing for the diff. I always brake the ring gear side bearing taking it off. Swap out the ring gear on your new lsd. You can measure mounting face of ring gear to stop of small bearing on both diffs and get your shim size from the that. You will need to shim the non ring gear side to set the depth of the gear contact or "bite". Here is where the witness marks you made come in, now paint 6-7 teeth on the ring gear opposite of the first set then turn the shaft back and forth and make marks in new paint an compare the "bite" If your math was good it should be exactly the same. now you set the the ring gear side to just turn when you turn the input shaft with the trans in neutral. It does take some time but it is not that hard to do.

 

Thank you for helpfull information!

 

One thing about the LSD-buster-thread, which by the way Matt told me to read: the lsd installed there was a rebuilt porsche, and I understand there must be some differences when an open diff is to be replaced with a Guard unit.

 

That is the reason I posted what I did

 

The information provided by me was that the LSD should be installed according to the directions in the factory service manual for setting up a ring and pinion. If the shop installing the LSD does not have the manual and/or does not have the proper tool for measuring the ringgear backlash they have NO business being inside of that gearbox!!!

I told you this up front and you assured me that your technician had the skills and knowledge to install this piece. Installing an LSD is not anything special outside of factory specifications. Our LSD unit is EXACTLY the same size and dimension as a factory LSD and should be installed EXACTLY the same way that it is described in the factory manual. This is why we do not include instructions. Installing an LSD is not a DIY operation in our eyes. It is for expert mechanics, which is why they generally charge 6-8 hours for an LSD install. There are special tools and multiple measurements that must be checked, rechecked, and adjusted. If this is not a skillset the mechanic installing the LSD possesses then another mechanic needs to be found.

That said, there are people who have reasonable success using the bench method that Tim94NYC has provided for you. One uses those directions at one's own risk and is not how we would recommend going about the installation.

The one last thing I will add is that the ring gear flange on the open differential in your turbo car is 2mm thinner than the ring gear flange on the LSD. At a bare minimum, you will need to adjust your ring gear location and shim stack by that 2mm when installing the LSD, which I think we discussed in our initial conversations about putting one of these into your car.

Also, others will correct me if I am wrong, but there is a link stickied in this forum that gives members access to downloading the manuals. If your tech thinks he can install this properly, I would at least suggest you download the gearbox section of the manual and provide it to him, though if he doesn't own a VW 385/17 backlash tool he may still have some issues getting it right, even with the manual.

 

Thanks for your answer. The local workshop told me they can do it, but also
that they needed more information than I had, thus this thread. They have as far as I know not done such a replacement before, so I should be careful. I also spoke to Porsche in Oslo, they said it will take 15 hours, which I thought a bit much.

 

You're welcome.

The dealership told you 15 hours because they are also counting the time to remove the gearbox from the car and reinstall it after the LSD is fitted. This is the way that the factory tells you to do it, and the way that the many independent gearbox mechanics will also do it. Some gearbox specialists will do it with the gearbox in the car, but it's generally a personal choice. My number of hours of labor listed above are strictly for the LSD installation itself, and not any related labor hours beyond just the LSD work.

 

Ok. Probably better safe than sorry and let the Porsche workshop in Oslo do it.

 

Matt, How would you take the needed measurements that installing a new diff would need using the backlash tool with the trans in the car. I feel the trans has to out of the car.

 

You and I are in agreement on this one. I personally think that the tranny should come out. But I know that there are some very respected installers, some of whom are listed on our preferred installers list on our website, who do it with the gearbox in the car.

My position on it is that I'm not going to lecture some guy who has been doing this for 20 years that he has to take the gearbox out of the car. If he's figured out a way to get it right with it in place, I'm not going to argue with the guy. If he does it wrong and ring and pinion eats itself it's his liability and name that's mud.

Part of why I focus on being a wholesale operation and not a retailer is because these parts do require specialist installation. You don't see our parts listed on the major mail order discount websites because they are just reselling them on to the end user who may or may not take it to an installer who knows what they are doing. Selling at wholesale gives me greater control and knowledge of who is doing the actual work.

Overseas, like sel's situation, gets a little tricky because there aren't very many good builders that I know of in Norway. We've got dealers in Denmark and Sweden whom I trust, but Norway isn't really somewhere that I can be much help with a proper referral for an installation. So, I sell to the end user in this circumstance, and help him as best I can get it done by someone who can properly do the work.

 

Who is Guard´s dealer in Sweeden?

 

Stig's Garage