Fitting a 997 GT3 LSD to a 996 GT3
#1
Fitting a 997 GT3 LSD to a 996 GT3
Hi all,
I've been looking at upgrade options for my diff and am not able to find much information on the 997 parts. As far as I'm aware the stock 997 GT3 unit is not much better than the one in the 996.
That being said, would the 997 diff be a straight fit to a 996? What about the 997 cup LSD, would that fit a 996 gearbox and do you think it would be a worthwhile upgrade? Based on the pictures I've seen the diffs look identical.
Regards,
Anton
I've been looking at upgrade options for my diff and am not able to find much information on the 997 parts. As far as I'm aware the stock 997 GT3 unit is not much better than the one in the 996.
That being said, would the 997 diff be a straight fit to a 996? What about the 997 cup LSD, would that fit a 996 gearbox and do you think it would be a worthwhile upgrade? Based on the pictures I've seen the diffs look identical.
Regards,
Anton
#3
997 street lsd is going backwards. It’s 28/40. You’ve already got 40/60 locking factor. The ONLY difference between your LSD and a 996 Cup LSD is the clutches. Put a set of cup clutches in there and you have a cup LSD.
Or better yet, as mentioned, you can use my clutches in your unit. They last longer, offer more progressive locking, and cost less than the PMS parts.
regards,
Matt Monson
Guard Transmission llc
gtgears@yahoo.com
Or better yet, as mentioned, you can use my clutches in your unit. They last longer, offer more progressive locking, and cost less than the PMS parts.
regards,
Matt Monson
Guard Transmission llc
gtgears@yahoo.com
The following 2 users liked this post by GTgears:
Cheburator (04-24-2024),
Marv (04-24-2024)
#4
Hi @GTgears ,
I'm extremely new to this platform so please excuse my ignorance. Do you offer an OE or OE+ rebuild kit?
I won't track my car and I want it to be a stock as possible mechanically. I have 65k miles so a rebuild may be in my future. The beautiful CNC'd unit on your website seems like overkill for my use case.
Thanks!
I'm extremely new to this platform so please excuse my ignorance. Do you offer an OE or OE+ rebuild kit?
I won't track my car and I want it to be a stock as possible mechanically. I have 65k miles so a rebuild may be in my future. The beautiful CNC'd unit on your website seems like overkill for my use case.
Thanks!
997 street lsd is going backwards. It’s 28/40. You’ve already got 40/60 locking factor. The ONLY difference between your LSD and a 996 Cup LSD is the clutches. Put a set of cup clutches in there and you have a cup LSD.
Or better yet, as mentioned, you can use my clutches in your unit. They last longer, offer more progressive locking, and cost less than the PMS parts.
regards,
Matt Monson
Guard Transmission llc
gtgears@yahoo.com
Or better yet, as mentioned, you can use my clutches in your unit. They last longer, offer more progressive locking, and cost less than the PMS parts.
regards,
Matt Monson
Guard Transmission llc
gtgears@yahoo.com
#5
Hi @GTgears ,
I'm extremely new to this platform so please excuse my ignorance. Do you offer an OE or OE+ rebuild kit?
I won't track my car and I want it to be a stock as possible mechanically. I have 65k miles so a rebuild may be in my future. The beautiful CNC'd unit on your website seems like overkill for my use case.
Thanks!
I'm extremely new to this platform so please excuse my ignorance. Do you offer an OE or OE+ rebuild kit?
I won't track my car and I want it to be a stock as possible mechanically. I have 65k miles so a rebuild may be in my future. The beautiful CNC'd unit on your website seems like overkill for my use case.
Thanks!
#6
Hi @GTgears ,
I'm extremely new to this platform so please excuse my ignorance. Do you offer an OE or OE+ rebuild kit?
I won't track my car and I want it to be a stock as possible mechanically. I have 65k miles so a rebuild may be in my future. The beautiful CNC'd unit on your website seems like overkill for my use case.
Thanks!
I'm extremely new to this platform so please excuse my ignorance. Do you offer an OE or OE+ rebuild kit?
I won't track my car and I want it to be a stock as possible mechanically. I have 65k miles so a rebuild may be in my future. The beautiful CNC'd unit on your website seems like overkill for my use case.
Thanks!
The following users liked this post:
Malloy (04-24-2024)
#7
for the average GT3 owner, use Guard LSD Clutch plates
Hi all,
I've been looking at upgrade options for my diff and am not able to find much information on the 997 parts. As far as I'm aware the stock 997 GT3 unit is not much better than the one in the 996.
That being said, would the 997 diff be a straight fit to a 996? What about the 997 cup LSD, would that fit a 996 gearbox and do you think it would be a worthwhile upgrade? Based on the pictures I've seen the diffs look identical.
Regards,
Anton
I've been looking at upgrade options for my diff and am not able to find much information on the 997 parts. As far as I'm aware the stock 997 GT3 unit is not much better than the one in the 996.
That being said, would the 997 diff be a straight fit to a 996? What about the 997 cup LSD, would that fit a 996 gearbox and do you think it would be a worthwhile upgrade? Based on the pictures I've seen the diffs look identical.
Regards,
Anton
Do NOT, I said DO NOT "UPGRADE" to anything, just REPLACE your plates with Guard plates
I can walk you "down the path", but that would be a lot of work and ....
I replaced my stock LSD plates with OEM. Was I sorry.
Guard replacement plates are the way to go.
- Last longer...WAAAAY Longer.
- Work Better
- Most economical and cost effective
I can go on, and on, and on...but I will stop
You will thank me
Last edited by black04; 04-24-2024 at 01:15 PM.
The following users liked this post:
Malloy (04-24-2024)
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#8
WHOOOA You are going down the wrong path, man.
Do NOT, I said DO NOT "UPGRADE" to anything, just REPLACE your plates with Guard plates
I can walk you "down the path", but that would be a lot of work and ....
I replaced my stock LSD plates with OEM. Was I sorry.
Guard replacement plates are the way to go.
I can go on, and on, and on...but I will stop
You will thank me
Do NOT, I said DO NOT "UPGRADE" to anything, just REPLACE your plates with Guard plates
I can walk you "down the path", but that would be a lot of work and ....
I replaced my stock LSD plates with OEM. Was I sorry.
Guard replacement plates are the way to go.
- Last longer...WAAAAY Longer.
- Work Better
- Most economical and cost effective
I can go on, and on, and on...but I will stop
You will thank me
And apologies, I didn't read all the posts here, so I might have missed something and am shooting in the dark. If I am wrong, I apologize.
Further... I lied when I said I would stop.
You talk about "upgrade"...WHY? What is the problem? IF THERE IS NO PROBLEM DON'T FIX IT.
If you don't feel a problem there are two possibilities:
- You are not pushing hard enough to feel a problem
- OR you are pushing hard, but your diff is effectively "Open"
- I have no way to know your situation, but it is probably the latter
So I will double down on my "...if you like to throw money down the toilet", don't bother to do either. i.e. don't "upgrade" OR "replace"... you don't feel a problem. FULL STOP (that said, with that mileage I can guarantee that your diff clutches are worn out)
That said, if you want to learn to drive hard. Learn...and then spend the money to repair your diff.
Last edited by black04; 04-24-2024 at 01:36 PM.
#9
The OEM plates come with a "blacktop" warrantee. Once you drive it off the installer's lot they are effectively shot.
Okay, not that bad, but not far from it. You would be very lucky to get 30K out of OEM plates. Put the Guard plates in and it will drive like a different car. Really a superior product.
Okay, not that bad, but not far from it. You would be very lucky to get 30K out of OEM plates. Put the Guard plates in and it will drive like a different car. Really a superior product.
The following users liked this post:
Malloy (04-24-2024)
#10
My 996 GT3 that I purchased 3 years ago had 0 track miles and around 17,000 road kms. In that time I have done 5 track days with the car, each consisting of approx 1 hour of track time. In the first few events, the diff performed satisfactorily. At the end of the last day I could progressively feel the rear end becoming less stable under braking. The clutches are not yet toast, but getting there. It was interesting to be able to go “back in time” by starting off with a fresh 996 GT3 and experience the rather rapid decline of the differential, given that it’s a known issue.
The following users liked this post:
Malloy (04-25-2024)
#11
if you feel rear instability it’s likely the worn plates are degrading your handling. More wear and rough pavement could result in a skid You would be foolish to push to the limit in that condition
#12
yes, that’s correct, it was the LSD causing the rear end instability. Not really a major concern for what I am using the car for.
#13
Order of what you should do:
1) Guards LSD
2) Motorsports LSD w/ Guards clutches
3) Nothing
The cost of install makes putting a less than perfect LSD in a complete and total waste of money. Better off waiting until you can afford to do it right, because eventually you will regardless.
I just changed from a 997 Guards to a 996 Motorsports with Guards clutches. Both have similar performance under braking, but the Guards LSD is substantially better in high speed corners.
1) Guards LSD
2) Motorsports LSD w/ Guards clutches
3) Nothing
The cost of install makes putting a less than perfect LSD in a complete and total waste of money. Better off waiting until you can afford to do it right, because eventually you will regardless.
I just changed from a 997 Guards to a 996 Motorsports with Guards clutches. Both have similar performance under braking, but the Guards LSD is substantially better in high speed corners.
#14
Hi all,
I've been looking at upgrade options for my diff and am not able to find much information on the 997 parts. As far as I'm aware the stock 997 GT3 unit is not much better than the one in the 996.
That being said, would the 997 diff be a straight fit to a 996? What about the 997 cup LSD, would that fit a 996 gearbox and do you think it would be a worthwhile upgrade? Based on the pictures I've seen the diffs look identical.
Regards,
Anton
I've been looking at upgrade options for my diff and am not able to find much information on the 997 parts. As far as I'm aware the stock 997 GT3 unit is not much better than the one in the 996.
That being said, would the 997 diff be a straight fit to a 996? What about the 997 cup LSD, would that fit a 996 gearbox and do you think it would be a worthwhile upgrade? Based on the pictures I've seen the diffs look identical.
Regards,
Anton
996 Cup: 40 / 60 locking value
997 Cup: The locking torque of the differential is 40 % (power) and 60 %
(braking) (Dynamic locking value).
^Both quotes from respective Technical Manuals
#15
I don't understand why you say the plates are not worn out when they don't do their job and are ruining your handling.