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Mark the position of the flywheel on the crank. Transfer weights to new flywheel.
Your stupid advice is useless and you've quickly proving you're nothing but a troll since you first asked what's the best way and then attacked the answer to post that stupid advice as if it's fact.
That advice has failed people many times and GM even removed it from the service manual because it doesn't work.
Match balance is the only way to guarantee you won't have an issue. Next closest way to most likely not have issues is installing a new PROPERLY zero balanced clutch and flywheel assembly.
There's a part that was missed in the quote of Bill that makes it WRONG. It will only work IF the balance of BOTH the new and old assemblies match. A zero balanced new assembly won't work with the weights transferred if the weights fixed an out of balance old assembly.
And before you post more wrong info, people have found new clutch assemblies out of balance so no, they don't always come properly balanced.
Last edited by lionelhutz; Apr 21, 2021 at 09:44 PM.
Your stupid advice is useless and you've quickly proving you're nothing but a troll since you first asked what's the best way and then attacked the answer to post that stupid advice as if it's fact.
That advice has failed people many times and GM even removed it from the service manual because it doesn't work.
Match balance is the only way to guarantee you won't have an issue. Next closest way to most likely not have issues is installing a new PROPERLY zero balanced clutch and flywheel assembly.
There's a part that was missed in the quote of Bill that makes it WRONG. It will only work IF the balance of BOTH the new and old assemblies match. A zero balanced new assembly won't work with the weights transferred if the weights fixed an out of balance old assembly.
And before you post more wrong info, people have found new clutch assemblies out of balance so no, they don't always come properly balanced.
Show me where weight transfer was removed from the manuals.
Show me where match balanced was added to the GM service manuals.
Show me where gm clutch packs are not zero balanced.
Show me someone who bought a gm zero balanced clutch who weight transferred and had vibrations.
Show me the name and phone number of any corvette certified gm master technician who disagrees with me.
I’ll wait. 🍿
Last edited by Bjensen2001; Apr 21, 2021 at 09:56 PM.
“Clutch/fly wheel balancing is obviously a very hot topic and one discussed thoroughly in the past. However, there appears to be service manual updates and new instructions that may change the hundreds of previous posts regarding the same. Apparently the new updates say that weights shouldn’t be transferred.”
Please post the service manual updates and the new instructions you reference.
“Clutch/fly wheel balancing is obviously a very hot topic and one discussed thoroughly in the past. However, there appears to be service manual updates and new instructions that may change the hundreds of previous posts regarding the same. Apparently the new updates say that weights shouldn’t be transferred.”
Please post the service manual updates and the new instructions you reference.
I would be getting the balance of my new clutch checked before installing it. They're supposed to be balanced, but it's a big job to do only to find out it actually wasn't....
When I did my clutch two years ago I bought an LS7 clutch and a ram billet aluminum flywheel, and like you I didn't want to risk it not being balanced. I took it to THE old school machine shop in town that has been in the game for forty years, to get it "matched balanced" and he laughed at me (I'm a nice way). He explained that it is in reality almost impossible within a reasonable amount of shop time to recreate an out of balance situation, and what is most likely happening is GM was taking the clutch assembly closer to a zero balance during the hot balance process to alleviate NVH in the Corvette's overly sensitive drive line. So I trusted his experience and judgement, and he found my new clutch pack was over 6 grams out if balance from Luk / Ram. I installed it and there were zero vibrations and it feels like stock. So I didn't transfer the one weight from my old flywheel to the new, and I ensured the new assembly was balanced, and it is good to go. That's just one dumb guys experience 😁
Last edited by CinciZ06; Apr 22, 2021 at 09:29 PM.
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I would be getting the balance of my new clutch checked before installing it. They're supposed to be balanced, but it's a big job to do only to find out it actually wasn't....
When I did my clutch two years ago I bought an LS7 clutch and a ram billet aluminum flywheel, and like you I didn't want to risk it not being balanced. I took it to THE old school machine shop in town that has been in the game for forty years, to get it "matched balanced" and he laughed at me (I'm a nice way). He explained that it is in reality almost impossible within a reasonable amount of shop time to recreate an out of balance situation, and what is most likely happening is GM was taking the clutch assembly closer to a zero balance during the hot balance process to alleviate NVH in the Corvette's overly sensitive drive line. So I trusted his experience and judgement, and he found my new clutch pack was over 6 grams out if balance from Luk / Ram. I installed it and there were zero vibrations and it feels like stock. So I didn't transfer the one weight from my old flywheel to the new, and I ensured the new assembly was balanced, and it is good to go. That's just one dumb guys experience 😁
I think that is common if they do not do this often. Basically what Monster does (I believe) is mount the two clutches together 180 degrees off and then balance the whole damn thing to neutral. That effectively makes the new assembly have the same imbalance as the old. Pretty simple when you look at it that way and if you have a jig set up to do more than a few of these.
It is a mess of a deal - luckily most people end up close enough, some have headers and bullets that vibrate the care more than the new clutch would anyway....
I think that is common if they do not do this often. Basically what Monster does (I believe) is mount the two clutches together 180 degrees off and then balance the whole damn thing to neutral. That effectively makes the new assembly have the same imbalance as the old. Pretty simple when you look at it that way and if you have a jig set up to do more than a few of these.
It is a mess of a deal - luckily most people end up close enough, some have headers and bullets that vibrate the care more than the new clutch would anyway....
Your quote shows the problem with just installing a new clutch. It wasn't zero balanced.
I have yet to read about a clutch problem where the clutch was confirmed to be zero balanced before install. It was simply installed and then vibrations occurred.
Your quote shows the problem with just installing a new clutch. It wasn't zero balanced.
I have yet to read about a clutch problem where the clutch was confirmed to be zero balanced before install. It was simply installed and then vibrations occurred.
I think you might be missing the part about C5s M6's getting hot balanced perhaps.
If your stock C5 M6 clutch has weights added to the flywheel, it is no longer zero balanced. It now has what is essentially a minor external balance to bring the rotating assembly to a tighter tolerance as part of the "hot balance" process GM did for C5 Manual transmission cars. If you remove the stock intentionally out of balance FW/PP and add a new zero balance FW/PP, you will sometimes get a nasty vibration that was not there before.
I think you might be missing the part about C5s M6's getting hot balanced perhaps.
If your stock C5 M6 clutch has weights added to the flywheel, it is no longer zero balanced. It now has what is essentially a minor external balance to bring the rotating assembly to a tighter tolerance as part of the "hot balance" process GM did for C5 Manual transmission cars. If you remove the stock intentionally out of balance FW/PP and add a new zero balance FW/PP, you will sometimes get a nasty vibration that was not there before.
It's just conjecture that the weights put it out of balance. The installed clutch could have been out of balance and the weights brought it closer to neutral balance. No-one actually knows what the final balance is because it wasn't and couldn't be measured after the procedure was done. I've never seen a post with the measured balance of a used clutch after it was removed. Even then, data on one or 2 clutches isn't a big enough sample to know what went on.
However, quite a few people have found a new clutch assembly to be out of balance so believing "new is already balanced" can fail you.
If the original and new were both out of balance and heavy on different sides then transferring weights could make for more vibration, not less.
What a shame you didn’t join the forum yesterday before bjensen2001 got kicked out raheem. You could have asked him directly. I guess we will never know what those recent updates to are. Just think about it, GM spending engineering resource to come up with a service update for a platform they retired 17 years ago; and then apparently keeping it so quiet that only a brand new, but short lived, forum member has heard of it.
So sorry. I think you confused. I ask toys about the update that he referenced on his YouTube video comments. Nevertheless, I think GM would be the best source for this information but no one seems to have the up to date service manual. Date of the last year of the model has nothing to do with service bulletins. Plenty of clutches have been replaced on C5’s by dealers even under warranty. I’ll contact my GM rep this week about this issue and provide his response. I’ve had two clutches replaced at my dealer and never had any issues. One was under warranty and another at 60k when I had my rear main seal replaced. No issues with that clutch either. If they are 2 for 2 with my car, I’m sure they have the answer! Will be interesting to see how it compares to the forum!
Can toys4life expand on his comment YouTube post? I’m curious what the gm service manuals said specifically. The best source of this issue is GM but I just find it odd that no one can actually say what GM says.
Can toys4life expand on his comment YouTube post? I’m curious what the gm service manuals said specifically. The best source of this issue is GM but I just find it odd that no one can actually say what GM says.
BJensen2001 - Back already, that was quick.. You must have your C5 tore apart and trying to figure out what to do before you put it back together.....
BJensen2001 - Back already, that was quick.. You must have your C5 tore apart and trying to figure out what to do before you put it back together.....
Would you please post the excerpts from the GM service manuals you reference. Thank you! You explicitly state you’re confused.
What did the original service manuals say?
What year was the change?
What was the tsb # of the change?
What does the new service manuals say?
Why were they changed?
Do dealers have any comebacks with the new updates?
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