So I'm looking at finally replacing my original stock clutch. My car is Gm stage 1 and then a mild tune. ZZP down pipe , KN intake and muffler delete. The car works really well. The stock clutch started slipping in the winter 3 years ago. But when the warmer summer weather came it wouldt stop slipping each year. So I never replaced it until now. How ever this year it doesn't seem like it will hold anymore. So I need to finally replace it with a new clutch. I bet the clutch disk itself isn't too worn either. It is probably just the pressure plate is getting weak and doesn't clamp as strong as it use too. Any ways , my question is. I plan on getting another STOCK clutch and pressure plate. I will NOT be getting a new flywheel as they are all now roughly $500 to $600 dollars. So I will have to reuse my OE flywheel. And have it resurfaced at a machine shop. Are the Lnf flywheels able to be resurfaced? I have read a few threads saying that it will blow out the Throw out bearing if you resurface the flywheel . Is that true ? Also , if it is the case. Would buying one of the shims from ZZP to use on the tob stop it from overextending and blowing out the seals ? And which size would I need. Zzp makes 2 sizes. A .2 and a .15 . Any help would be much appreciated.

Ps. Is it at all possible to remove the lnf tyranny WITHOUT dropping the subframe ?

Thanks

 

Just go with the luk flywheel from rockauto. I'm using it on my lnf with gmpp clutch and its been working great for me. I dont see how you can drop the tranny without having to remove the frame its not hard to do its literally 4 bolts. Ive dropped my trans twice all by myself

 

I wouldn't reuse the old flywheel, machined or not. I had one machined in my base Cobalt, and matched up with a Spec Stage 2 clutch and it seemed like it was always slipping, and it was noisey kinda like a chattering. The noisey part could just be from being a spec clutch which are known for being that. Sure the OEM one is expensive, but ZZP and OTTP both offer an OE alternative. ZZP has lightweight options, and there is always the other OE alternatives on other sites such as Rockauto and Amazon. You are going to have to remove the subframe. I don't see anyway of dropping the trans without doing so. For a clutch Kit you should check out Crate Engine Depot, they have a GMPP clutch setup for the LNF at a good price.

CED Clutches
Clutch Kits

OTTP Flywheel
https://www.overthetopperformance.co...eel_p_160.html

ZZP Flywheel
https://zzperformance.com/collection...l-f35-flywheel
https://zzperformance.com/collection...wheel-2-0l-f35

Rockauto Flywheel
https://www.rockauto.com/en/catalog/...,flywheel,5348

 

Can a dual mass flywheel be machined anyways?

 

ZZP flywheel is sold out. It's important to note that the LNF and LSJ can use the same flywheel though... so you can just grab an LSJ one.

Also, is the LNF flywheel actually dual mass? The ones I've seen looked identical to my LSJ flywheel, which is definitely not a DMF.

Finally, this: "this next line is directly out of the GM Service Manual: Important: In order to maintain the proper component balance, contact surface taper, and heat transfer, manual transmission flywheels are NOT to be machined."

 

No the lnf or lsj flywheels aren't dualmass

 

My understanding is that the Lnf and Lsj flywheels are different. According to the Gm dealer they are totally different part numbers. So therefore there is some sort of difference between them. There sure is a big price difference. Sense the Rockauto Lnf flywheel is less then a hundred dollars. It makes no sense i guess to turn a stock flywheel and possibly have problems with it. They lirlterally are the same price. And according to Gm them sells the Lnf flywheel should never be turned and resurfaced for several reasons. Like heat transfer. Over extending the throw out bearing. And some how less clamping force as well from a turned down wheel.

 

Yeah its not recommended to resurface. Some have done it with luck but I wouldn't do it to to have peace of mind. Specially when you can get that luk for like 100 plus shipping

 

I'm thinking of getting the stock Gm clutch kit from ced. It comes with the Disc , pressure plate. New flywheel bolts. New clutch pipe and new throw out bearing. Then I would just need to order the $5 clutch tool and the Fw from Rockauto and that should be everything I need.

 

Sounds like a plan man! Thankfully I didn't have to buy most of those parts since I had a brand new trans to put in

 

I'm not going to address the resurfacing question because people don't like my answer.

The difference between lnf and lsj flywheels is the diameter of the dowel pins. If you have an lsj flywheel and want to mate an lnf clutch then you can do the "Bic pen trick" that I believe CED has on their website.