My 2012 coupe was making noise at 30 miles new. Repaired at 300 miles now at 3200 making noise again. So no I don't think it has been improved.

 

Just order an SLP balancer and be done with it. I put a 25% underdrive on mine and gained .02-.03 in the quarter mile....

 

thats an 8 year old part number that is consistently failing on LS2's and the dew washer does not go on the crank bolt as you state in post 17. it goes on the rear of the harmonic balancer.

 

 

Is that part number for LS3? I've seen 12560115 but that may be for LS2 only.

 

For some reason Wayne can't seem to comprehend this simple situation and always brings up pinning the damn crank when ever the discussion of the balancer comes up.

 

OEM's design is simplicity and low cost while serving many functions. However, it is like jack of all trades and master of none. I have no personal observation on this "new" damper, but rest assure, if it still is joining inner/outer ring with an elastomer, then it is no better.

FYI, ATI Damper consist of many precision machined parts in the assembly. Use "O" rings for damping control, rebuild-able and depending on application, degree of damping control is possible with use of different density "O" rings from ATI.

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OP had posted his concern on both Technical and General Sections. I do know vendors cruise the Forums and often times see they jumped in and post to the effect of - "if you like new, call me and I like to earn your business". There is no vendor activity on both Sections!

So the inactivity is the admittance of the "new" OEM Damper being same? A picture is worth a thousand words. Certainly with a photo to confirm will not help anymore sale, if it is.

 

So funny!

Its like - here it comes!

 

I'm pretty sure every C6 engine uses the same part except for ZR1 and maybe Z06. Even brand new GS's are having to have it replaced.

 

And this probably isn't the first time I've contradicted him, I don't remember but I'm sure I have in the past.

 

I appreciate all the input from everyone, I am getting quite an education. I was first told about the "new" HB by the Corvette mechanic at a local dealer where I went for an inspection last week, he said he had been installing the new design units for awhile and had in fact installed one on his Vette. Wanting more info, I called 2 local independent and highly respected repair shops and asked both about the ATI unit which I was leaning towards, they BOTH recommended the new OEM unit, saying it was considerably cheaper and that GM had fixed the problems associated with the older ones. After posting my question on the forum, I got a PM from a friend who told me that his car was in the same dealer (that I used for the inspection) for warranty work including a HB and they would not put the old type balancer in his car, they kept it there for almost a month until the newly redesigned balancers arrived and installed one of those, this was back in April/May 2012. He also said he talked to a Chevrolet rep at Carlisle who acknowledged to him that Chevrolet knew they had problems with the old design and had redesigned the units and were using a new vendor to manufacture the parts. Hope this helps a little....that being said, I am going to talk to another mechanic about this but right now am leaning towards an ATI unit.
Thanks to all for your help!

 

I wonder if its possible that they kept the same part number and assigned it to the new part? I have pictures of my old one. I'd sure like to get a good look at the new one, if there is such a thing, and compare the two.

 

I'm not trying to hijack your post, but wondering what the estimated cost of this repair would be for someone who was out of warrantee...like me. 2006 vert with 17,000 miles.

 

I got 3 prices, all for OEM units, $1048 from dealer and $700 and $600 from two local repair shops.......ATI unit about $400 more.

 

At the dealer the bill came to $1339.58 and included the balancer, bolt, 2 belts and a 4 wheel alignment. Balancer $236, bolt $5.62, belts $76. Labor for the balancer was $825 and $169 for the alignment. I had extended warranty and only had to pay $300.

 

the ATI does have the elastomer rubber in it for dampening vibration and has a much better design to hold it in place. the elastomer rubber is also replaceable. the reason GM uses their design is cost. they are very inexpensive to produce. get what you pay for ring a bell?

 

p/n 12635652 is used on LS2's

 

p/n 12635652 is different from your old one. the dew washer will not fit on your original equipment hb. you can not tell by looking at it . measure it or try and put a dew washer on it.

 

I really have no reason to do either of those things since it makes no difference to me.

 

Had mine replaced Nov 2011, 2007 with ~65k miles under warranty. I have belt noise again in Dec 2012, a very, very slight wobble (barely even noticeable) and the dealership checks it out and says there is nothing they can do since everything is within spec. I figure I'll look at it once or twice a year and not worry about it.