THANK You again. I will let you know how I make out.

 

Nice ZO6. I was going to ask if you used LG because of you living in Dallas area. Then I looked at you photos out side of the LG shop.
I have LG headers & a Textralia clutch/flywheel from LG. I do not like the Textralia because of the chatter .
Thanks for the help.

 

There's a single long shift rod that goes from the shifter mechanism back to the transmission. This rod has 2 bends in it. When you try to force a shift, it flexes and twists, which winds up pushing the shift forks inside the transmission out of position. This causes the shifter to feel like it has found the gear, when it actually hasn't.

I would suggest that a larger diameter rod would be more rigid, and less apt to twist and bend under hard shifting conditions. Perhaps one of the aftermarket shifter manufacturers will jump on this and start offering a stiffer shift rod.

In the meanwhile, you could have a shop custom fabricate a larger diameter rod. Remember that stiffness is primarily a function of moment of inertia, larger diameter has a greater effect than material properties. In other words, a 6 inch diameter wooden log is stiffer than a half inch steel bar, not because wood is a stronger material, but because the log has a larger moment of inertia due to its diameter.

A hollow rod will be almost as stiff as a solid one, and much lighter. Making the shift rod twice the diameter will make it about 4 times as stiff, and if it is hollow, it can even weigh less than the original rod.

PS, I agree with Ranger that you can learn to shift around this, but actually fixing the problem would be even better.

 

Ranger, What do you think of this reply?
Gary

 

I had the exact same problem. While looking for shifter recommendations on the forum, I ran across Ranger's thread on the topic:

http://forums.corvetteforum.com/show...p?p=1555942210

I went from missing 3rd 20% of the time to not missing it at all and reaching the finals of our Corvette Challenge all from practicing. More details in the post above.

I recommend you follow Ranger's recommendation to practice. It sure worked for me. And it was a great Free mod!

 

Hi Gary,

I don't really have a basis to comment. Shopdog is describing issues he see with the design of the shift linkage in a C5/C6.

What I do know is this.

(1) I've never personally met a C5/C6 owner who was having 2-3 missed shift that weren't cured by resolving hand position on the shifter issues. I exclude from this guys whom I'd met too late and had already trashed their trannies.

(2) My C5s and C6 have always shifted fabulously well. I followed the shifting techniques and drills I've outlined here, taken care of the clutch fluid and never sensed any issue with the linkage whatsoever.

I acknowledge that a few members swear their trannies won't engage 3d but get neutral instead. I must admit that I've only read about and never met one. I'd like to, though. Just to see for myself if the root cause is the owner or the tranny (incl ShopDog's linkage design issue).

Ranger

 

Look for a service bulletin soon, expect an updated case assm. to be released. Would not suggest taking it in for any repairs until the bulletin and part number is released. As has been reported by ranger, if you change the way you shift it will go in properly.

 

Dear Chevtech, Could you please let me know when the bulletin is released. I have been practicing what Ranger has told us.
Gary

 

Be happy to. Supposed to be out soon, as I have been told the 07 cars have the updated case.

 

What do you mean "updated case" ? Do you know what the update/fix will be?

 

I was told an updated Transmission Case, which means the housing. Don't think that shift linkage, or rod, are changed but need to see what the bulletin says for the final word.

 

That does not sound like a fix for a shifting problem

 

Ridgity is necessary for shift linkage. Carbon fibre would make a nice link. The length isn't a primary concern but the bends that cause flexion are. Or course this may be a "fusable link" for the shift dogs/forks inside the case.

 

What?

 

Does anybody else feel that this is the clutch assembly problem, especially at high revs? In my C5 I never had an issue shifting into any gear. I have experienced this several times in my C6 from 2nd to 3rd, where you would have high revs. Check your VIN below to see if it is in the range, mine is unfortunately.

I hate to have this be my first post but it is... No matter, this car is so much better than my c5 it isn't funny and I thought that was (is) a great car!!!

Customer Satisfaction - Engine Flywheel/Clutch Interference #06523C - (05/02/2006)

EQUIPPED WITH 6.0L V8 (RPO LS2 - VIN U) OR 7.0L V8 (RPO LS7 - VIN E) ENGINE AND 6-SPEED (RPO MM6 or MZ6) MANUAL TRANSMISSION
THIS BULLETIN IS BEING REVISED TO ADD NEW INSPECTION STEPS TO THE "SERVICE PROCEDURE". EFFECTIVE UPON RECEIPT OF THIS BULLETIN, THE NEW INSPECTION PROCESS MUST BE USED. THE ORIGINAL INSPECTION PROCESS LABOR OPERATION (V1465) WILL NO LONGER BE ACCEPTED AFTER THIS DATE. PLEASE DISCARD ALL COPIES OF 06523b.

Condition
Certain 2006 Chevrolet Corvette model vehicles equipped with 6.0L V8 (RPO LS2 - VIN U) or 7.0L V8 (RPO LS7 - VIN E) engine and manual transmission may have a condition in which the flywheel may have been incorrectly machined, resulting in insufficient clearance for clutch cover self adjustment, reducing clutch life.

This program will expire on March 31, 2007.
Involved are certain 2006 Chevrolet Corvette model vehicles equipped with 6.0L V8 (RPO LS2 - VIN U) or 7.0L V8 (RPO LS7 - VIN E) engine and manual transmission and built within these VIN breakpoints:
Year Division Model From Through
2006 Chevrolet Corvette 65115878 65121354
Important: Dealers are to confirm vehicle eligibility prior to beginning repairs by using the GM Vehicle Inquiry System (GMVIS). Not all vehicles within the above breakpoints may be involved.

For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided through the applicable system listed below. Dealers will not have a report available if they have no involved vehicles currently assigned.
Parts Information

Parts required to complete this program are to be obtained from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order.
Part Number Description Qty/ Vehicle
12571611 Flywheel, Eng 1
Important: Due to the small number of vehicles involved and due to limited initial parts availability, dealers are encouraged not to order program parts for use as shelf stock. Parts should only be ordered when inspection determines that it is necessary to replace the flywheel.
Bad Flywheel/Clutch Plate Assembly w/shallow rim step to left of bolt/locating pin machined pad.

 

How many miles on your car and have you checked your clutch fluid?

Ranger

 

1200 miles and I think the fluid is ok but I will check and thanks for the tip! I did the palm shifting suggestion into third and that seems to be ok. However, in doing so you seem to be a little less aggressive and the revs aren't getting up there. I am trying to correlate high revs with the TSB and "sticky" clutch syndrome. Don't know if anybody else read this but Car and Driver mentioned the same exact issue when comparing the Vette to the GT500 about a month ago. Nice to see the Vette taking it to a 500HP car for almost the same price.

 

Found out that the factory is NOT going to release any fix for this issue. They were supposed to be releasing an updated case, flex when shifting is the cause. They say its NOT the shift rod. Have not checked to see if the 07 case is different then the 05-06 cars. An updated case was supposed to be in the 07 cars though.
If you use Ranger's advise it will work!!

 

So the '07s will be faster because you don't have to ease them into 3rd?

 

I shift my 06 every bit as fast as my 02 and 01. There is absolutely no need to be "easing" the shifter into any gear. Anyone with a shifting issue might wish to try the advice in this thread's post #15.

Ranger