Also had the same problem with a CF Dual Friction clutch. Weights slung off center and refusing to center. Went to a McLeod, problem solved.

 

My sincere apologies to you and everyone else, but JohnfromVentura wasn't really asking a question. He was just making another slam as he is wont to do, and since I have personally explained the driveshaft issue in reply to John's slams before my fuse is pretty short with John.

 

Robert,
The CF is a place where Corvette owners share information, tips and experiences for the mutual benefit of resolving problems. This man has a drive train balance problem and is looking for help. I'm sorry that you have a short fuse! Both of the wrong drive shafts that you sent me were not balanced at all. I'm not sure or care how this plays into the owner’s inspection of your driveshaft vendors balancing equipment. About the same time on many CF forums people were complaining about keisler unbalanced driveshaft issues. It appears that you only fixed the problems when people complained. Many people still have your transmissions conversions waiting under their work benches for a chance to install them or don't belong to this forum so they aren’t aware of your "don't complain=don't fix policy". Is it correct that you didn't do a recall on ALL of the drive shafts produced during the suspect period? I understand that you have resolved all of your internal problems so there is no reason to pound that drum! Please don't try to blow me away with your outbursts.

 

Actually johnfromventura:
We did do a recall on all suspected driveshafts that were shipped out during that short period of time. If someone out there still has their kit under the bench waiting to install and received their kit from us last August, if we haven't already contacted you, please contact us and we will have the driveshaft checked out. To our knowledge, we contacted everyone from that time period. It really gets old John, reading this forum and noticing you never have anything helpful to say until someone questions Keisler then you are all over it putting your .02 in. Here's a thought, unless you have something usefull to say (even constructive critisizm) don't bother saying anything at all.
Once again, to everyone out there who received one of our kits last August, If you were not contacted by us about your driveshaft, please contact me at 865-609-8187 ext. 201 and I will take care of it.

Richard
Tech Support/Customer Service
Keisler Engineering

 

I have the same problem with my stock 4 spd in my '77, the shifter will vibrate and rattle at anything above 3000 rpm, in any gear or neutral....is the likely culprit the clutch & flywheel, or bad engine/tranny mounts??

On a side note: I wish some people would just grow up....I have read almost every post on the CF forum (c3 sections) for the past year, and it is the same bickering back and forth....get over it! I think Keisler is looking to pick a fight, John just informed the guy that you had a small issue with the unbalanced driveshafts in the past (some people may not be aware), he did not go on the offensive and slam you.

 

davidm_comp:
Actually, what john was insinuating was that we knew we had driveshaft balancing issue and did nothing to resolve it. That is simply not true. After the initial problem was discovered, we spent nearly a month recalling the suspect driveshafts or issueing refunds to customers who had already taken care of the problem themselves. If you have been following this forum for the past year, then you are well aware of the problems John encountered trying to install our kit. You must also be aware of the great lengths we went to to remedy his situation. You can't please everyone all of the time, but lord knows we sure try to.
I do not like getting into pi--ing contests with forum members and am only here to offer help and advice to past, present and future customers. If I offended you, I am sorry. We do not go looking to pick fights with anyone, only to defend ourselves against blatant outright lies and accusations.

Richard
Tech Support/Customer Service
Keisler Engineering

 

I have a Centerforce clutch and I was concerned to read that some people had out of balance problems with the clutch. The Centerforce clutch has a wire ring that loosely fits around the diaphram fingers, the center of the wire ring coincides with the transmission shaft. The wire ring has weights installed along the circumference. As engine rpm increases, centrifugal force causes the weights to clamp the clutch disk tighter - a good idea. The wire ring is loose - you can move it back and forth sideways with your fingers, and if you want you can install it in a grossly unbalanced position. However, the ring is designed to be self centering. Increase rpm and the ring will self balance.

Why do some Centerforces have a balance problem? I called Centerforce. They were very responsive. The engineer I talked with said that if the engine was not balanced well, if the engine vibrated, then the Centerforce wire ring self balancing function would not work - engine vibration would prevent the ring self centering. After hearing this I decided to use my Centerforce. Also, the GM Performance Parts catalog carries the Centerforce clutchs, so they must be well thought of by GM performance people.

Bottom Line (as I understand it): If you have an engine unbalance problem and a Centerforce clutch, the Centerforce can amplify the engine unbalance problem.

 

Don't know about Keisler "picking a fight",but they sure are very defensive.....in fact,I think to much...

 

Question has Keisler always balanced the driveshaft? If so what are the chances of a driveshaft not requiring weight?

 

I've had my Keisler kit installed four months now, driveline smooth as a babys butt.

 

Don't want to hijack but I have found Keisler to be excellent tech support and a good quality product.

 

Properly manufactured, no driveshaft would need a counterweight.

 

Yes sir, we have.

 

I sure hate sounding defensive, and it gives me a headache to have to get into a verbal street fight on the forum or anywhere else for that matter....

..... but when someone gets on here and says something that is untrue and damaging to my friend's business, I cannot just let it go. It's not like when someone gets mad at you and says something unkind to you over the phone. On the forum it is posted for all of the world to read for next several years. It is particularly a problem when the person repeats the same false statement even after you have explained to him that he is mistaken.

On the other hand, when someone has a genuine problem, we are very eager to help solve the problem.

I would just love to get back to talking about Vettes now

 

I owe an apology to Keisler for improperly titling this thread. "Keisler Vibration" implies that the problem is in the Keisler trans or that they sold me a defective product with poor or no follow up support.

In fact, the opposite appears to be true. I don't think the vibration is inside the trans, Keisler replaced my driveshaft with a rebalanced one with smaller u joints at no charge including shipping and was very responsive via email and phone.

As per my reply above, I now think the vibration is in the flywheel/clutch assembly not the trans or drive shaft.

Again, apologies to Keisler.

 

[QUOTE=Robert Hall -

I would just love to get back to talking about Vettes now[/QUOTE]