rhythmic vibration-
Thread Starter
Pro
Joined: Oct 2006
Posts: 654
Likes: 1
From: Prescott Valley Arizona
rhythmic vibration-
Need info- my 98 auto has new GSD3s and wheels and has been balanced very carefully. At 70 mph I begin to get a rhythmic vibration from the rear (feel it in the seat not steering wheel). It becomes more pronounced at 90mph and more constant. Has anyone out there had a similar situation. It became noticeable on an extremely smooth stretch of I/S 40 and not out on California's cobblestone roads.
Le Mans Master
Joined: May 2006
Posts: 5,987
Likes: 18
From: DuBois PA
St. Jude Donor '11-'12-'13-'14-'15
Man… This is popping up a lot lately! I had the same vibration after new wheels were installed and it was a bad tire. The tire shop couldn’t find anything wrong but a Road Force Balance machine found the bad RR tire. If it wasn’t road force balanced, have that done. If you still have the vibration have all your wheel bearings checked. Next I would check the torque tube… there’s a procedure for “centering” the torque tube (link below) but unless you’ve had it off I doubt if that’s the problem.
http://forums.corvetteforum.com/show....php?t=1542960)
Please let the Forum know what it turns out to be….
http://forums.corvetteforum.com/show....php?t=1542960)
Please let the Forum know what it turns out to be….
Pro
Joined: Jul 2006
Posts: 652
Likes: 0
From: Carthage NY
My vibration is in the seat only, and only happens around 90-95mph.
I've got chrome repros, but the guy that balanced them said he didn't have a problem balancing them.. Hmm.. Now I'm wondering if I should go somewhere else and get them re-balanced.
Racer
Joined: Mar 2006
Posts: 270
Likes: 0
From: los altos ca
Does the torque tube need to be centered? I recently had mine off, and there were no alignment dots.....I put them back on by just slipping them back in....the vibration still was there before and after i pulled the arms, this was the first time they had been off....I was starting to suspect that flat spot from sitting....but it seems like the vibration would come at any speed if that were the case...anyhow I hope you find your problem Burgie since i have it too, ill let you know if i come across anything........One other thing i noticed is that this problem started after most people changed their stockers to aftermarket wheels without the runflats.......which is my case also
Last edited by Ducati749; Nov 27, 2006 at 01:36 PM.
Race Director
Joined: Dec 2002
Posts: 10,233
Likes: 21
From: Baltimore suburbs Maryland
Rims could be bent (I had that problem with my magnesiums), or the tire is out of round. Could also be wheel bearing, CV shaft, etc.
You can visually inspect the tire/rim by jacking the rear of the car up and supporting properly, so the tires dont touch, shut off the Trac Control, then put it in 3rd gear and let it idle forwards. Do not breath the exhaust. Then, carefully watch the rims and tires. If there is any singificant whomp or variation you'll see it as the wheel rotates.
Road force balance = Hunter GSP9700.
www.gsp9700.com to find one. I warn you though, just cause a shop has one, doesn't mean they know how to operate it properly. Don't ask me how I know
You can visually inspect the tire/rim by jacking the rear of the car up and supporting properly, so the tires dont touch, shut off the Trac Control, then put it in 3rd gear and let it idle forwards. Do not breath the exhaust. Then, carefully watch the rims and tires. If there is any singificant whomp or variation you'll see it as the wheel rotates.
Road force balance = Hunter GSP9700.
www.gsp9700.com to find one. I warn you though, just cause a shop has one, doesn't mean they know how to operate it properly. Don't ask me how I know
Team Owner
Joined: May 2005
Posts: 23,682
Likes: 9
From: Flagstaff Az.
Originally Posted by Burgie
Thanks for the info on the Road Forced Balance, but just what and how is that done. Most of the shops around Havasu use the Computerized Spin Balance-
Race Director
Joined: Nov 2001
Posts: 18,682
Likes: 4
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12
Originally Posted by ericdwong
Rims could be bent (I had that problem with my magnesiums), or the tire is out of round. Could also be wheel bearing, CV shaft, etc.
You can visually inspect the tire/rim by jacking the rear of the car up and supporting properly, so the tires dont touch, shut off the Trac Control, then put it in 3rd gear and let it idle forwards. Do not breath the exhaust. Then, carefully watch the rims and tires. If there is any singificant whomp or variation you'll see it as the wheel rotates.
Road force balance = Hunter GSP9700.
www.gsp9700.com to find one. I warn you though, just cause a shop has one, doesn't mean they know how to operate it properly. Don't ask me how I know
You can visually inspect the tire/rim by jacking the rear of the car up and supporting properly, so the tires dont touch, shut off the Trac Control, then put it in 3rd gear and let it idle forwards. Do not breath the exhaust. Then, carefully watch the rims and tires. If there is any singificant whomp or variation you'll see it as the wheel rotates.
Road force balance = Hunter GSP9700.
www.gsp9700.com to find one. I warn you though, just cause a shop has one, doesn't mean they know how to operate it properly. Don't ask me how I know
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Le Mans Master
Joined: May 2006
Posts: 5,987
Likes: 18
From: DuBois PA
St. Jude Donor '11-'12-'13-'14-'15
Originally Posted by Ducati749
Does the torque tube need to be centered? I recently had mine off, and there were no alignment dots.....I put them back on by just slipping them back in....the vibration still was there before and after i pulled the arms, this was the first time they had been off....I was starting to suspect that flat spot from sitting....but it seems like the vibration would come at any speed if that were the case...anyhow I hope you find your problem Burgie since i have it too, ill let you know if i come across anything........One other thing i noticed is that this problem started after most people changed their stockers to aftermarket wheels without the runflats.......which is my case also
1st according to the post I referenced above, if the Torque Tube (TT) is it removed it should be “re-centered” by the procedure shown in that post. No alignment dots or such, as the drive-train spins the TT will automatically come to center, then just tighten the clamp back up.
2nd You are talking about “them” and “arms” are we talking about the wheel to differential half-shafts or the TT???? The half-shafts do not require any type of centering or alignment.
I had chrome Y2Ks installed with the original run flats. I suspect that the tire shop that installed the wheels messed up one of the run flats getting it off and on, can’t prove it but….
Hope that helps.
Thread Starter
Pro
Joined: Oct 2006
Posts: 654
Likes: 1
From: Prescott Valley Arizona
In retrospect, I changed from the run-flats to non and the new wheels. The run flats were hard and appeared to pick up every bump in the road or were out of balance as the mirror constantly vibrated. This car may have had it all along. I'm still going to take it in for a road forced balance. Thanks for the replies and will keep searching for an answer.
Racer
Joined: Mar 2006
Posts: 270
Likes: 0
From: los altos ca
Originally Posted by Burgie
In retrospect, I changed from the run-flats to non and the new wheels. The run flats were hard and appeared to pick up every bump in the road or were out of balance as the mirror constantly vibrated. This car may have had it all along. I'm still going to take it in for a road forced balance. Thanks for the replies and will keep searching for an answer.
Thread Starter
Pro
Joined: Oct 2006
Posts: 654
Likes: 1
From: Prescott Valley Arizona
Out here I/S 40 is pretty flat and smooth unlike those Madonna Roads (concrete) in California and thus balance problems are more likely to rear their ugly head.
As for flat spots developing while sitting, both the run flats and non-run flats will develop flat spots if sitting long enough. Most of our driving is on the weekends with the vet, thus I don't even pay attention to the first twenty miles or so of balance issues.
I've located a forced road balance outfit here in Havasu for 20 bucks a wheel (YIKES) but his remark was the machine cost $14000.00 I told him I didn't want to buy it, just make sure it worked. We'll see him next month for the rears- I'll advise.
As for flat spots developing while sitting, both the run flats and non-run flats will develop flat spots if sitting long enough. Most of our driving is on the weekends with the vet, thus I don't even pay attention to the first twenty miles or so of balance issues.
I've located a forced road balance outfit here in Havasu for 20 bucks a wheel (YIKES) but his remark was the machine cost $14000.00 I told him I didn't want to buy it, just make sure it worked. We'll see him next month for the rears- I'll advise.
Racer
Joined: Mar 2003
Posts: 277
Likes: 4
From: Halfmoon New York
how to check for excessive play in bearings, etc...
Hey, that's the first time I've had one of my posts referenced, I feel so proud !
Who can give us some info on how to check for excess play in the bearings and half shafts/joints? I'm still trying to find someone local to Albany NY that has an old set of crap tires that I can try, but in the mean time I'm thinking I can jack it up and check for other obvious things. Burgie, did you have any other work done? Mine started when I had my rear pumpkin replaced with 3.42 (from 2.73). BTW mine is also a 98 auto.
Who can give us some info on how to check for excess play in the bearings and half shafts/joints? I'm still trying to find someone local to Albany NY that has an old set of crap tires that I can try, but in the mean time I'm thinking I can jack it up and check for other obvious things. Burgie, did you have any other work done? Mine started when I had my rear pumpkin replaced with 3.42 (from 2.73). BTW mine is also a 98 auto.
Pro
Joined: Oct 2002
Posts: 586
Likes: 0
From: Idabel OK
Mine started the 'rhythmic vibration', as described in the 1st post, following a trip over a curb(showing out and lost it). I am convinced that the wheel bearings must be the culprit!? The car seems to get the vibration at speeds over 60MPH and sort of cycles. It does get worse and more constant at higher speeds.
I have had the wheels and tires rebalanced and it made no difference. I also had the car realigned, which it needed after the incident, but it did not fix the 'rhythmic vibration'. I am also noticing increased vibration during braking as well. The braking issue did not come up immediately following the incident, but has gradually come about since.
I have had the wheels and tires rebalanced and it made no difference. I also had the car realigned, which it needed after the incident, but it did not fix the 'rhythmic vibration'. I am also noticing increased vibration during braking as well. The braking issue did not come up immediately following the incident, but has gradually come about since.
Le Mans Master
Joined: Sep 2004
Posts: 5,707
Likes: 4
From: Los Angeles
Originally Posted by stngh8r
Mine started the 'rhythmic vibration', as described in the 1st post, following a trip over a curb(showing out and lost it). I am convinced that the wheel bearings must be the culprit!? The car seems to get the vibration at speeds over 60MPH and sort of cycles. It does get worse and more constant at higher speeds.
I have had the wheels and tires rebalanced and it made no difference. I also had the car realigned, which it needed after the incident, but it did not fix the 'rhythmic vibration'. I am also noticing increased vibration during braking as well. The braking issue did not come up immediately following the incident, but has gradually come about since.
I have had the wheels and tires rebalanced and it made no difference. I also had the car realigned, which it needed after the incident, but it did not fix the 'rhythmic vibration'. I am also noticing increased vibration during braking as well. The braking issue did not come up immediately following the incident, but has gradually come about since.
Pro
Joined: Oct 2002
Posts: 586
Likes: 0
From: Idabel OK
Originally Posted by robvuk
Bent rim?
Upon visual inspection there was only a tiny knick on one of the rims. since the rims are repos and made out of some heavy junk alloy, I dont think this is the case. I did hit one hard enough one time to bend it, but it didnt really bend, it just split.
EE
Le Mans Master
Joined: May 2006
Posts: 5,987
Likes: 18
From: DuBois PA
St. Jude Donor '11-'12-'13-'14-'15
Originally Posted by Burgie
Out here I/S 40 is pretty flat and smooth unlike those Madonna Roads (concrete) in California and thus balance problems are more likely to rear their ugly head.
As for flat spots developing while sitting, both the run flats and non-run flats will develop flat spots if sitting long enough. Most of our driving is on the weekends with the vet, thus I don't even pay attention to the first twenty miles or so of balance issues.
I've located a forced road balance outfit here in Havasu for 20 bucks a wheel (YIKES) but his remark was the machine cost $14000.00 I told him I didn't want to buy it, just make sure it worked. We'll see him next month for the rears- I'll advise.
As for flat spots developing while sitting, both the run flats and non-run flats will develop flat spots if sitting long enough. Most of our driving is on the weekends with the vet, thus I don't even pay attention to the first twenty miles or so of balance issues.
I've located a forced road balance outfit here in Havasu for 20 bucks a wheel (YIKES) but his remark was the machine cost $14000.00 I told him I didn't want to buy it, just make sure it worked. We'll see him next month for the rears- I'll advise.