Nasty Vibration

Mike Voth · 06-21-2010, 03:47 PM

The Monte has developed a very bad vibration in high gear. Changed driveshafts and the problem seemed to lessen temporarily, but it's back as bad as before. The driveshaft is straight. Dad can barely hold the shifter back in 4th as he crosses the finish line. We are taking the tranny apart to see if the mainshaft is bent or ???. Can a ring gear be out of balance? We are sending the clutch and disk away to get balanced. Axles ???.

Any help would be appreciated as we're really scratching our heads on this one.

Many thanks in advance!!

W J · 06-21-2010, 04:36 PM

Just random thoughts, but 1, Make sure rear hasn't moved (string-measure both sides, center of front whl. to center of back whl.) 2, Pinion bearing going bad, or something moved inside rear? Good luck....WJ

RPinoski1 · 06-21-2010, 04:40 PM

Might have lost a wheel weight or two???????

cad · 06-21-2010, 04:50 PM

Several years ago, I had a front wheel/tire out of balance at Scribner that caused my vision to blur so bad that I could not see the scoreboards.
It shook everything in the car.
I had Joe Archer re-balance and cleared it up.

Adger Smith · 06-21-2010, 07:56 PM

Rear bushing in tranny or main shaft bearing.

Darrin Christen · 06-21-2010, 08:08 PM

Had a similar problem years ago. I had the drive shaft rebalanced, changed the bushing in the trans tail shaft housing, and also had the front and rear wheels rebalanced. Problem was still there, bad vibration about the last 300' of the track. Ended up breaking the trans case across the bell housing. I put a new Dedenbear trans case in the car and the problems was still there. By this time the rear tires needed replacing and bingo the problem went away. Smooth as glass with the new tires. Before this problem started the car had sat in the garage for two months while freshing the engine. I had neglected to put the car up on jack stands and I guess the rear tires got flat spots. Won't make that mistake again.

Stephen & Horace Johnson · 06-21-2010, 09:55 PM

Quote:

Originally Posted by Mike Voth

The Monte has developed a very bad vibration in high gear. Changed driveshafts and the problem seemed to lessen temporarily, but it's back as bad as before. The driveshaft is straight. Dad can barely hold the shifter back in 4th as he crosses the finish line. We are taking the tranny apart to see if the mainshaft is bent or ???. Can a ring gear be out of balance? We are sending the clutch and disk away to get balanced. Axles ???.

Any help would be appreciated as we're really scratching our heads on this one.

Many thanks in advance!!

I had the same issue on my 5speed mustang, it would vibrate so bad that it would jump out of gear as soon as i pulled into gear. It was my mainshaft that was bent. I took it to work and put it on jig and realize it was bent!!! I junked it and put a new one in, and never had the problem again.

Ed Carpenter · 06-21-2010, 09:57 PM

Mike I had the same thing last year. I could not hold the shifter in high gear. Pilot bearing came out in pieces when we dropped the can. Ed

Tracy Robbins · 06-21-2010, 10:00 PM

I had a similar situation when a couple of bell housing bolts had backed out earlier this year, sounds simple but it can happen.

Mike Voth · 06-22-2010, 09:16 AM

Quote:

Originally Posted by W J

Just random thoughts, but 1, Make sure rear hasn't moved (string-measure both sides, center of front whl. to center of back whl.) 2, Pinion bearing going bad, or something moved inside rear? Good luck....WJ

Housing is centered. Pinion bearing feels good and rotates smooth, but 3rd member is coming out tonight, so we'll see. Thanks

06-21-2010, 03:47 PM	#1
Mike Voth Live Reporter Join Date: Jun 2008 Location: Buhler, KS Posts: 527 Likes: 5 Liked 57 Times in 14 Posts	Nasty Vibration The Monte has developed a very bad vibration in high gear. Changed driveshafts and the problem seemed to lessen temporarily, but it's back as bad as before. The driveshaft is straight. Dad can barely hold the shifter back in 4th as he crosses the finish line. We are taking the tranny apart to see if the mainshaft is bent or ???. Can a ring gear be out of balance? We are sending the clutch and disk away to get balanced. Axles ???. Any help would be appreciated as we're really scratching our heads on this one. Many thanks in advance!! __________________ Mike Voth 5189 GTN - 5188 GTO Voth Racing

06-21-2010, 04:36 PM	#2
W J Senior Member Join Date: Jul 2009 Location: Paxton, Massachusetts Posts: 638 Likes: 0 Liked 0 Times in 0 Posts	Re: Nasty Vibration Just random thoughts, but 1, Make sure rear hasn't moved (string-measure both sides, center of front whl. to center of back whl.) 2, Pinion bearing going bad, or something moved inside rear? Good luck....WJ Last edited by W J; 06-21-2010 at 04:43 PM. Reason: splchek....

06-21-2010, 04:40 PM	#3
RPinoski1 Member Join Date: Jan 2002 Location: PLACERVILLE, CA Posts: 182 Likes: 0 Liked 0 Times in 0 Posts	Re: Nasty Vibration Might have lost a wheel weight or two???????

06-21-2010, 04:50 PM	#4
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 691 Likes: 188 Liked 87 Times in 48 Posts	Re: Nasty Vibration Several years ago, I had a front wheel/tire out of balance at Scribner that caused my vision to blur so bad that I could not see the scoreboards. It shook everything in the car. I had Joe Archer re-balance and cleared it up.

06-21-2010, 07:56 PM	#5
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Nasty Vibration Rear bushing in tranny or main shaft bearing. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 06-21-2010 at 07:57 PM. Reason: sp

06-21-2010, 08:08 PM	#6
Darrin Christen Member Join Date: Mar 2007 Location: Des Allemands, LA Posts: 365 Likes: 8 Liked 1 Time in 1 Post	Re: Nasty Vibration Had a similar problem years ago. I had the drive shaft rebalanced, changed the bushing in the trans tail shaft housing, and also had the front and rear wheels rebalanced. Problem was still there, bad vibration about the last 300' of the track. Ended up breaking the trans case across the bell housing. I put a new Dedenbear trans case in the car and the problems was still there. By this time the rear tires needed replacing and bingo the problem went away. Smooth as glass with the new tires. Before this problem started the car had sat in the garage for two months while freshing the engine. I had neglected to put the car up on jack stands and I guess the rear tires got flat spots. Won't make that mistake again. __________________ 4878 SS/GA 66CHEVY II

06-21-2010, 09:57 PM	#8
Ed Carpenter Live Reporter Join Date: May 2006 Location: Dripping Springs, Tx Posts: 2,709 Likes: 186 Liked 520 Times in 132 Posts	Re: Nasty Vibration Mike I had the same thing last year. I could not hold the shifter in high gear. Pilot bearing came out in pieces when we dropped the can. Ed __________________ Ed Carpenter 2005 Chevy Cobalt A/SM Race Engine Development

06-21-2010, 10:00 PM	#9
Tracy Robbins Senior Member Join Date: Dec 2001 Location: Youngsville, NC Posts: 846 Likes: 3 Liked 25 Times in 11 Posts	Re: Nasty Vibration I had a similar situation when a couple of bell housing bolts had backed out earlier this year, sounds simple but it can happen. __________________ Tracy Robbins SS 9766