4spd shift rattle, leason learned
Thread Starter
Drifting
Joined: Apr 2002
Posts: 1,720
Likes: 19
From: Manhattan Beach Ca
4spd shift rattle, lesson learned
I had bad rattle at high rpm around 75 to 80 mph that I was chasing and could never figure it out. Tried shimming, drive shaft, tires all the things we discussed in the past. Turns out it was bad motor mount on one side. You would never have been able to tell mount was bad by inspection. Only in your hand when you push two halfs together, if they touch you know its bad. No obvious cracks or anything.
My rebuild with 262 cam is running great and now no rattling. It's such a good feeling when everything is working right! :yesnod:
[Modified by Surfer69, 8:35 AM 8/12/2003]
[Modified by Surfer69, 8:44 AM 8/12/2003]
My rebuild with 262 cam is running great and now no rattling. It's such a good feeling when everything is working right! :yesnod:
[Modified by Surfer69, 8:35 AM 8/12/2003]
[Modified by Surfer69, 8:44 AM 8/12/2003]
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
Re: 4spd shift rattle, lesson learned (Surfer69)
I have the exact same thing. I can feel it in the column too, but the worst of the noise comes through the shifter. I'd assumed it was either my mounts or balancer. Good to know that new mounts took care of it for you.
Pro
Joined: Sep 2002
Posts: 541
Likes: 5
From: Epping NH
Re: 4spd shift rattle, lesson learned (Surfer69)
I have had the same problem with my 69 350 (with a Hurst shifter). Once I hit about 2500 RPM the shifter rattles loudly. Interestingly, I found that the noise seemed to be coming from the plastic ball vibrating, so I take it off when I hit the highway. This quiets things down a bit but is not an acceptable alternative. For those with the same set up, you know there is a nut below the ball which helps orient the ball shift pattern. This past weekend I decided to replace the old nut with a new shiny one. As it turned out, the new nut has a wider diameter than the old nut and when I screwed the ball down, it seemed to catch and hold the ball in place better. When I drove my car, the vibration disappeared. This 10 cent fix has given me great joy!
Mark
Mark
Pro
Joined: Sep 2002
Posts: 541
Likes: 5
From: Epping NH
Re: 4spd shift rattle, lesson learned (wcsinx)
No, actually I am just a lousy speller. I have attempted to change my profile several times but have been unable to figure it out. I came to the conclusion that I may have to create a new account so I gave up trying. Any suggestions??
Mark
Mark
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
Re: 4spd shift rattle, lesson learned (Burgandy 69)
No, actually I am just a lousy speller. I have attempted to change my profile several times but have been unable to figure it out. I came to the conclusion that I may have to create a new account so I gave up trying. Any suggestions??
Mark
Mark
Team Owner
Joined: Aug 1999
Posts: 42,487
Likes: 47
SPARTAN
CI 3-4-5-6-8-9-10 Vet
CI-9 AutoX Winner
CI-3 Go Kart Champ
St. Jude '03-'04-'05-'06-'07-'08-'09-'10-'11
Re: 4spd shift rattle, lesson learned (wcsinx)
No, actually I am just a lousy speller. I have attempted to change my profile several times but have been unable to figure it out. I came to the conclusion that I may have to create a new account so I gave up trying. Any suggestions??
Mark
I know it can be done. You probably have to talk to a mod though.
Mark
I know it can be done. You probably have to talk to a mod though.
Cool on the shifter rattle. I have the same thing. Maybe I need to check those motor mounts. I'll do that AFTER I get a new driveshaft.
Melting Slicks
Joined: Nov 2000
Posts: 2,507
Likes: 114
From: St. Louis Mo
Re: 4spd shift rattle, lesson learned (Surfer69)
nteresting, mine rattles on the highway, but if I hold it or push down a little it will stop until I let go. Could this be the same thing? :confused: LT
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: 4spd shift rattle, lesson learned (Petes73)
OMG!!! I think if you were near me when I just read this post you would have literally seen a lightbulb light above my head.
On my old engine I had a bad vibration too. It was RPM specific in that it got bad at the top of each gear. On the highway sometimes it got so bad that it would shift the car out of gear. I had the rearmost bearing replaced in the transmission and for a while the vibration went away. But it came back shortly after and I attributed it to the engine. My harmonic balancer had twisted severly and was in bad need of replacement. I had all but forgotten about this and I am seeing vibrations again in the new engine. It is also RPM dependent. But I replaced all my motor mounts with Poly's.
Does anyone think it could be the frame? A crack or something? I visually inspected it when the engine was out and couldn't see anything.
But then again, with this much torque, I think if it was a crack it would have ripped the whole frame engine mount off by now. Aaaaggghhh, problems problems problems. :mad
On my old engine I had a bad vibration too. It was RPM specific in that it got bad at the top of each gear. On the highway sometimes it got so bad that it would shift the car out of gear. I had the rearmost bearing replaced in the transmission and for a while the vibration went away. But it came back shortly after and I attributed it to the engine. My harmonic balancer had twisted severly and was in bad need of replacement. I had all but forgotten about this and I am seeing vibrations again in the new engine. It is also RPM dependent. But I replaced all my motor mounts with Poly's.
Does anyone think it could be the frame? A crack or something? I visually inspected it when the engine was out and couldn't see anything.
But then again, with this much torque, I think if it was a crack it would have ripped the whole frame engine mount off by now. Aaaaggghhh, problems problems problems. :mad