Vibration
Thread Starter
Cruising
Joined: Jul 2015
Posts: 14
Likes: 0
Vibration
I have a 2013 lt2 coupe auto trans. When driving around 60 mph and lift off on the gas, I get this vibration I can feel a vibration. When I get back on the gas there is also some vibration but goes away as speed increases. It does not happen at lower or higher speeds. Any Ideas??
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
So, driving steady 60, no vibration? If so, then backing off, or getting back on the gas changes the speed just slightly so that something triggers it--not 60 itself. Have you hit anything lately, like a curb, a bad pothole, RR tracks, etc.? Did this just start out of the blue? When? How many miles now on the car? Anything done to the car recently, like at a dealer, tire store, up on a lift? First ck is wheel/tire balance. Second ck is make sure all lug nuts are tightened to 100 lb/ft. Next might be even wheel bearing check. Altho unusual, it could be motor mounts (kind of early to happen tho).
Racer
Joined: Mar 2015
Posts: 285
Likes: 6
Is it in a particular gear? If yes it's transmission related. If not, put the car on jack stands transmission in park, E brake off. Turn each rear wheel by hand and check for excessive play in rear axles. Remove lower flexplate housing and check driveshaft also.
Thread Starter
Cruising
Joined: Jul 2015
Posts: 14
Likes: 0
Vibration
So, driving steady 60, no vibration? If so, then backing off, or getting back on the gas changes the speed just slightly so that something triggers it--not 60 itself. Have you hit anything lately, like a curb, a bad pothole, RR tracks, etc.? Did this just start out of the blue? When? How many miles now on the car? Anything done to the car recently, like at a dealer, tire store, up on a lift? First ck is wheel/tire balance. Second ck is make sure all lug nuts are tightened to 100 lb/ft. Next might be even wheel bearing check. Altho unusual, it could be motor mounts (kind of early to happen tho).
Race Director
Joined: Oct 2005
Posts: 14,999
Likes: 200
From: Bay Area Ca.
Aline after new tires. The wear pattern is set up already. Depending on just how much wear has taken place you could squeeze out a few more miles with an alinement now. If the tires have 14,000 I would wait. Just depends of the condition and amount of wear.
I would not mix rf with non rf only because of the handling differences between the two. If you are a around town commute driving then ok, I guess. But if you like to push the car some in the turns I would advise keeping with same type tire in all four corners. having to do with grip and responsiveness of the different tires.
The tire mix should only be a temporary fix and not something to do as a recommended usual procedure. it would not be the end of the world but in a performance car it does represent a mismatch. Again granny going to Sunday church ok, driving aggressively a no no.
I would not mix rf with non rf only because of the handling differences between the two. If you are a around town commute driving then ok, I guess. But if you like to push the car some in the turns I would advise keeping with same type tire in all four corners. having to do with grip and responsiveness of the different tires.
The tire mix should only be a temporary fix and not something to do as a recommended usual procedure. it would not be the end of the world but in a performance car it does represent a mismatch. Again granny going to Sunday church ok, driving aggressively a no no.
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Burning Brakes
Joined: Jun 2015
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From: Shelbyville Kentucky
Safety Car
Joined: Nov 2007
Posts: 4,433
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From: Bay Area CA
Aline after new tires. The wear pattern is set up already. Depending on just how much wear has taken place you could squeeze out a few more miles with an alinement now. If the tires have 14,000 I would wait. Just depends of the condition and amount of wear.
I would not mix rf with non rf only because of the handling differences between the two. If you are a around town commute driving then ok, I guess. But if you like to push the car some in the turns I would advise keeping with same type tire in all four corners. having to do with grip and responsiveness of the different tires.
The tire mix should only be a temporary fix and not something to do as a recommended usual procedure. it would not be the end of the world but in a performance car it does represent a mismatch. Again granny going to Sunday church ok, driving aggressively a no no.
I would not mix rf with non rf only because of the handling differences between the two. If you are a around town commute driving then ok, I guess. But if you like to push the car some in the turns I would advise keeping with same type tire in all four corners. having to do with grip and responsiveness of the different tires.
The tire mix should only be a temporary fix and not something to do as a recommended usual procedure. it would not be the end of the world but in a performance car it does represent a mismatch. Again granny going to Sunday church ok, driving aggressively a no no.
Depends on how much tread is left on the worn tire. If the wear bars are showing, them replace tires and align. If you have around 4k miles left, I would do an alignment now and buy new tires later. It is not recommended to mix and match tires.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Aline after new tires. The wear pattern is set up already. Depending on just how much wear has taken place you could squeeze out a few more miles with an alinement now. If the tires have 14,000 I would wait. Just depends of the condition and amount of wear.
I would not mix rf with non rf only because of the handling differences between the two. If you are a around town commute driving then ok, I guess. But if you like to push the car some in the turns I would advise keeping with same type tire in all four corners. having to do with grip and responsiveness of the different tires.
The tire mix should only be a temporary fix and not something to do as a recommended usual procedure. it would not be the end of the world but in a performance car it does represent a mismatch. Again granny going to Sunday church ok, driving aggressively a no no.
I would not mix rf with non rf only because of the handling differences between the two. If you are a around town commute driving then ok, I guess. But if you like to push the car some in the turns I would advise keeping with same type tire in all four corners. having to do with grip and responsiveness of the different tires.
The tire mix should only be a temporary fix and not something to do as a recommended usual procedure. it would not be the end of the world but in a performance car it does represent a mismatch. Again granny going to Sunday church ok, driving aggressively a no no.
And with Mike's LS3 too. A good (experienced) alignment tech will be able to see the current wear pattern and compensate for it, rather than just only referring to a spec sheet that doesn't resolve your problem. Adding a couple extra PSI in the fronts will help get you more miles too, before needing new tires.My first thought on your vibration was the converter clutch dropping out of and back into lockup mode. If you watch the tach when you let off the throttle at a steady speed in 6th gear, you'll see it drop from around 1200-1400 to 600. There will be a vibration just as the RPM begins to drop. There will also be a vibration as the clutch hooks up again when you add some throttle to resume your speed. You probably won't feel much vibration if you add a lot of throttle or if your speed drops so much that it's no longer in the range for 6th gear.
This is just the way the transmission works. Mine has 126K miles and still works that way, just to show you it's not a problem.
Now if you have severe cupping on those front tires, that could indicate other suspension issues that could also cause a vibration and an alignment and/or new tires won't resolve that one.
Last edited by HOXXOH; Aug 19, 2015 at 04:42 PM.
