Vibration at 30-35mph w/ '11 Tahoe

[TaHoeHoHo]

Hi, recently picked up 2011 used Tahoe LT - 12k miles. One thing I've noticed is pretty significant vibration at 30-35mph; almost as if truck is in wrong gear due to low RPMs.

If I go faster or slower, vibration disappears. Anyone know what may be causing this?

 

[HOE-N-IT]

Does it do it even if you are coasting at those speeds? If so it is probably not low RPM. It shouldn't vibrate even if the motor lugs but you can use manual mode to keep it in a lower gear and see if it still vibrates. You may also want the get the wheels/tires road forced balanced. The road force balancer also checks to see if a tire is out of round or has high spots. This can set up a vibration even at only certain speeds.

BTW I HATED my six speed until I got a Black Bear tune. Under light to moderate acceleration mine wanted to up shift way to soon and lug (but didn't vibrate) and then not downshift when needed unless I gave it a lot of gas. Now it always shifts at the right time for the throttle load, has more hang time in each gear and always down shifts when needed.

 

[edgaranah1]

Yeah u may want to balance your tires. Although I'm pretty sure a '11 tahoe shouldn't need it.

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[KMeloney]

If it's like my chugging/bogging/vibrating situation at the same speeds, then it's not a tire/wheel issue. It's something else. Don't know what yet, but it's no fun -- and mine is getting worse...

 

[GM Customer Service]

TaHoeHoHo,

I'm sorry you are having this problem. Have you taken your vehicle into the dealer for this issue? Your Tahoe is a 2011 and only has 12,000 miles on it, you should be under all of your warranties. Please let me know, thank you!

Evan, Chevrolet Customer Service

Hi, recently picked up 2011 used Tahoe LT - 12k miles. One thing I've noticed is pretty significant vibration at 30-35mph; almost as if truck is in wrong gear due to low RPMs.

If I go faster or slower, vibration disappears. Anyone know what may be causing this?

 

[TaHoeHoHo]

If it's like my chugging/bogging/vibrating situation at the same speeds, then it's not a tire/wheel issue. It's something else. Don't know what yet, but it's no fun -- and mine is getting worse...

I have a suspicion it's related to what HOE-N-IT said -- about it up-shifting too soon. It reminds me of the feeling a "manual/standard" tranny car drives like when you're in too-high-of-a-gear (for lower speeds).

 

[felixgun]

Does it do it even if you are coasting at those speeds? If so it is probably not low RPM. It shouldn't vibrate even if the motor lugs but you can use manual mode to keep it in a lower gear and see if it still vibrates. You may also want the get the wheels/tires road forced balanced. The road force balancer also checks to see if a tire is out of round or has high spots. This can set up a vibration even at only certain speeds.

BTW I HATED my six speed until I got a Black Bear tune. Under light to moderate acceleration mine wanted to up shift way to soon and lug (but didn't vibrate) and then not downshift when needed unless I gave it a lot of gas. Now it always shifts at the right time for the throttle load, has more hang time in each gear and always down shifts when needed.

I'm thinking I need to get a BB tune for my 6.2L/6 speed trans. I'm getting late shifting points in between gears which I've read about online and can be remedied via BBT.

 

[KMeloney]

I have a suspicion it's related to what HOE-N-IT said -- about it up-shifting too soon. It reminds me of the feeling a "manual/standard" tranny car drives like when you're in too-high-of-a-gear (for lower speeds).

That's exactly what it feels like. I've used that same exact description here before, too.

 

[DwDrummer]

It's in the rear end! My dads 08 Silverado did this and mine did too! It's very fustrating but the dealer didn't fix my dads truck. They blamed it on the wheel and tires being out of balance even replaced a tire I believe. He bought the truck new and to this day it's still doing it.

 

[edgaranah1]

Then I would say the six speed transmission sucks. Although I have felt that on my 4 speed to. It feels like it needs to be on another gear and feels like a loss of power. Is that what u guys are experiencing?

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