BA.
TYF Newbie
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- Jan 20, 2011
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I've been plodding away at trying to pinpoint the cause of my 2003 Tahoe Z71 vibration.
It's most noticeable between 25mph and 60mph where it starts to trail off. Keeping 70mph+ seems a good alternative for now. It also causes a bit of a resonance between 40mph-55mph. Sort of a WAH-WAH-WAH low resonance.
I've owned the truck for just over 2 years / 20,000 miles and this just spontaneously started about a month ago when we had a brief cold-snap of 15-20 degrees. Nothing new for this truck though.
After hoping and checking on the easier things.....
-New tank of fresh gas. Too easy.
-Spark plugs and wires checked.....
-Happens in OD,.....and 3rd gear and 2nd gear at the MPH's noted above.
-GOES AWAY with the very slightest of deceleration! Consistently, no matter the speed where decel is started.
-Slightly less noticeable under heavy acceleration over moderate acceleration.
-Happens under steady-state speed at the speeds noted above.
-Wheels & Tires removed and balanced and checked for separated belts. (Firestone)
(only 1 year, 10k miles, stock sz)
-added a can of transmission (converter) anti-shudder.
-happens in either 4-Auto or 2WD. (4WD button function inoperative for long time)
-have not had opportunity to swap wheels with anyone.
-was going to swap rear U-Joint but the shop had driveshaft out and said it didn't need it.
when on a lift, the rear of the driveshaft was rock solid, wouldn't move.
-The rear driveshaft yoke where it goes into the transfer-case moves a little and clunks a little.
IS THAT NORMAL? The U-joint itself seems fine and the noise seems to be inside the transfer case.
So, here is the VIDEO, even though it's as much about the AUDIO!
23Mb - may take a few seconds to download.
http://www.media-swap.com/2003_Tahoe_driveshaft.mp4
Any other ideas are welcome!
It's most noticeable between 25mph and 60mph where it starts to trail off. Keeping 70mph+ seems a good alternative for now. It also causes a bit of a resonance between 40mph-55mph. Sort of a WAH-WAH-WAH low resonance.
I've owned the truck for just over 2 years / 20,000 miles and this just spontaneously started about a month ago when we had a brief cold-snap of 15-20 degrees. Nothing new for this truck though.
After hoping and checking on the easier things.....
-New tank of fresh gas. Too easy.
-Spark plugs and wires checked.....
-Happens in OD,.....and 3rd gear and 2nd gear at the MPH's noted above.
-GOES AWAY with the very slightest of deceleration! Consistently, no matter the speed where decel is started.
-Slightly less noticeable under heavy acceleration over moderate acceleration.
-Happens under steady-state speed at the speeds noted above.
-Wheels & Tires removed and balanced and checked for separated belts. (Firestone)
(only 1 year, 10k miles, stock sz)
-added a can of transmission (converter) anti-shudder.
-happens in either 4-Auto or 2WD. (4WD button function inoperative for long time)
-have not had opportunity to swap wheels with anyone.
-was going to swap rear U-Joint but the shop had driveshaft out and said it didn't need it.
when on a lift, the rear of the driveshaft was rock solid, wouldn't move.
-The rear driveshaft yoke where it goes into the transfer-case moves a little and clunks a little.
IS THAT NORMAL? The U-joint itself seems fine and the noise seems to be inside the transfer case.
So, here is the VIDEO, even though it's as much about the AUDIO!
23Mb - may take a few seconds to download.
http://www.media-swap.com/2003_Tahoe_driveshaft.mp4
Any other ideas are welcome!
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