Question about 2003 GMC Envoy
Vehicle has a vibration or shudder (seems to be in the drivetrain) at 60 to 80 KM / hr mostly if you give is a little gas or make it work a little going up hill. It disappears or is reduced at lower or higher speeds or if you take you foot off the gas and coast
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Posted on Jan 02, 2017
I had a similar problem with my 2005 Envoy. It turned out that the bearings had to be replaced. Both sides. I hope its not your problem, it was expensive.
Posted on Dec 27, 2008
Have your tires checked for any unusual wear or pitting and make sure that they are balanced right. If they are even just a little bit out of balance it can cause your back end to vibrate. Hope this helps. Good luck!
Posted on May 05, 2009
I would be more inclined to look at the U-joints at either end of the drive line. Bent tubes usually cause vibration at speed. Jack up both rear wheels and put gearbox in neutral. Spin the wheels by hand and observe the drive line for being bent as it turns. A rare problem which allows the rear axle to twist under acceleration might be possible.
Posted on Jul 17, 2009
your highway acceleration problem could be a coil problem. Not sure if that year of chev has coil packs or not but experienced same thing with ford 5.4L. went through 3 coil packs and did the same thing each time before biting the dust. Transmission seems to be sticking on the 1to2 upshift and could be a sticking solenoid in the valve body of the tranny. If the shifting problem persists then the tranny deffinately has to be rebuilt. It's made it quite far if tha is the original tranny, you cant expect too much life out of it if it has been worked hard. I highly doubt a fluid change would help at all. Or if you want, you can buy a can of new truck from GM for about 25 to 35 thousand bucks! Typically works great!
Posted on Oct 19, 2009
Usually a vibration is due to one or more parts that have become worn or damaged. I'm not sure why you mentioned the tires but don't disregard them unless you know that they are fine. Check for correct inflation (on the door jam), for uneven tread wear, or bubbles and damage.
Other things that can cause a vibration is the front-end needing an alignment, a tire that is unbalanced, worn out steering components (like a wheel-bearing), defective u-joints and/or an unbalanced drive-shaft, or low gear-oil level in the drive-axle can cause damage to the ring & pinion gear. The damage would primarily be on one side. So when you let off the gas pedal the sound goes away. Check as much as you can and let me know how it is going.
Posted on May 21, 2010
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