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Suburban shakes on Highway

6745 Views 13 Replies 8 Participants Last post by  blackburb
I have a 2003 Chevy Suburban 2500 4x4 with 8.1lt engine .411 gearing, 110k miles. I have owned this truck for a while and have always had a little shake on the highway and at varying speeds over the years. It bothers me.

I just put new Nankang tires I got cheap from Walmart on and it's shaking more than my old, worn out Yokahama. I also powder coated the rims black, but I'm not sure if that is the problem or not. I have had it balanced twice and the last time it was one of the modern high speed balance machine only some tire places have. The balancer said I needed to change my steering arms and bushings. My mechanic said no. Wondering if I just bought bad tires or the newly powder coated, old custom 20" rims could be the problem??

I like the truck and the 454 engine, but I would like it to drive better on the highway. Up to 50 mph everything is fine, at 65 the cab, passenger seat and even a drink in the cup holder start shaking. The steering is a little lose but not bad for an old truck. No excessive shake in the steering wheel. Any suggestions will be appreciated.
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Thanks for the input. I will look into U joints and hope that's the problem.

I was told if it was the drive shaft, it would shake all the time. My shake varies and is bad at 65mph, but smooth's out above that???
Good news for me. I went to the local dealer Bomnin Chevy here in Miami to try a second round of Road Force Balancing. Even though I had this done recently, I want to try it again as the mechanic I used before left me feeling uneasy. The dealer said 3 of the tires were completely out of balance. The car drives better now then it ever has. I don't normally go to a dealer for service, but this time a $53 bill solved the problem.

I had a feeling the mechanic sales guy I used before was just trying to sell me on replacing tires rods and a whole bunch of other parts to run up the bill. Shame on you. Thanks to Mike at Bomnin Chevy, my car just needed a honest balancing, nothing else was recommended.
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