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Suburban shakes on Highway

6742 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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Looks like the same issue I had with my 2001 5.3L suburban.
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Mine had no steering wheel shake but the whole body shook like crazy. I can see the seat head rests shaking sideways.
Usually this is a driveline issue.
Mine turned out to be a loose transmission mount bolts hidden underneath the cross member.
It caused the tail end of the transmission to shake.
I found the problem after spending on u-joints and installing new tires.

Yours could be a little more complicated to diagnose since it has two drive shafts.
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To me what mattered most was marking the relative positions when disassembling the front yoke from the main aluminum drive shaft when replacing u-joints.
This is because the whole drive shaft assembly was balanced as one piece.
The yoke position relative to the transmission output did not matter to me as well as the differential end.
My 2001 Suburban is still so smooth.
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