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Old 02-04-2011, 12:05 AM
erm
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I had that problem with my MegaCab. I had a slight shudder from about 45mph to 54 mph, then it was smooth until around 63 mph and stuck with me all they way past 75 mph. We went through the driveline, replaced the intermediate driveshaft carrier bearing and the rear u-joint. No joy. The vibration was still there.

We swapped out the tires and wheels and the vibration went away. Since mine had been statically balanced, we did a road force balance and found one seriously out of spec tire. It was replaced and the problem went away.

I'd try a road force balance.
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