What can be causing a high-speed shudder ??

[Chuck 1935]

Originally Posted by Peacekeeper6

Thanks for the replies everyone !!

To answer the questions, the shuddering INCREASES as speed increases.

I don't usually drive so fast. My cruise is usually set at 50 or 55, even 60 if the road is loooong, flat and boooring.

I just wanted to find out the top speed of my rig at the time I noticed it.

I'll probably just live with it up until I buy new tires. It's really a non-issue at "turtle" speeds I usually drive in.

If you look for a good tire shop or truck tire shop, they can balance and true your tires. They can also tell you if you have a bent wheel or not. The problem is, that letting it go could cause more problems later on. Good luck.

[Grumpyyyy]

If tire balance doesn't solve the problem I would go straight to the carrier bearing on the drive shaft JMO

[TAZ]

Harmonics on a 20" tire start around 70mph so balance or out of round are suspect as others have pointed out.

70 is max for me and I prefer 65 top end. (Not telling you eat to do) but even if lower speeds are not a problem the tire wear and impact on the drive train from balance are worth fixing.

JMHO.

[LVJ58]

Have you had your front suspension and steering linkage checked for possible excessive wear?

[gauto5150]

I'm thinking driveshaft balance.
And Sammy Hagar can't drive 55.