Lurching 40 to 50 mph slight hill

[Dave LV]

Dealer has put on Toyo AT Load D tires and I would say about 70% of the shuddering is gone. Can someone explain why new tires would do this?

Kinda ties in with the problem first being noticeable at around 7000 miles, and getting worse with more miles.

[wpage]

Sounds like a good question for Goodyear tire!!

[Wisha Haddan H3]

Maybe the wheels weren't balanced right.

[Dave LV]

Goodyears were balanced twice by Discount Tire and three times by Hummer dealer. Made no difference.

Perhaps the thicker tread allowed the tire to absorb more the rotational jerkiness?

Or perhaps the tire is much heavier and the rotational inertia damps out the drivetrain? Hmmm. How to ADD weight to a wheel is something I have never seen written up before.

[wpage]

So Dave The Tires. That was it?

[Dave LV]

Unfortunately, the new tires after a few hours of driving really only reduced shuddering maybe 40%. Helped to have heavier ones, but not the cure. Still has the driveline shuddering enough to be annoying, particularly once you are tuned into it. Plus, LT tires ride harsher than P tires due to the higher air pressure.

[Hmmm2]

Dave, did you ever get your shuddering/lurching problems completely resolved, or, are you just going to live with it?