2000 T2000 rear cabin shakes.

vibration that comes consistantly at different speeds will usually be out of ballence tire somewhere. It could be a bad belt or something in a tire but that will usually be much more violent. The steering wheel will only shake if it's a front wheel.

 

Just a thought but what about a U joint, check and see if they look ok, had one years ago that did much the same as your describing.

 

there should be a stabilizer bar under the berth....check its bushings...when they got out they sway bad

 

Um... am I the only one who noticed you were driving "at or near 85mph" on recaps? Are you smokin crack?

As for the shaking, I'd suspect something in the rear. Jack the axles up off the ground and let her idle in low gear while you check for bent wheels, bad tires etc. Check the cab to make sure the pivots aren't worn out and the panhard bar, if it has one, is tight and attached.

If you don't see anything there, have someone watch from behind while it rolls down the road. Have them look for bouncing or wobbling tires.

With 3/4 million miles on her, she ain't gonna drive like a Cadillac, but it shouldn't shake like a Chevette either.

 

Common Issue.Observe the height of the air ride.Does the frame height exceed height of tires,then coraspond accordinally when under load.Contol arm{airide} broke?Have the Thang checked out at a trustworthey spring/alignment shop.When you buy used you get sombodys problems.May not be an issue with a trailer-on.You bought a worn-out rear suspension.They require constant repair.Suggest replace recap drives unless a{under 60mph} lightweight.Also have reserveve for other{engine is the biggie}repairs.Shootin from the hip,$1500,rebush

 

U joints will vibrate on deceleration if you loat or accellerate they stop then when you let off the pedal they viibe.

 

Good point.The airide height will also contribute to the driveline alignment.Example ,Airide control arm becomes disconnected(worn and breaks due to jolt) the arm goes to the extreme inflate or deflate postion.This inturn thows the driveline of of alignment and whe deacell I my sound as if your tranny,ect is self destructing.Control(adjustment) arm or arms will also fail during a tow,possibly to the sales lot ect.Happy Trails!

 

I dont know about the kenworth...but my freightshaker had an airline breakline that went to cab air bag...until I could get it fixed the sleeper area vibrated, bounced and was just plain annoying going down the road