shake at cruising speeds?

[graysuperduty]

ive read there is alot of rpoblems with shudders from stop i dont have that issue mine is when i get up to about 55-65mph it wont do it if i go slower or faster, and i have also noticed if im doing 55mph and put it in tow haul mode it wont do it

[Lone Ranger]

Hard to guess, no idea on what type vehicle..

Tow Haul mode might up your RPM... If that does happen and affects: Check your carrier bearing if you have a long wheel base, it could be that split driveshaft mid shaft bearing... Or driveshafts out of balance or high centered and knocked out of "true".. I have had a vibration shudder from both.

Also rule out wheel out of balance before you dig any deeper. Those are the cheap fixes. After that, "need more input ET says"///

[Jarrod B]

i noticed that i have a slight one when im going 40-50 and stops when od is let go.

[graysuperduty]

just bought toyo mt about a month ago so i dont think balance is the issue, im going to check my carrier bearing.

[Codymunlin]

I have an 08 F-450 stock drivetrain with 80,000 miles and at about 65 to 70 it starts a slight shimmy, the faster I go the worse it gets. Damn near rattle the teeth out of your head. Been to dealer, rotated tires, they inspected everything and said it is a 450 and normal. I am the original owner and this is not normal. 2 different dealers have said the same thing, "everything checks out, nothing worn, just normal for a 450". This truck did not do this until about 65,000 and continually gets worse.

[graysuperduty]

well i have figured mine out that it only dose this when i have my extreme race tune or extreme street tune, i belive its somehting wiht the touqure converter locking up, put a small tune on it runs fine

[Lone Ranger]

Codymunlin,
This may be toooo simple, but have you checked the wheel alignment? If the shimmy comes from the front end, I would check the "toe in".. If it does not have enough toe in, that is angle in on each tyre in the front, then it "hunts" side to side.. This slight "toe in" is only a matter of a few milimeters but could be the fix...

Amatuer Techie in Oz, lone Ranger

[Codymunlin]

Lone Ranger,
I had the truck realligned already with new tires abou 5000 miles ago and it was there before and after, The alignment was fixed though

[rvhauler123]

I'm having the same issue with my '06 f250 (263k miles). Just had ICP and reflash due to cold start problems. Taking back to dealer to have shaking checked out (feels like a bad u-joint).

[Big Heat's owner]

i have an 03 f250, 2 pc drive shaft. the ring balance, counter weight, whatever its called, near the diff on the drive shaft, was sliding. imbalanced driveshaft will give you that "buttshaking" frequency when cruising higher than 35mph. also check drive shaft u joints. if driveshaft is not balanced, can wear out u joint bearings, if not already worn.