Need help!!

[kyleh20]

Hello,
I need help figuring out what is wrong with my truck everything is running fine but when i drive it vibrates pretty bad the worst is at 75 mph
what i did

-i checked the torque converter bolts
-i checked for play if u joints
-i checked for play in the front end and there was none
-my tranny temp is around 180 but no higher
-my tranny fluid does seem burt and has a funny smell though
-i got my front end aligned and tires balanced

i don't know what else to look at to try to figure this out i any thinking my torque converter is bad or maybe my tranny i was thinking about just upgrading to a BTS but unsure about doing that its a lot of money if that not going to fix the problem

any help would be great thanks!

[SuperCrutyPS]

A question for clarification.

You say "Vibrates" - Is it more high pitched like a buzzing/hmmm type or a shaking like someone has a hold of the bed rails and pushing/pulling back and forth?

[7.3HeavyHauler]

mine does that and i had some crap tires on it there cupped i'm sure, luckily i have new ones now, no vibs also ball joints can aid in the vibs as well. i'd start there i'm sure theres other reasons but i'm just throwin that out there.

[kyleh20]

i know its not ball joints there is no play in them and it vibrates like a back massager it is not a minor thing by any means it is very stung and it is not really in the steering wheel i can feel it more in my seat and floor than anything else and it kinda goes away under hard acceleration only when cruising i really notice it

[SuperCrutyPS]

Have you checked your drive shaft U-joints????

[NoRalPh]

Do you have a Center Bearing in the driveshaft?

[Turbostang500]

X2 on the last 2 posts.
Sounds like a driveshaft problem.

[kyleh20]

there is no play in the driveshaft i shack it back and forth and it doesn't move cause anytime i blew a u joint the driveshaft would move inside of them cause the needle bears went is that right?

i do not have a carrier bearing on my driveshaft

[Turbostang500]

A locked up u-joint can cause the same problem.

You would have to remove the driveshaft and check that way.

[kyleh20]

oo really i would probably just change them then but what else could it be?