WTH! Since day 1! Body shake

[brian4d]

Here we go. I've done a search. If anyone here has experienced this and fixed the problem please let me know.

Slight vibration in steering wheel between 35-40mph, this is not that bothersome I've learned to live with it.

On highway at 75-80mph I'll get a body shake (not the steering wheel). Something feels out of balance.... The shake gets worse when I let off the gas and I decelerate between 75-70.

What I've done.

New steering damper
Rebuilt front drive shaft with new u-joints (greaseable)
Balanced/rotated tires (twice)

I'm at a loss. Only thing I can think of is seeing if the damper is loose after the install 6k ago. Any ideas??

[ArmyRover]

check the radius arm busings and trailing arm bushings. Also check the tranny mount and motor mounts.

[Disco Mike]

Did you replace the centering ball kit?
Mike

[brooksa]

Did you re-balence front drive shaft? I had a vibration like that and it was the drive shaft.

[brian4d]

Originally Posted by Disco Mike

Did you replace the centering ball kit?
Mike

Mike, Brand new precision centering kit and 3 new neapco u-joints were installed. I had them Re-build the ds and assumed that would include a rebalance. I paid $118.00 labor... I ran around and found the centering kit and u-joints myself, the driveline shop had me gather the parts. Also, my roto-flex has no cracks, though I haven't checked to see if any washers or bolts or missing on the coupling. This is my 3rd post, and my 3rd potential fix. I'm at a loss but I know the more $$ and time I spend eventually (we'll) find the problem.


Edit: I'll check my paperwork from Fleetpride to see if they rebalanced the ds. These guys repair rigs and commercial truck drivelines, you'd think they would have rebalanced the damn thing....

[brooksa]

Well I assumed that they balanced mine also, but that was big no. I took mine off and drove it on the highway and my shake was gone, so I knew it was the shaft, I think it was another 25 to have it balanced.

[brian4d]

If they didn't balance it I bet that's my problem. I'm not going to be a happy camper if they didn't. They knew the reason I was having this done was for "vibs".

Edit: And My personal banker told me a $300 investment now is better than a $6,000 loss later... Can I can an AMEN!!

Update: I checked, they rebalanced the front ds when it was in the first time. I ran around town got the c. kit and uj's then took it back. They installed the new Uj's and ck but did not balance it again. Does this make a difference?

[brooksa]

I would take it out and drive it and make sure, vibs gone your good to go, if not at least you know the DS is not the problem. IMO

[DailyDrivenTJ]

Is your vibration harmonic? Meaning like mmmmm-mmmmm-mmmmm-mmmmm?

Does your CV jointed side of the DS snap to the side?

Check your yokes for any abnormal play.

I had taken my driveshafts to truck driveline shops and they flat out told me they cannot balance CV driveshafts because they don't have the correct machine to balance it.

[brian4d]

Originally Posted by brooksa

I would take it out and drive it and make sure, vibs gone your good to go, if not at least you know the DS is not the problem. IMO

Brooksa:

I would but I don't have a CDL. The receipt claims balanced. I've also seend Old Bronco's, Nissan trucks and other 4X4 types there. My guess is that they balanced the drive shaft.

I know my truck sat for 3 months in a guys driveway before he sold it. I'm running Bridgestone's right now 255-55-18. This was prob. iformation you guys could have used in my first post.

Dailydriven:

The driveline guy told me (the first visit) there was play, and he "took it out". This keeps getting better and better...