Intermittent Pulsating Drivetrain? Viberation

[landtoy80]

I had the intermittent pulsating viberation when I got the 80. After some time it want away. It has been gone for a couple years.
I had the vib before and after all my t-case replacments.
Well, after the rock bashing trail last week, the vib is back and is stronger.
It shakes the floor boards at about 75 mph.

Has anyone solved the viberation or found out what it is?

 

[Tool Pusher]

I had the intermittent pulsating viberation when I got the 80. After some time it want away. It has been gone for a couple years.
I had the vib before and after all my t-case replacments.
Well, after the rock bashing trail last week, the vib is back and is stronger.
It shakes the floor boards at about 75 mph.

Has anyone solved the viberation or found out what it is?

Landtoy,
Pulsating vibration sounds like a u-joint out of phase on the driveshaft. Or, you might need a CV joint if you are running a lift and your u-joint angles do not match.

Your recent vibration sounds as if you hit your drive shaft on something and bent it or knocked a balancing weight off.

David Sword

 

[-Spike-]

Your recent vibration sounds as if you hit your drive shaft on something and bent it or knocked a balancing weight off.

David Sword

x2, I'd look there first. Check your u-joints and also tires for balance (missing weights or chunks of rubber) too.

-Spike

 

[MJADDICTION]

Check above and hubs too.

 

[landtoy80]

Grease the driveline and replace the tyres, the vib is gone.

 

[-Spike-]

-Spike

 

[GXO]

I have had this before and it was caused by the flexing of the truck pushing the grease around the splines on the DS front and rear...it would be in a nice calm state, wheel it, and then vibrate home...no dings, dents or otherwise.

Threw some grease in the splines (2 pumps) and all was well again.