[8lugcustomz]

Well im not sure if you have the same problem that i had in my fummins truck. but when i would start to accelerate from a stop the whole truck would shake, figured out that the motor mounts were not torqued to specs. and that solved my problem. So i would say check all your mounts and see if they are loose or worn out.

 

[snoel123]

On These trucks both front axleshafts and the front driveshaft turn all the time. Anything rotating can cause a vibration. I have seen many times a front axleshaft u-joint, front driveshaft u-joint and excessive lateral play in the front output t-case bearing cause vibration problems in 2wd.

 

[iretommy81]

i would re check the ujoints. mine was doing that and i checked and had a mechanic check the u-joints, and they seemed fine, no play, but the rear and the drivers front wheel one were shot. could only tell when we pullled them off. saw all the barrings were gone.. or it could be your unit bareing,

 

[nickg]

I posted this over on DTR it was an answer for a U-joint question as well, it might help, just remember a joint can feel tight, but be siezed up, best way to test U-joints is to remove the shaft and rotate joint thru its range by hand

***
inspect the U-joints if you see rust colored dust near the joints they are done like dinner, you might not find them loose (as the needles pile up, tightening the joint) but if you remove the drv shaft and rotate the u-joint thru its range of motion I promise if a joint is bad you will find it by this method, rarely is it the joint closest to the transfercase, almost always its the one closest to the rear diff that goes first (it recieves the most articulation)
*****__________________

 

[skneeland]

every time i have gotten a vibration on deceleration problem it has turned out to be a u-joint. Usually the front joint on the rear driveshaft.

all my trucks are lifted and this is the joint with the worst drive angle...

 

[billw]

I agree, ujoint is the most likely cause. Even just moving the truck ahead a bit and checking the joint at a different angle can help find the bad one.

 

[blk&blu5.9]

my truck also had a wierd vibration and it turned out to be the the u-joint... mine lasted about 70K is this about normal for what others are seing?

 

[josh2477]

How would you check the U joints without taking the driveshaft out?

 

[Big Dog 809]

How would you check the U joints without taking the driveshaft out?

Just give the drive shaft a twist, and watch for movement in the joint. You cant miss it.

Richard

 

[josh2477]

I didn't see anything with my driveshaft... i also jacked the front up and turned my wheels by hands and nothing bound up

 

[nickg]

I didn't see anything with my driveshaft... i also jacked the front up and turned my wheels by hands and nothing bound up

jack the front up again(this takes the load off the driveline) and reach in and physically try to twist/move the joint, you will not "feel it bind" unless you have it in your hand, rotating the wheel wont help you, again if you see any rust "dust" that u-joint is shot and will need to be replaced.

twisting the u-joint while still on the truck works about 8 outta 10 times, If the truck still shakes/vibrates and the joints seem tight remove the drv shaft and rotate thru the range of motion any binding indicates a bad joint

 

[josh2477]

Thanks guys...as soon as I get some time I'll be taking my driveshaft off to try and see if its in the rear. If its not there I'll be taking it somewhere...not too sure about taking my hub and all that junk off.

 

[josh2477]

I'll be taking my driveshaft out this weekend...we'll see then