Whats causing my vibration ??? Front of truck

any updates?

 

Yea Alignment could be off? Usually if its a UJoint, you will hear a metallic crunch when you go from one gear to the other(Automatic) or when you let off on the clutch in a straight but not always. Id check the driveshaft to see if it wiggles up and down, side to side at any of the U Joints.

 

This is what I did in an attempt to fix the vibration I had on the left front above 45 mph. Balance, new shocks, check bearings and king pin bushings, check wheel runout as mounted on the hub, check tire mounting for centering on the rim (based on the mold line in the tire), checked spring shackle bushings, check lash in the steering box, put on steering stabilizer.

Here is what the problem was - the tire had 0.070" of runout on the tread. Sooooooo..... I built a tire truing apparatus out of a router (with a 3/8" bit installed) mounted to a Chinese X-Y table. Jacked up the left front, positioned the truing rig, turned the tire slowly by hand, took off a little at a time running the router across the tread until there was no gap in the cut. It took a while, but not as long as taking it to some outfit that would tell me nothing was wrong with the tire.

Cost of the truing apparatus.... a router (already had one) and the X-Y table from Grizzly ~ $120.
I set the router bit depth to maybe 0.030" so that if things went wrong, it wouldn't damage the tire, but, no problems.

I thought I would have to re-balance ......nope, as smooth as can be now.

best of luck on yours

 

Any updates I still have this problem And would like to know if you rectified your problem ??

 

Shocks for sure, and then check if the tire was mounted evenly all the way around on the rim. It may be running egg shape. Also, if you do not have center mounting hubs, it may be not mounted on the studs symetrically and running egg shape as well. Probably not shocks though, as they mostly affect the harsh ride, and you only have the condition on one side.

Best way to tell, is jack it up, turn the tire and wheel out, put a dial indicator at axle level and rotate the tire. If it is egg shaped, it will show up immediately.

I have had more than one truck with both conditions on new tires, and once fixed, the truck was like night and day different.

Check it soon, because a tire running out of round will start cupping....

 

Just got mine fixed checked a dozen things and new tire fixed it.

 

Check your steer axle hubs...

 

Sorry to bring up this again, but I am new to the forum. I have a 98 9400i with a 12.7 detroit and spicer 10 sp. I bought the truck for 8k in feb 2015. Since then everything but the rear axles has been replaced. Inframe, repalced eaton-fuller tranny, all new front end (pins, springs, bearings) running 24.5s all the way around, aluminim wheels in front. This is the long wheel base truck with the big sleeper you can walk around in.

It hasnt been used much this year, but I cleaned it up and took it out for 50 miles last Sunday. 2 new Toyos on front and new shocks all the way around, btw. At 55 it develops a significant wobble, almost like there is a knot on the rear tires. There is no vibration in steering or front end, but my shifter is oscillating left to right about 6 inches. It gets worse the faster you go. I havent gone over 75, but is shaking you pretty badly then.

Long drive shaft, u joints and carrier bearing have 10k miles on them. We replaced 2 rear air bags in 2015. Rear wheels look like they roll correclty when rolling down the road.

Any suggestions? I have read all of the previous 7 pages of this post.

 

Sometimes brake rotors can be the cause of shaking. If your steering wheel shakes while you are braking then the problem could be caused by "out of round" brake rotors. This vibration can also be felt through your brake pedal. Another common problem that can cause shaking is when a brake caliper sticks