Unknown Vibration

A steer axle that is towed out will lead to a vibration that comes then disappears as you increase your speed. I've heard starts at 45-55 mph then goes away 5-10 mph faster. It will be worse the more the kingpins are worn. I went thru this 10 years ago. Another factor with my truck was a slightly twisted frame. You know a frame us twisted when the cab looks like it is leaning one direction. You can put a level across the frame rails and the put it along the bottom of the cab to be more sure. Worn kingpins and a twisted frame apparently was sone of the cause for my truck. I personally do my own alignments and know the tow in was correct. It wasn't until I replaced the kingpins that the vibration went away. BTW, a steer axle needs to be towed in 1/16" when sitting on the ground after pulling forward. On an alignment rack, a little more because the wheels "relax" on the plate the tires rest on as they can turn.

 

If you have air suspension, check the height. Adjust accordingly to specs.

 

Check the slip through driveshaft also, try pushing it up and pulling it down for excessive play. The teflon on the splines will wear if it’s not lube.(Sometimes they get missed).

 

bad balance. Do not get cheap tires ever again

 

Been there done that, and they weren’t cheap tires either.

 

Can you advise any shop who can do those things? Just bought truck had have this kinda problems , living in south Florida and these guys know not more than me about 3 axle

think I got trust angle problem

 

Never should have accepted the repair, ALWAYS install a new race with a new bearing!