Vibration at 70 mph

[donjhart]

My 14 3500 4x4. Dually has a vibration at 70 mph. After reading all solutions driveshaft tires out of balance etc that has not cured the problem i got out my tape measure due to my inside right side tire is wearing on inside corner. I measured from center of inside tire to center of front tire and it measures 12 ft 6.5 inches. O then measured left side and it measures 12 ft 7.25 inches. A difference of .75 inches. I am going to jack truck up and loosen ubolts on one side and see if i can pull axle in line and retighten ubolts and them measure distance again. They should be same distance on both sides front to back.

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[HKBIGDADDYDIESELDAN]

Welcome to the family

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[Polaraco]

My 14 3500 4x4. Dually has a vibration at 70 mph. After reading all solutions driveshaft tires out of balance etc that has not cured the problem i got out my tape measure due to my inside right side tire is wearing on inside corner. I measured from center of inside tire to center of front tire and it measures 12 ft 6.5 inches. O then measured left side and it measures 12 ft 7.25 inches. A difference of .75 inches. I am going to jack truck up and loosen ubolts on one side and see if i can pull axle in line and retighten ubolts and them measure distance again. They should be same distance on both sides front to back.

You have a split drive shaft? How many miles on the truck? Tires? Rotors? Calipers

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[donjhart]

So i had the chance to get my truck in garage and measured axle distance again from front to back and this time it was a 1/2 inch difference . When i went to loosen the ubolts on left side they were not at all tight. I could see evidence after raising truck that u bolts had been rotating front to back on axle. I attached ratchet strap to left side and pulled forward and then retightened u bolts. The deisign of u bolt locking plate is poor in that there is about 1/4 inch of play in either direction that will allow axle to shift back and forth . Also the size of the u bolts are what a 1/2 ton would use so be carefull when retorquing u bolts. I will be taking it for a drive today to see if vibration is gone

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[DIESELWRKS]

So if this is not the cure for your vibes, would need some more info. did you have tires balanced, road forced? as polarco said, you have a 2 piece rear shaft. Did you drop the shaft and
inspect all the joints? one other question and to me really important, where are you feeling the vibration when you are driving? butt, hands, feet? does it do it in both 5th and 6th gear.

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[Polaraco]

So i had the chance to get my truck in garage and measured axle distance again from front to back and this time it was a 1/2 inch difference . When i went to loosen the ubolts on left side they were not at all tight. I could see evidence after raising truck that u bolts had been rotating front to back on axle. I attached ratchet strap to left side and pulled forward and then retightened u bolts. The deisign of u bolt locking plate is poor in that there is about 1/4 inch of play in either direction that will allow axle to shift back and forth . Also the size of the u bolts are what a 1/2 ton would use so be carefull when retorquing u bolts. I will be taking it for a drive today to see if vibration is gone

So if this is not the cure for your vibes, would need some more info. did you have tires balanced, road forced? as polarco said, you have a 2 piece rear shaft. Did you drop the shaft and
inspect all the joints? one other question and to me really important, where are you feeling the vibration when you are driving? butt, hands, feet? does it do it in both 5th and 6th gear.

Yeah what he said

check the carrier bearing too

You know, not for nothing, and don't take me wrong, the rear axles are self centering. It appears the truck hasn't been lifted so I suspect it was your measuring. I had a broken forward eye on my spring and it didn't vibrate. Off center would cause the truck to track and not vibrate.

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