Vibration at 60-70 mph

07RAM3500 · 10-02-2008, 09:08 AM

I have a 07 3500 4 X 4 standard cab dually lifted 6" 37" tires. Recently developed a vibration at 60-70 mph. checked u joints on the rear and found one bad. Pulled the drive shaft had both u joints replaced. After reinstalling the shaft and driving I still have a slight vibration that I feel in the floor board, and in the seat. I dont feel it in the steering or the the gear shift. Could it be the tires out of balance? or driveshaft out of balance? Please help.

nbaca · 10-02-2008, 10:51 AM

is the driveline angle bad?

__________________
2001.5, 6 speed, leveled, 285s, 4in turbo back to dual 6in mitre, adr w/pulse, s&b intake, boost elbow, raptor 150, 1/2in big line kit, draw straw, custom fuel filter off of detroit series 60, stage 4 jammers, soon clutch and turbo

Quadman · 10-02-2008, 10:54 AM

With a 6 inch lift front U joints could be bad.

07RAM3500 · 10-03-2008, 11:26 AM

checked the front u joints and they are tight, no signs of wear on them. As for the angle of the rear driveshaft at the pinion, maybe 3 degrees down.

totalloser · 10-04-2008, 06:44 PM

Probably an irregularity in the carcass of a tire or an out of balance wheel. Rotate your tires. Irregularities are somewhat common, and unavoidable. The reason you are hitting it at 60 t0 70 is the tire size. This problem usually occurs at lower speeds due to tire rotation speed. IE Bigger tire turns slower, so problem occurs at higher speed.

__________________
01 24v 100hp tips, 4"ss BDbrake &steering brace PSCpump 1.5"dom steering tapped box 1.5"ram manual CAD switch dual carters 3.55's LSD, big shaft nv5600/241HD 6 35's inners pulled in (no spacer) Ugly black and thrashed!

Ramtech · 10-05-2008, 07:16 PM

the last 6" lift I did had the same problem - i called tech support and found that i had to change the caster of the front differential - fixed the problem - just a thought

10-02-2008, 09:08 AM	#1 (permalink)
07RAM3500 Newbie Join Date: Feb 2007 Location: S.E. Texas Posts: 3 07RAM3500's Truck Pics	Vibration at 60-70 mph I have a 07 3500 4 X 4 standard cab dually lifted 6" 37" tires. Recently developed a vibration at 60-70 mph. checked u joints on the rear and found one bad. Pulled the drive shaft had both u joints replaced. After reinstalling the shaft and driving I still have a slight vibration that I feel in the floor board, and in the seat. I dont feel it in the steering or the the gear shift. Could it be the tires out of balance? or driveshaft out of balance? Please help.

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10-02-2008, 10:51 AM	#2 (permalink)
nbaca Cummins Enthusiast Join Date: Jun 2008 Location: Albuquerque, NM Posts: 203 nbaca's Truck Pics	is the driveline angle bad? __________________ 2001.5, 6 speed, leveled, 285s, 4in turbo back to dual 6in mitre, adr w/pulse, s&b intake, boost elbow, raptor 150, 1/2in big line kit, draw straw, custom fuel filter off of detroit series 60, stage 4 jammers, soon clutch and turbo

10-02-2008, 10:54 AM	#3 (permalink)
Quadman Cummins Fanatic Join Date: Jan 2008 Posts: 163 Quadman's Truck Pics	With a 6 inch lift front U joints could be bad.

10-03-2008, 11:26 AM	#4 (permalink)
07RAM3500 Newbie Join Date: Feb 2007 Location: S.E. Texas Posts: 3 07RAM3500's Truck Pics	checked the front u joints and they are tight, no signs of wear on them. As for the angle of the rear driveshaft at the pinion, maybe 3 degrees down.

10-04-2008, 06:44 PM	#5 (permalink)
totalloser Diesel Freak Join Date: Oct 2007 Posts: 720 totalloser's Truck Pics	Probably an irregularity in the carcass of a tire or an out of balance wheel. Rotate your tires. Irregularities are somewhat common, and unavoidable. The reason you are hitting it at 60 t0 70 is the tire size. This problem usually occurs at lower speeds due to tire rotation speed. IE Bigger tire turns slower, so problem occurs at higher speed. __________________ 01 24v 100hp tips, 4"ss BDbrake &steering brace PSCpump 1.5"dom steering tapped box 1.5"ram manual CAD switch dual carters 3.55's LSD, big shaft nv5600/241HD 6 35's inners pulled in (no spacer) Ugly black and thrashed!

10-05-2008, 07:16 PM	#6 (permalink)
Ramtech Tech Specialist Join Date: May 2008 Location: Del Rio, TX Posts: 346 Ramtech's Truck Pics	the last 6" lift I did had the same problem - i called tech support and found that i had to change the caster of the front differential - fixed the problem - just a thought