vibration floor and seat - Dodge Cummins Diesel Forum
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post #1 of 4 (permalink) Old 07-21-2019, 02:49 PM Thread Starter
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vibration floor and seat

I am trying to narrow down a vibration felt in the floor and seat, 45 mph and up to 85+ in my 2016 ram 2500 4x4 6.7 crew cab, 3.42 ratio..81 K miles I've had issue before new tire tires and after. currently running factory 20 x 8 wheels with LT285/60r20 continental tires. Had road force balance at 2 different shops, replaced 1 RR wheel ($500 from dodge dealer)from road force balance results.Problem still persists.
I checked LR wheel and I have 42 thousandths side runout on wheel, I can see wheel/ tire out or round with rear jacked up running 45 mph. I also have 18 thousandths runout on axle hub, and 12 thousandths on face of axle flange. I don't know what tolerance factors are before runout is felt.

Question, is hub runout causing wheel runout? or do I have another bad made in china factory wheel.

I pulled rotor and found oil/grease leaking onto emergency brake shoes, which must be a bad seal, but didn't feel and up down movement on hub assembly bearing.

I have videos of all checks, not sure how/where to upload to.

thanks,

Rick

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post #2 of 4 (permalink) Old 07-21-2019, 05:25 PM
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Fix the hub leak first. Second, go check to make sure the front shaft has not lost a ujoint.
Next, check the driveshaft for bad ujoints. In that order.
Then make sure the driveshaft has no up/down play in the front yoke or at the rear axle.
The tires being slightly out of round would be fixed by balance unless they put huge weights on, then you may have a bad tire that does this only when warm or where the belts moved in the tread.
You can also try lowering the air pressure as a fully aired up tire on an inloaded truck turns into a bumpy ride.

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2013 RAM 2500 diesel 6.7 Bighorn Crew Shortbed 4x4 in white. As of 7/21/16 16,100 miles.
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post #3 of 4 (permalink) Old 07-21-2019, 06:45 PM Thread Starter
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thanks for the reply, I checked front and rear drive shaft u-joints, all tight, no signs of movement or grease seepage. A little bit of movement on rear tail shaft at transfer case, but no signs of seal going bad from worn bearing or sleeve. also a little bit of movement on slip yoke with front drive shaft, but seemed normal.(not sure what max movement is)

With the truck on jack stands and running 25 - 45 mph, I see a lot of out or roundness (lopsided) at the em brake section of the rotor. Its almost time for new pads, i'll replace and see if anything changes.
I swapped rear tires left to right, seems original LR is problem on RR side and new purchased wheel shows out of round lateral wise on LR.
I'll try tire pressure trick as well.


Rick
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post #4 of 4 (permalink) Old 07-27-2019, 09:32 AM Thread Starter
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Update, I pulled LR axle shaft and measured .002" lateral runout with dial indicator on hub flange where wheel mounts to. With axle shaft in place I have .012" runout.

Rick
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