2018 3500 vibration after 3 inch bds lift - Dodge Cummins Diesel Forum
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post #1 of 9 (permalink) Old 11-20-2019, 09:30 PM Thread Starter
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2018 3500 vibration after 3 inch bds lift

Hope someone can help. I just spent 2500 on a 3 inch bds lift for my ram 3500 Cummins. Lift looks great but caused a rear end vibration. In the rear I changed the shocks to fox 2.0s and added a 2 inch angled lift block that bds supplied. I have tried the factory tires and wheels that were smooth before the lift and the vibration is still there. I have read alot about drive line angles and how tapered blocks are bad but those are mostly with Chevy's. So I measured the drive line angles and cam up with 85 degrees downward angle on the transfer case and 82 degrees up on the pinion. My question is could that 3 degrees be the cause of my vibration and various speeds and upon takeoff. The truck has a one piece drive shaft with a single u joint on either end. Hope someone can help

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post #2 of 9 (permalink) Old 11-20-2019, 09:39 PM
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Could be front end alignment masking itself
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post #3 of 9 (permalink) Old 11-20-2019, 09:44 PM Thread Starter
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No front end was ligned up after lift no vibration in steering wheel definitely coming from rear
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post #4 of 9 (permalink) Old 11-21-2019, 01:39 AM
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Where are your Cam Bolts set? May feel like the rear but I have seen alignment setting cause a vibration!!

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post #5 of 9 (permalink) Old 11-21-2019, 01:43 AM Thread Starter
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The shop that did the alignment adjusted the cam bolts so that they were in spec.
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post #6 of 9 (permalink) Old 11-21-2019, 01:57 AM
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can we get some pics of the cam bolts? also, you can purchase a carrier bearing drop if you have one to reduce driveline angles a little. i just used plate steel cut into strips with bolt holes, went 1/4" at a time till vibe were gone.

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--2006 2500 4x4 4 door long bed auto, 8" BDS, 37s
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post #7 of 9 (permalink) Old 11-21-2019, 01:57 AM
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Quote:
Originally Posted by 2018 Cummins View Post
The shop that did the alignment adjusted the cam bolts so that they were in spec.
OK well they should be one to two notches towards the rear of the Truck. Both should be about the same position, spec on lifted truck doesn't mean anything as I have seen some crazy setting that shop did!!!

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post #8 of 9 (permalink) Old 11-21-2019, 06:14 AM
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I have a 2018 2500 with a 4" BDS I just went through this. Chasing a vibration for over a year. The shops alignment machine puts the toe and caster to factory specs. These alignment guys are lost when it comes to these trucks I find. Took me 3 alignments to get it right. Go with thuren specs 0.00 toe and I went with 3.7 castor the alignment shop told me their whole computer screen will be red and the truck will ride like crap if they do these specs.

I said just do it and stood over them while they adjusted things. All said and done vibrations are completely gone and truck drives perfectly ...
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post #9 of 9 (permalink) Old 11-21-2019, 08:34 AM
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Quote:
Originally Posted by 2018 Cummins View Post
The shop that did the alignment adjusted the cam bolts so that they were in spec.
Whose spec? His, Chrysler, or Thurenís?

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