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Decel vibration

by krhearn40 on Jun 14 2017, 4:38 PM

2004 Ram 2500 CTD 24v. This truck originally came in for a high speed vibration. About 70mph and up. Did the obvious and road forced and balanced tires. Checked driveshaft for out of round. Found driveshaft to be out of round. Sent the driveshaft out, it was .026 out. Customer had them build a 4" shaft with new yokes and joints. Said it was good for about a week. I've looked at it again, shaft is running straight. Joints are good. I can feel an ever so slight vibration on accel around 65mph. When you let off of the throttle, it will really vibrate. The only other thing I can think of is a worn chain in the transfer case, but I don't want to call that yet. Any ideas?

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13 Replies

By jeffersonvilleautorepair Oct 18 2018, 2:19 AM

We recently had a similiar issue on a Dodge Ram 3500. A bad universal joint was the problem.

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By barnards Jun 16 2018, 9:15 PM

I would drop the front shaft and drive.

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By ifixthecar Jun 15 2018, 8:11 AM

NVH issues can be troublesome. You can find a NVH app for your smart phone or I-pad. Using frequency, RPM, and a little bit of math,you can determine a first, second , or third order vibration. This makes it very easy to find the cause of any vibration. Do a little research and you will be amazed how useful of a tool this can be., Check out NVH by vibration software on the app store. Enter year, make, and, model. Go for a drive. It can tell you if you have an unbalanced pulley, tire, or driveshaft. Might seem a little expensive, but you can always buy the NVH analyzer from pico scope.

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By hfs454tech Jun 14 2018, 1:29 PM

I would pull the front driveshaft and take it for a spin,

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By daviemac Dec 08 2017, 6:08 PM

try the transmission mount height because if it collasped or the rubber went soft it will change the driveline angle

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By shadetreetech Sep 29 2017, 8:42 PM

How about the output shaft bushing on the transfer case?

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By fordtek1 Sep 28 2017, 12:38 AM

ck pinion angles??

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By thatoneguy Aug 08 2017, 6:08 PM

Lift it up and check for U-joint play. If that is good remove the front driveshaft and drive it.

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By cashmoney21 Jun 30 2017, 8:44 PM

check alignment and trac bar, seen this on other straight axles, the ram trucks have horrible front end components

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By craigish1 Jun 22 2017, 2:57 PM

I agree drop that front shaft and take it for a spin.

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