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I have a 2003 dodge ram 2500, 5.7 liter engine. I recently had it at the dealer to have the front and rear pinion seals changed, along with the rear transmission seal. Ever since I brought it home it has this weird vibration, I took it back to the dealer 3 times, they kept saying there is nothing wrong, but its still there. It only happens at low rpm, when I lightly touch the gas, as if I am trying to stay at a constant speed. It gets worse the faster I go. I can feel it under the truck, I looked it all over, nothing looks wrong. Ujoints seem fine. It also makes a different noise if I go down a hill and I am not touching the gas. Any ideas?????

 

Rear drive shaft could be out of balance..

 

Why did you change your seals? Leaks sometimes means bearing issues. Possibly the dealer damaged the pinion bearings or U-joints while they where doing the work. If it is a bearing they usually get louder with time and can find its location before it fails.
Hope you find it

 

if it began happening after the visit to the dealership,
driveshaft or u-joint problems would be the first guess

if you end up trying to diagnose this yourself
I was recently pointed to this old 1974 Chrysler TSB
for finding and fixing vibrations
and for us DIY types this TSB is superior to modern versions:

http://www.hamtramck-historical.com/...SB-Index.shtml

scroll down to Miscellaneous
and then look at the 25-02-74D TSB
scans that begin here:

http://www.hamtramck-historical.com/...4D%20page1.jpg

notice the tricks using hose clamps on the driveshaft

for more vibration hunting tips go to these:

http://www.babcox.com/editorial/us/us20040.htm

part II of above article
http://www.babcox.com/editorial/us/us50014.htm

Good luck with your hunting.

 

Looks like plenty of people are having vibration problems with the 07 Dodge Ram. This large attorney firm that works a lot of car cases is investigating.....


http://www.stuevesiegel.com/CM/Curre...ion-Defect.asp