team222

Hello Dustin......thank you so much for your time and answer. My replies are as follows You said >>>> To start with your explanation and testing. You say in top gear below 1900rpms you have vibrations, but in any other gear at the same speed you have no vibrations? Or are you saying in second gear at the same rpm you have no vibrations? The same rpm in 2 different gears will not be the same rpm of the driveshaft. If it is still a post transfer case vibration its all about speed not rpm. Confirm for me that you tested different gears at the same mph not rpm. You would really need to get to the speed of the vibration and then down shift and maintain that speed and confirm if the vibration is present. It may be tricky to detect given the increased engine noise and vibrations, but this would eliminate all of the u-joints and shafts front or rear if it goes away. My reply >>>> Yes there are vibrations in high gear upon acceleration that stop at 1900rpm. I did try second gear all the way up from 1200rpm to say 2500 rpm and = no vibrations. This was all rpm based, not speed. I will try this as speed based tomorrow and post a reply. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> You said >>>> I have often wondered when the balance a drive shaft if they do it under the matching torque of the engine and drivetrain load. My reply >>>> Here in SE PA it seems there are only a few places that can balance driveshafts. I had the entire drive shaft assy front to back taken off because the company that does the balancing does not do this......the company that did this delivered it to the company for balancing and check out. I wanted was all new ujoints and carrier bearing replaced and everything balanced....this way it would eliminate 3 things right off, but this got lost in the translation What I got was the balance only. What I can do tomorrow or Monday is go over to the shop that did the balancing and find out what they actually did and get back to you. Plus, they can check to see if all the weights are still in place. All this brings up another matter in that I am not asking you to do this free.....infact I would like to reimburse you for helping. This way you could talk directly to this shop if need after I report back tomorrow and save time for both of us. Will get back on this to you after I talk to them >>>> Another phase 2 option is to go to a shop that has a stock truck like mine and have them swap out on a temporary test basis the entire drive line that from a truck that does not have the vibration mine does. I have a place that will do this. If this works ....maybe go right to a 1 piece driveshaft might be the right approach to get it done and solid once and for all? If they would have a truck that has a one piece driveshaft for a swap over swap that over instead ...skip the above..... and go right to installing a new one piece drive shaft.if this eliminates the vibration. Later now and thx for the steps in this path to get it fixed and done once and for all Mike

2007 Dodge 3500 5.9 automatic, 4wd, 4.10. 90,000 miles, 1 prior owner Modifications: None, truck is stock Issue Any RPMs in top gear below 1900…. acceleration creates a vibration. At 1900 it goes away. This vibration can be felt in the drivers side floor and steering column. My wife says she can feel it also on the passenger side. There is no to little noise with this vibrations, but a very faint “growling” can be heard sometimes listening very closely Truck Usage We want to go out west fulltiming in our 5th wheel, unfortunately the departure has been delayed due to this issue and no one local including the Dodge dealer can diagnose or fix. We would be more happy to pay for help on this….and please accept this offer. Circumstances 1. I bought the truck early in 2014….no vibration 2. Turned out it needed a head gasket and also one cab bolt was broke and these were repaired. After these repairs the vibration started. 99% sure it was not there before. Action to Date 1. Driveshafts balanced. This reduced the vibration and sometimes there was no vibration, Now after 500 miles or so the vibration is back and same as it was prior 2. Carrier bearing not replaced during driveshaft balance, but acceptable per examination by the shop that specialized in driveshaft balancing. 3. U-joints expected and acceptable My Tests 1. Accelerated up to 80mph …..put into neutral ….no vibration on coast down at any speed 2. In second gear …accelerated from 1000rpm to 2500rpm …no vibration Thank you Mike South East PA