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My truck has what feels like a driveline vibration at 71 mph when accelerating slightly or climbing a small hill, ie. light power load. The speed is very specific and seems to have increased a bit with time. This started when my son had the transmission rebuilt. The transmission shop replaced the U joints and balanced the drive shaft at the same time. My son noticed the vibration but since it was relatively small and only happened at the specific speed he ignored it. Now that I have it and my wife is the dominate driver, that's another story, she told me to get it fixed before it got worse and something broke. I knew it could be difficult to isolate but figured it was just a shaft balance that hadn't been done correctly. Shop first reported the U joints were showing wear and since they needed replacing would try that first. Then they asked to have the shaft balanced which I OK"d.
No change in vibration. Sent the shaft back for another try, no change. Then they swapped the shaft for a different one from the balance shop and again no change. They have now opened the differential to check it to see if the vibration might be there and also checked the transfer case and have found nothing. They even swapped wheels and tires from another truck to see if it is a tire issue, it isn't. Shop foreman still thinks it is shaft related but I think there is something else we are missing that may be obvious when we find it but right now it is a mystery. All help will be appreciated.
 

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Is this truck 4x4. If it is it could be someone has installed a 1” shorter driveshaft for the 4x4. I had this problem.
 

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Rather than the rear driveshaft, could it be the front driveshaft causing issue? If the rear joints were worn, fonts couldn’t be far behind? Thinking out loud here


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Wierd, my truck has a vibration 65-70mph. New wheels and tires, new drive line, free spin hubs in the front. Nothing seems to make any difference, guess it's just the nature of the truck.
 

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Do the shaft/U-joint angles meet factory spec? I assume it's a 2 piece shaft.Did the carrier bearing and it's mount, including the bracket and hardware check out, everything tight,no damages,cracks,etc.

From the MY 06 FSM - Here's a few other things to check: It seems some of the below you already had checked but it might be useful tog o back and double check.

CONDITION POSSIBLE CAUSE CORRECTION
Propeller Shaft Noise
1) Undercoating or other foreign material on shaft.
2) Loose companion flange bolts.
3) Loose or bent U-joint yoke or excessive runout.
4) Incorrect driveline angularity.
5) Rear spring center bolt not in seat.
6) Worn U-joint bearings.
7) Propeller shaft damaged or out of balance.
8) Broken rear spring.
9) Excessive runout or unbalanced condition.
10) Excessive drive pinion gear shaft runout.
11) Excessive axle yoke deflection.
12) Excessive transfer case runout.
 

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Wierd, my truck has a vibration 65-70mph. New wheels and tires, new drive line, free spin hubs in the front. Nothing seems to make any difference, guess it's just the nature of the truck.
I've had one from 70-75 that I've never been able to figure out either despite replacing almost everything.

I have found the alignment affects it a little, but literally nothing is old or worn in the front, all replaced with high quality aftermarket. Still does it.
 

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Small vibrations mean you have to zero literally everything out to establish some kind of baseline. I threw parts at my 06 for months trying to fix a shimmy at 75 that manifested as a slight steering wheel shake. Eventually I just stopped driving 75 (70 or 80)... Then it got irritating and I replaced part after part. Bought a new set of wheels and tires and it went away. My tire guy commented that there was some rust on the mating surface on the right front wheel. Ground it off with a wire wheel before installing the new wheels and tires. No vibration. So in conclusion, it could have been the rust on the hub, a small out of round in a wheel, a slight mis-balance on a tire.... no idea. In this case it was just magically gone and hasn't been back. A surgeon wants to cut, a mechanical wants to replace a part. Tire guys say it's a tire issue and transmission guys swear it's something they can fix. Start looking at the small things. Clean the hub faces, proper lug nut torque, grease the bearings, check the alignment. These all cost little to nothing and might just magically make it go away.
 

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Exact same thing was happening to me on my truck. Here is the thread i started on it. At the end of the thread I posted what fixed it for me. Hope you find it...
 

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Discussion Starter #10
need truck info???
Sorry about that. The truck is a 2004 1/2 2500 quad cab long bed 4x4 with automatic transmission. Totally stock. Guess I need to update my signature.

jhbowhunter: I didn't get the link to your thread and would like to check it out.
 

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Discussion Starter #11
Exact same thing was happening to me on my truck. Here is the thread i started on it. At the end of the thread I posted what fixed it for me. Hope you find it...
I found your thread but your solution didn't fix my problem. U joints and driveline balance were the first things tried. Thanks for your input anyway. There were lots of good points in the thread.
 

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If happened after trans install , should look closely at components the shop had to remove/disturb for that work.
Things I would double check.
Engine mounts?
Trans Mount?
Check torque of fasteners on bell housing,flexplate,converter,crossmember, T-case to overdrive, driveshafts to pinion yokes?
FWIW, the elephant in the room is 2 piece driveshaft, which if your planning on keeping truck in long run best to get quality 1-piece ie Driveshaft Specialist Inc
 

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This started when my son had the transmission rebuilt. Definitely start here, and I would have the trans shop help with the fault finding. y guess would be a loose bolt on flex plate or damaged flex plate. Not that I know a lot.
 

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Wierd, my truck has a vibration 65-70mph. New wheels and tires, new drive line, free spin hubs in the front. Nothing seems to make any difference, guess it's just the nature of the truck.
What kind of tires are you running, this can make a big difference
 

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I had something similar, but I also felt in when in went in reverse. Turned out to be transmission mount. You can't tell just by lookin it either. Best thing to do is pop the hood have someone look at the engine. Other person put it in reverse with their left foot on brake. Give it some throttle with your right foot. See if you hear or see anything.
At highway speeds it's hard to hear if anything is loose.
 

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Discussion Starter #16
I got to talk with the shop foreman at length. They did a lot of testing and can duplicate the vibration with the rear of the truck on stands. It appears to be a rear driveline resonance that is being excited by something else in the driveline. He said he has seen such a thing being caused by a bearing in the transfer case but inspecting the bearing requires expensive exploratory surgery which he wasn't about to recommend. We did drain the T case oil to check for metal filings that would indicate a failing bearing and found no metal. His next step is to go over the transmission. I told him I needed the truck to haul lumber to a building project so would like to take it out and drive it some to see if anything had changed. He was OK with that and said to bring it back when ever I want to continue the search.

Thanks for all the suggestions. I will update the thread if I ever find a solution.
 

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I had a very similar situation with a 99 3500 I had bought used. I found it to be the clamps that retain the u-joint to the rear yoke had distorted enough to allow the u-joint to wear down the locating tabs on the yoke allowing the drive line to run off center. I repaired the tabs then converted the yoke to use u-bolts instead of half moon clamps, no more problem. Good Luck
 

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Rather than the rear driveshaft, could it be the front driveshaft causing issue? If the rear joints were worn, fonts couldn’t be far behind? Thinking out loud here


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Sound like a problem I had , replaced front drive then had vibration, had front driveline rebalanced no help finely after 30k miles decided it was time to replace rear joints, problem solved, had 1 dry bearing cap
 

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You probably tried it already but if not taje the driveshaft off and turn it 180 degrees.
It could be that when the new ujoints were put in they were tight in the yoke and the shop didnt tap the yoke to relieve the tension. If this is the case then they more than likely wont do it on their iwn
My truck has what feels like a driveline vibration at 71 mph when accelerating slightly or climbing a small hill, ie. light power load. The speed is very specific and seems to have increased a bit with time. This started when my son had the transmission rebuilt. The transmission shop replaced the U joints and balanced the drive shaft at the same time. My son noticed the vibration but since it was relatively small and only happened at the specific speed he ignored it. Now that I have it and my wife is the dominate driver, that's another story, she told me to get it fixed before it got worse and something broke. I knew it could be difficult to isolate but figured it was just a shaft balance that hadn't been done correctly. Shop first reported the U joints were showing wear and since they needed replacing would try that first. Then they asked to have the shaft balanced which I OK"d.
No change in vibration. Sent the shaft back for another try, no change. Then they swapped the shaft for a different one from the balance shop and again no change. They have now opened the differential to check it to see if the vibration might be there and also checked the transfer case and have found nothing. They even swapped wheels and tires from another truck to see if it is a tire issue, it isn't. Shop foreman still thinks it is shaft related but I think there is something else we are missing that may be obvious when we find it but right now it is a mystery. All help will be appreciated.
 

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Are you feeling the vibration in the steering wheel, seat of your pants or in the floor board or pedals?
 
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