[antisocialspeed]

I have a vibration/shudder I can't figure out. I replaced my transmission mount with a prg and it does vibrate the cab at idle, but no big deal. However I have a bad vibration and shudder that starts around 50mph gets better around 75 and smooths out at 80mph.

I put new tires on around the same time so I figured it was the tires. They have been balanced 5 times, yes 5. And one tire was replaced as it was suspect. There really has been no change in the vibration. I notice it through the steering wheel and at some speeds even through the cab and can see my passenger seat shake. Can't really feel anything through the shifter though. I am at a loss. As anyone experience vibrations at hwy speeds from the prg trans mount? Any ideas what it could be?

2005 le 4x4. All fluids replaced. Rear ujoints replaced only to find out they really weren't bad. Front ujoints are newer and look good, just greased them. Had an alignment done after the tires when the ujoints were replaced. I'm stumped and kinda frustrated.

 

[rcsilver&blackT]

I had some vibrations in almost all speeds for about 3 years with my MT tires size 33x12.50x20 Federal Couradia .Not too bad after balance but kept coming back after few thousand miles.Yesterday I replaced them with Thunderer MT tires with the same size.The result was very good and very happy about them.Vibration was completely gone.I have been driving my truck a lot yesterday and today and I really noticed that they have way less noise that my old tires.I will never buy Federal Couradia MT tires anymore.

 

[osiris10012]

My prg tranny mount definitely caused additional vibration, but not a bad vibration. Also the additional vibration I got is worst at idle and then mellows out with normal driving. It is felt at all speeds. By chance did you also get new wheels? What tires did you go with?

 

[El Mamito USMC]

any other option for the tranny mount?

 

[antisocialspeed]

I went with the bfg ko2's. After spending all day at discount tire yesterday and multiple balances and a rotation the manager went for a drive with me. He wouldn't drive my truck just went as a passenger. He simply stated what I felt was just the road.

So today I went for a really long drive and the vibration seems to come consistently in waves...if that makes sense. Like it will vibrate for 2-3 secs then smooth out for 2-3 secs, vibrate than smooth out... i let my brother in law drive the truck and he could feel it too.

 

[osiris10012]

I know what you mean. When I got my 20x12's I noticed a vibration. It was driving me nuts. Got my set up re-balanced several times and realized the increased width of the wheels combined with the much more aggressive offset was actually making the road feedback more noticeable. Might just be the bfg's are doing something similar due to being a stiffer more rigid design.

Edit:
Forgot to ask. What psi are you running in the new tires? If it's to high this could cause additional road vibration feedback.

 

[toufue_yang17]

Have you checked the balance on the driveshafts?

 

[antisocialspeed]

Weights are still on the drive shafts. They don't need to be rebalanced do they?

 

[JonFTC]

also check your u-joints and wheel bearings.

 

[antisocialspeed]

U joints replaced 18k miles ago and appear to be good. What's the best way to check wheel bearings? I can't hear any sounds like grinding or whirring though.