05, is it driveline or exhaust induced?

[TPappas]

I have had my truck for just over six months. I have just under 3,000 miles on it most of that is towing our trailer. When I bought the truck I test drove it to 80 mph and did not notice the dreaded vibe that some have.



Recently I have noticed a vibe or drone between 65 and 72 mph. At a constant speed it is almost as if it pulsates. I can feel it in the pedals and in my butt and can hear it more than anything, but there is not enough to actually vibrate the mirror.



Is this a driveleine vibration, or could it be an exhaust drone? If it is the driveline I am going to start doing battle with the dealer, because I question longevity of the truck. If it is the exhaust drone, I would be more than happy to change mufflers and or add resonator to fix it on my own.



This is not towing, I don't drive that fast while towing. Anyone?

 

[Dieselnerd]

There was a thread here not long ago about a similar drone. The conclusion was that the floor of the pickup bed vibrates at around 2000 RPM. Spray in bedliners seem to help. I think it's not going to hurt anything since it's more of a harmonic than an actual vibration. I've noticed my engine seems to have a slight buzz at about 2000 RPM even when parked and in neutral. Like I've said before, these new trucks are so quiet that we notice stuff that was drowned out by the clatter of the earlier engines.

 

[EBottema]

Sure it is not the u joints? Seems to be the troubled item on the 3rd gens

 

[rbattelle]

I can feel it in the pedals and in my butt and can hear it more than anything, but there is not enough to actually vibrate the mirror.

I think I have the same thing. Have had it since day 1, and always considered it "nature of the beast". 48k now and no problems.



Note that the A/C compressor will make a lot of additional vibration when its on. At least it does on my truck. Still not enough to vibrate the rear view mirror, but a lot more than when the compressor cycles off.



-Ryan

 

[JTeague]

It's not exhaust drone. I have had lots of experience with what you describe at work. The problem is a driveline vibration usually coming from the front driveshaft. . The main problem is that the front driveshaft turns all of the time since the done away with the front axle disconnect. To isolate the problem I will mark and remove the front driveshaft and go for a road test to see if the problem goes away. If it does, you that the front driveshaft is your problem either being out of balance or the u-joint angles are wrong. I have cured several trucks by simply unbolting the front driveshaft at the front end and spining the shaft 180 degrees and bolting it back up. Get you a good set of Torx bits and give it a try and see what you find.

 

[Badunit]

Before doing a lot of work, first determine if it is a 2000 rpm vibration or a 70mph vibration. Mine's at 1800 rpm, any gear or in neutral, stopped or moving. Rotating the driveshaft won't do anything for me.

 

[JHardwick]

not to be be picky ... ...

The conclusion was that the floor of the pickup bed vibrates at around 2000 RPM. Spray in bedliners seem to help.

I'm pretty sure it was not the bed floor, but the verticle bed wall behind the cab ... ... ..... I could be wrong. :-{}

I think it's not going to hurt anything since it's more of a harmonic than an actual vibration.

A harmonic is a tuned vibration.





I personally believe almost all of these vibration problems are caused by 2 issues .....



1. ) too many people looking for a Lexus ride



2. ) junk u-joints, especially in the rear driveline



JMO BTW