Drive train vibration
JK Jedi
Joined: Apr 2008
Posts: 4,470
Likes: 1
From: Westchester, NY
I get a similiar one at this speed depending on what gear I am in. Basically I have found that when the engine is sitting around 1600 rpm it sends a bit of driveline vibe through the floor. I have owned a lot of suvs over the years and everything from my 04 4Runner to my 06 Denali has had slight drivetrain vibes at different speeds/rpms. Is it annoying? Yes. However, I would say some vibes are within spec and would be close to impossible to isolate. I had an 01 Land Rover Disco that I bought new and it had a driveline vibe around 65 that you could feel through the floor. After many repair attempts it was finally cured by replacing the rubber isolator on the driveshaft. A few thousand miles later it was back and stayed with the truck until I sold it with 75k miles on it and never got worse. Sorry for the long winded response, I encourage you to try and isolate it and fix it, but if you can't, remember a truck is a truck and I think you have to be willing to accept a few things.
JK Super Freak
Joined: Mar 2007
Posts: 1,441
Likes: 1
From: Gilmanton Iron Works, NH
It is the TC. The TC is "trying" to decide if it wants to lock up or not. Common to all Chrysler vehicles that use the 42RLE. This tranny is a POS. Can't wait for it, or the engine, to puke so I can replace them with something that works. 
Thread Starter
JK Enthusiast
Joined: Aug 2007
Posts: 273
Likes: 0
From: San Antonio, Tx
Thanks for all the replies. Mine is a standard so it's not the TC. MattsO8, thanks for your explanation of things. It might very well be that this is normal, it's been like that since new (current mileage 16,900). I have one saying it's not normal, and a dealership says it is 
I'm concerned because I will be installing the TF 2.5 coil lift and 35s so I wanted to get this issue figured out prior to mods. Guess I'll go to another dealership and see what they say. I HATE dealing with the danm dealerhsips.
Again, thanks all and have a great New Year!
I'm concerned because I will be installing the TF 2.5 coil lift and 35s so I wanted to get this issue figured out prior to mods. Guess I'll go to another dealership and see what they say. I HATE dealing with the danm dealerhsips.Again, thanks all and have a great New Year!
JK Enthusiast
Joined: Jul 2008
Posts: 110
Likes: 0
From: Knoxville, TN
Thanks for all the replies. Mine is a standard so it's not the TC. MattsO8, thanks for your explanation of things. It might very well be that this is normal, it's been like that since new (current mileage 16,900). I have one saying it's not normal, and a dealership says it is I'm concerned because I will be installing the TF 2.5 coil lift and 35s so I wanted to get this issue figured out prior to mods. Guess I'll go to another dealership and see what they say. I HATE dealing with the danm dealerhsips.
Again, thanks all and have a great New Year!
I'm concerned because I will be installing the TF 2.5 coil lift and 35s so I wanted to get this issue figured out prior to mods. Guess I'll go to another dealership and see what they say. I HATE dealing with the danm dealerhsips.Again, thanks all and have a great New Year!
Thread Starter
JK Enthusiast
Joined: Aug 2007
Posts: 273
Likes: 0
From: San Antonio, Tx
Well, it is hard to diagnose problems for sure over the web, but if it has been doing it since new and not gotten worse it is likely just something your Jeep does. I am assuming if the vibe feels like something from the stock sub it can't be that bad. I know you mention it happens in all gears, but does it seem to happen at similiar rpms?
