2019 389 driveline vibration

my 2014 i lugged to a 1000 rpms never once had a problem with the harmonics. should not have to run the truck at high rpms which is burning more fuel in order to not have a vibration. i have a friend with 7 brand new kw's same set up pulling tanks in the mountains and truck is smooth in a pull as it is on flat land. even when lugged down to 1100 rpms. thanks for the input every little bit helps but i still believe there is an issue somewhere.

 

Might be an injector. I was under the impression from Eaton that the pre-damper clutch was required with the Cummins X series engines.

 

I sure do feel sorry for these engines getting downspeeded. It just kills them. The graphs might say they make peak tq down there but it sure aint good for them. Of course everyone pushes the MPG thing but really how much fuel are you actually saving when your gonna have to inframe the engine sooner because the liners have been shaken out of the block, let alone the added maintenance to the emissions system because its been run to cold from low rpm’s. Get the RPM’s up in that 1350-1600 range when pulling big hills and the engine will last a lot longer as will the emission systems because it will actually be able to clean itself properly. Water temps, oil temps, trans oil temps will all run cooler at the higher rpm as well. Yea sure you might save a few gallons running at 1100 rpm but how much fuel could you have bought with all the money spent on clutches and driveline parts?? What about the money spent on having to do an early inframe ?? You’ve gotta look at the big picture and your current setup is telling you that you are not driving it right. That x15, if thats whats in the engine is a totally different animal from the ISX that was in the previous truck.

 

Lugging engines is how you get sunk liners, I also think it eats cranks. My e model has 1.8 million on it and still running the crank it had from new and never been decked or counter bored.

 

Same here, bought new 2018 389 Pete and nobody can figure out the vibration between 57 to 65 mph. Hope someone figures it out soon

 

I guess it's my turn, unfortunately. I've got a 2020 389 565hp 2050tq 18spd with 56k miles and this vibration deal has just started on mine... Does it under a load typically between 64-75 mph which is generally where I roll at...

When coasting at those speeds it's fine but when pulling the floor right at my feet is vibrating along with the peddle... Sounds like something is rubbing really bad...

Sounds like this issue started on the 2018 year from what I've gathered here, you would think they would have the issue fixed on a 20?


This stuff gives me a headache.

 

It’s suspension related your air ride is too low

 

Suspension is too low or angles are out or both and the cab air is too high needs adjustment