Good day everyone, I seem to be having an issue with something in my drive line.
Truck info: 450,500 miles
Truck: 10' Mack CH613
Motor: MP8 (500 ponies)
Trans: Eaton 13sp (Model: RTLO-16913A)
Not sure on rear ends other then they are both Mack's
We bought the truck about 35k miles ago. Not sure on prior history.
The issue starts in 7H, but once I grab the final hole (8L and 8H) respectfully 11-13 gears.
It is inconsistent, meaning the noise comes and goes. It's like a rattle/grind/chatter/rumble. (I know that's alot of descriptive words, just trying my best to paint the picture) the sound becomes more prevalent as I accelerate, and will come back if I let off. I have had tires balanced and drive line has been greased every other week to every 3 weeks depending on how hard we run. The noise reminds me of when the drive shaft is out of alignment, however the noise is only in the mentioned gears and at all rpm range. U-joints and carrier bearing are all good. However, when inspecting the driveshaft we found it has about 3/4 to 1" of play rotating from center.
I hope with the information provided, maybe someone could help me pin down where the issue is. I'd prefer not to run it till it blows but I don't really have much of an option as a shop isn't possible at the current moment.
Final drive chatter/grind
Now, the biggest question I have, in the event of a bearing failure, it won't lock up at highway speeds will/could it?