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Driveline vibration 50-70mph. 6.4/8 speed

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631blackfin

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Hey guys. I own a 2024 2500 tradesman 6.4 w/8spd 4.10 rear crew cab standard bed 4x4.

Just over 12,000 miles I’m noticing a vibration from 50-70 mph in 6-8th gear. Not MDS as I normally turn it off with the gear limit switch.

This is when empty. I pull a 6x12 enclosed trailer for work everyday so truck is rarely used empty. Strange thing is with the trailer behind me there is no vibration.

I’m running the stock oem Firestone’s at about 65psi front and rear. The weights are still on them but I’m thinking it’s the tires. I feel like I would have noticed this for sure if it was there from day one. I’ve rotated the tires once so far since new at about 7500 miles.

Only other thing I’m thinking is when I had the tcase output shaft seal replaced ( around 5-6k miles) under warranty the mechanic didn’t index the driveshaft and was maybe off 90*. I’m not sure that would even matter but ive always indexed them in the past just so I know they go back the same way.

Either way I feel like I would have noticed this at that time.

Truck also pulls pretty good to the right which it did from day one. I wonder if it’s worth bringing in for an alignment and wheel balance?
 
mikef said:
its probably those tires they are known to be junk...
Click to expand...
That’s what I’m thinking. They have some mileage on them now. Weird with my trailer hooked up I can do the same speeds and it’s pretty much gone. Maybe the extra tongue weight on the rear so maybe I should mess with adding 10 psi or dropping 10 psi who knows
 
I don’t think it’s a driveline thing because when it’s happening I play with what gear I’m in and rpm and doesn’t seem to make a difference. Almost just sounds like excessive road noise. Also being hooked up to the trailer I don’t think would change my shaft angle that dramatically
 
So I took a closer look at my tires today and my driver rear tire is in fact missing one of the smaller weights. The clip is still there that goes to the rim but the lead or whatever the weight is made out of is gone. Comparing to another one of my tires it looked to be a .375 weight.

Would that be enough to give me some vibration?
 
A drive line vibration is high frequency, feels more like a buzzing. Tire imbalance is lower, more like a constant tapping where you can count each rhythm. 50-70 as you described is almost always tires. You could rotate the tires and see if the vibration changes for a quick at home check.
 
Scram said:
A drive line vibration is high frequency, feels more like a buzzing. Tire imbalance is lower, more like a constant tapping where you can count each rhythm. 50-70 as you described is almost always tires. You could rotate the tires and see if the vibration changes for a quick at home check.
Click to expand...
Yea I may try rotating them. Just about due for another rotation anyhow. It’s weird how with my 6x12 trailer hooked up there is no vibration at all.
 
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