Freightliner shaking, vibrating at 60-65mph

Uh, why are you doing this? Do you have the jackstands under the frame or the axles? If the axles are hanging, that's my guess.

Did the truck shake at speed on the road?

U-joints maybe?

And lastly, it's a Freightliner, they all do that?

 

Damaged driveline/out of balance, u-joints, motor/trans mount, wheels/tires out of balance/slipped belt?

 

Hi WildBill, so many things it could be. If a U-joint is that bad, you'd probably hear clunking, but I'd check that 1st. Other things could be: wheel bearings, out of round or unbalanced brake drums, tires with broken belts, worn splines on axle shafts, or possibly transmission bearings. 65 mph on jack stands? You're a braver person than I am.

 

they're called Freightshakers for a reason

 

Could be a bent or unbalanced drive shaft. Check to see if the weights are still on the shaft. I knew a guy that worked at a truck repair shop, and a guy came in saying he had a awful drive line vibration. My friend looked under the truck, and the drive shaft looked like a cork screw. How it would even move like that they couldn't figure it out.

 

Carrier bearing is another thing to look at.

 

I would start with looking at tires/rims, separating belt in one of the tires, when it was road driven last was it shaking bad on the steering wheel also or just the whole truck? Try and pin point front or back or as was earlier suggested a bad U joint or drive shaft. Not sure your going to figure it out on jack stands. Any work on the drive line recently? How many miles on the truck? How many miles on the current rubber? Wheel seals leaking? Does the truck wander/track ok?

 

Bad idea running it like that on jack stands. This throws the drive train out of correct alignment (driveline to axel angle) and quite possibly causing the shake. If you are experiencing problems while running down the road under load or empty, you need to be specific and detailed as to what is happening under what conditions. If you have a vibration, at what speed, what kind of load, what are the road conditions, is it while accelerating, coasting, decelerating and where do you feel the vibration, in the steering wheel, in your seat. Being able to isolate the condition will give you a good idea as to where to start in troubleshooting the problem. Good luck.