My truck starts to vibrate at 50 mph, its not the tires as the balance is good and no shaking in the steering wheel, i know for a fact that the rear shocks are worn out and it doesnt seem to vibe as bad when i have a load in the bed
If the shocks in the back are totally blown, that could be the problem.But, you may want to check the u-joints in the rear drive shaft. (just twist the shaft back and forth while the truck is off and in gear). Look at the joints while you're doing this. If there's clanking and/ or slop of any sort, they need to be replaced. Good luck!
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Could be a wheel, tire, or axle shaft. You could rotate the tires front to back and see if the vibration moves. If it does the problem is one of the tires or wheels. If it stays in the front, its probably one of the axle shafts. It could also be a hub bearing or something loose in the suspension. But a loose suspension part would normally show up when you hit a bump rather than on a smooth road.
A likely cause is the front tires are out of round or out of balance or both.
Tires are the most common cause of excessive vibration at highway speed assuming the hubs are good and the bearings are tight, and the front end parts are all tight and in good condition.
I just replaced 4 tires on my 1997 Cadillac Deville Limousine and it made a great difference in the ride and control, and got rid of a tire that had a 1/4" bump in it as seen by the tech that spin balanced it for me.
Try to have it balanced first, and check for out of roundness, and also inflate the tires to the max. pressure allowed by the specification as indicated by a placard on the inside of the driver's side door.
Good luck on getting rid of this vibration problem at 50 mph.
OK, when the ABS module is unplugged, the same results. That tells me that the ABS system is not working properly.
Did they look into the master cylinder and other abs related components?
Any ABS codes on it?
If steering wheel shakes above 50 mph that's likely to be the tires on it, rather than a brake problem.
Have tires balanced and rotated and inspected for out of roundness that might cause vibration above 50 mph.
I have this same car with exactly the same problem. Begins shaking at 40mph and stops shaking as soon as you let off the gas, but then begins again as soon as you press on the gas and smooths out as you get over 50. And the shaking is not felt through the steering wheel. Solution: Replace the transmission mounts. There are two of them, one on each side mounted on the frame right next to the shock strut. There is also a front and rear engine mount, but I replaced the two as described and shaking is gone.