vibration

I have a 06 double cab with 165,000. I just started getting a vibration at any speed that only happens when I'm on the gas. Goes away while off pedal and coasting in neutral. U-joints and carrier bearing replaced last year. Driving me nuts even though its not real bad...yet. Not an engine vibration I'm sure.

 

I am a little surprised a real mechanic has not hopped on this by now. In the meantime I can attempt to give you some ideas to consider. With the thought that the U-joints and carrier bearing was replaced last year I would start there. If your driveline indexing was kept, not rotated 1/2 turn the it might be a loose part. Apply your emergency brake, put your truck in neutral to unload any torsion on the driveline. Then check you carrier bearing bolts for centering, torque and any play in the vertical and lateral axis. Same with the U-joints. The vibe happens under rotational torque loading so look for lose part or if your carrier bearings alignment has moved off axis. Vibration is mechanical, the vibe is caused by movement in the driveline under load or torque, so a loose or worn part more than likely will be the source.

 

An aftermarket Carrier Bearing will only last less than a year at most from readings. Check to see if its deteriorated already.

05-06 years have problems losing the transmission (mount) bolts on 2wd models.

 

When the driveshaft was taken off to replace the u-joints and carrier bearing, was it put back on exactly how it came off? There is a balancing weight of some sort on the driveshaft if I'm not mistaken, and it could cause some vibration if not put back on properly.