sounds like a worn u joint on the rear drive shaft. did u check it for any play? as u accelerate the centrifugal force on the u joint actually holds it together a little bit making it seem fine, but its not until u let off the gas that u can then feel the ujoint vibrating. ask me how i know

 

The rear driveshaft looks fine no dents cracks anything like that. No play in the u joints either

 

is the tranny shifting okay?

 

Yes

 

Im gonna agree with motor mount

 

I'll take a look at them this weekend and see what I find out

 

my truck vibes mostly when i let off the gas and start to brake.( no its not the rotors and brakes) i did check my front Drive Shaft it had play where the tube meets the grease fitting but i greased it and i thought it did something but that wasnt it. i do drive over curbs quite a bit. no lift on the truck. my shocks i know arent good. but all my tie rods are good not much play and some off the boots are ripped.

 

Sounds like the same problem. Make sure you check the other things we mentioned and I will let you know about the motor mounts tomorrow.

 

the u joints have absolutely no play. when the front end is lifted i spin the front driveshaft by hand and theres only play in the diff. thats it. i was driving today and i get most vibration when stopping. it seems like its coming from the front left wheel theres some sort of clicking it seems when coming to the stop at 5-10 mph???

 

Also the truck had no rear brakes so for a long time it was doing all the stopping on the front and the calipers took a beating. warped rotors pulsating the piston of the caliper so when i take the wheel off i can move the calpiper its not holding the pads to the rotor like it should can that also cause the vibes???

 

I'm not sure, but I know if your rotors are warped that can cause a serious vibration when braking. I don't have a clicking when I come to a stop. If there is play at your differential that might be another problem though...