Vibrating issues

Hello all, i have a 2005 Toyota Tacoma Prerunner. i currently have 150,000 miles. when i start driving i feel nothing but vibration. the truck shifts just fine. smooth. but when i am on interstate its vibrating really bad. but as soon as i let off its nice and smooth. also, just had codes read and replaced cylinder 5 and all plugs. can anyone help?

 

Motor vibrations or driveline? The prerunner trucks are notorious for the u joints going bad because they aren't greasable. On my 07 prerunner the u joints went bad and caused my vibrations. There's 3 of them, also the center support bearing can creates vibrations.

 

well, it seems to kinda hesitate right when i punch the gas. then when i am doing about 40-50 and let off the gas it starts vibrating slightly. all shifting is smooth though. thats why i wast to rule out my tranny

 

also, i grabbed on the the drive shaft and there was no play that icould feel... do i need to jack up to get better results?

 

How are your tires? Is the wheel vibrating?

 

brand new nitto trail grapplers. bought monday. i checked the carrier bearing and yeah.... i can move it around like 2 inches on both sides... is this common in tacomas?

 

It's common, it goes bad pretty quickly on the prerunners unfortunately. Have your carrier bearing replaced, and since they have to take apart the driveshaft it's good measure to have them replace the u-joints as well.
This is as far as I can find the best aftermarket replacement - SPICER DANA HOLDING CORP #5002334
Spicer makes the carrier bearings for Toyota so it's an OEM replacement without paying Toyota markup.