Wow I'm in similiar boat but haven't pushed dealer to do anything because the 3 times I've asked to check out it's the same or the one time tech drive with me in passenger his way of driving seemed to act as if covering up symptoms to normal driving but never went far enough to stay at constant speed to feel. Just accelerate fast to high speed and slowdown around the block. The vibration with mine goes along with a whirring sound that when is happening at any speed I can flutter the gas and it's goes exactly with it making me think it could be internal in transmission yet the vibration driving is felt like a gallop shudder with sound going with it and sometimes mostly when accelerate during coast it acts like it's missing beat ever so lightly but can be heard and in tune with the feeling of it in gas pedal. So it ranges from common diagnosis symptoms of unbalanced wheels, wheelbearing yet no sign of that when check , and misfires plug or coils yet no code or tach change , at stop in park or gear getting a massage chair vibe so what's moving mechanically i think pistons firing out of order but engine seems run fine besides shaking and usual sounds but reminds me of a diesel. I think driveshaft when in motion like a u joint but they are unserviceable sealed and don't show obvious free play when checked one had little red rust color around dust cover but no sign of grinding so surface rust I am to believe . Not lifted so no drive shaft angle to cause . Front passenger cv axle has what I Ssume normal play left to right up down no crunch or pop issues driver cv still has needle bearing i have kit for bushing but not lifted at 17000 miles and has hadissues since5k when I got it . The used Toyota Sales manger said why worry drive it until it does show its face and breaks then we'll fix it its under warranty . I have anger problem and have day dreamed of beating these ppl half to death and burning down entire dealer ship. And even findi g engineers cut theme all over and poor lemon juice on them and beat there family and make theme watch for allowing such things to be and do nothing . Mine in financed threw bank I can't just demand to fix and it's my hard earned money and life spent to have to stress over it now multiply that by thousands of tacomas and lives and time and stress . I want to watch theme erd until they comply and make it better . I keep alm though ans the 3rd time I had brought it up and mentioned atlest try tsp buliteen for dampener under cabe to muffle whining of rear diff vibration threw cabe which I had it printed out they had no clue and had to study it and had for 2 days to do once parts came in and it did nothing whatsoever. Told it was aggressive tires I'm hearing so changed tires less aggressive still sound vibration just at a different tune from different r weight of tires in rotation and was totally different seperate sound . . I smile and say ok looking like the fucking joker they think it's a joke. They get paid to tell you bull shit while you pay for the stress . I've contemplated suicide with thus truck being fuel to the depression that creates that thought of action. 800 month payment pit 7k down payment and let theme talk. Me into 4k toyota platinum care plan which is literally nothing nothing at all just talk but it's in with the financing . The anger the want to put cold steel in everyone if those mens mouth and watch theme cry begging no no you say why not do the right thing listen to me and do what it takes to make me fucking happy that my only ride I an enjoy replace it with same with no errors . No no no thats too much for this world now days . Better off without you click li k boom . Fuck yoga especially one I qent to . .maybe others are honest and coukd help but these mofos need to die