Vibrations at 21-25 mph

Hey people, new here and was wondering if anybody ever had issues with rumbling strip vibes at 21-25 mph? I have a 22 SR dbl cab with a 2” lift. Also vibes go away once in neutral. Took it to dealer and they can’t figure it out. They also said torque converter is good? The next step is to let an engineer look at it but they say they won’t cover anything if it has to do with the suspension because of the aftermarket lift. Also I bought it with the lift so I’m not sure if it was there before.

 

Probably needle bearings .

 

I thought so too but that wouldn’t go away once I slipped it into neutral? I’ve also put it in 4h and does the same thing. Only smooth once I put it in neutral.

 

2 degree tapered shim under rear leafs. Report back

 

It has 1 inch blocks under leafs. I also thought this could possibly be the issue. Was just weird it all stops once it’s out of gear.

 

Could be torque converter shudder.
Does it match what’s demonstrated in this video?
https://youtu.be/4EOm84AuRzU?si=ODXuYo2C9m7N8n_t

 

That seems a bit worse but similar just in a higher gear and it doesn’t go away when I let off the gas. I’m definitely gonna suggest a trans flush. Honestly can’t believe the dealership doesn’t want the money for doing the work as I’m still under b2b warranty.Thanks for the video. I have been searching the internet like crazy to find something and this is def very informative

 

so now with the mods done - lift , regeared , trans flush ,big tires etc , is your Toyota powertrain warranty valid at all ?

 

So, just a reply incase anybody ever has the same problem. After a few weeks at the dealership, they figured out is was pinion angle, which I suspected. No it will not be covered under any factory warranty. Because of the aftermarket lift.I was quoted around $500 to fix the angle, from the dealership.

 

As said above, shim it.