toytec lift, vibrations, annoyance

[CNJ Runner]

I just installed my toytec 3 in lift with eibach coils and the 5100s and diff drop.I did an alignment. Since then I've had an annoying vibration coming the from the rear. Which I originally thought was a tire balancing problem, had tire balanced and rotated all 4, and the problem is unchanged, in the rear. After researching I've read that this could be driveline vibrations. As it happens around 25mph and settles down, but still noticable, until abut 70 when it comes back like the devil. the 5100's are set to the highest setting. Ive concluded that the only to fix this is to drop the 5100's down a setting, put the stock suspension back in, or sell the truck. Does dropping the 5100s down reduce the driveline vibration? Im surprised there isnt one 4th gen topic about this, since there are soo many that have put in a toytec lift and diff drop. Its annoying to the point where i willing to put the stock parts back in , or just sell the 4runner as is. Any suggestions/advice would be appreciated

 

[CNJ Runner]

the vibration comes from the rear, feel like right. Cant be felt in the steering wheel, can be felt in the floor and seats.

 

[4RBob]

you did tires at the time of the lift? do you have a matching size spare? you could try swapping it in for each wheel and seeing if you can feel a difference.

also, you could pull the rear driveshaft and drive it at those speeds in 4WD.

 

[CNJ Runner]

I had the tires before the lift. Im just going to lower the 5100s one notch and take it from there.

 

[willis84]

keep this updated just ordered this lift last night would like to know how to fix this issue if i run into the same problem