Vibration 5-10 MPH after lift

I installed 5100's all around and an a Toytec AAL in the rear. I also installed some shims as well. After the install, i notice that the truck has a bumpy vibration coming from the rear between 5-10 MPH. I only notice it when starting from a stop. Any ideas what could be causing this? Should I remove the shims?

 

Damn chris, you sound so certain. I did install the Toytec shims. Arrow up pointing towards the front, the thick part is to the rear of the truck. Above the axes, below the overload leaf. So a carrier bearing spacer should fix the problem? Is it easy to isntall? I'll go ahead and place an order for a set from Toytec.

-Denny

 

for the carrier bearing spacers, you could probably go cheap and just use some thick washers for each side that bolts to the frame....same amount for each side. just a thought anyway.

 

Im going to have to try this also, My truck is doing the same thing.

 

Mine is doing this also. I'm off Mon-thur next week if I get the tranny swapped in my racecar i'll add a few washers and see what happens