Another Toytec Vibration Question

To begin, I've searched to the end of the internet and back, but here's my issue:

I spent 8 hrs at the dealership yesterday for a drivetrain vibration at initial acceleration to ~15 mph. They knocked out a TSB for drivetrain vibes and troubleshot the vibe that was still there (which is a result of the lift anyway). I convinced the mechanic to shim the carrier bearing about 3/8" with washers until my Old Man Emu FK29 drop kit arrives.

The TSB is done, axle shims are present and oriented correctly, and the CB is currently dropped ~3/8". The vibe/shudder is still there. Am I missing something?

Thanks...

'13 Tacoma TRD Off-Road DCSB

 

Is it a vibration, or an axle wrap issue? You may need to slide the driveline apart and pack the splined section full of grease. Just make sure to keep the orientation correct.

 

Vibrations on acceleration are a known issue even on unlifted tacomas. Had the tsb done to mine, still vibrates.