2001 Tacoma Prerunner vibration at 20 mph

I bought a 01 tacoma with 220,000 miles about ^ months ago. In very good condition. The truck just had the transmission rebuilt at atlas transmission. the warranty does not transfer. I just noticed a vibration at 20 mph when i am slowing down. the fluid is fine in the transmission. anyone else having this problem. any suggestions before i go have the transmission looked at again I have saw some threads about the drive shaft.

 

I have a similar vibration at 20mph. It's on a NEW 4 week old double cab 4x4. Could be unrelated but the speed is the same on both of ours.
Mine is really subtle but noticeable fast vibration just at 20mph.
I didn't have it before I had the Harsh Ride TSB done. Now that it was done I have this steering wheel vibration.
I'm taking it in on Monday. If it gets fixed I'll post up on what it was.