This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
There is a known problem with some Tundras in which a "clunking" noise is
coming out of the drive train. The known solution has been to regrease the
components of the drive line. This has been a longtime acknowledged issue with
both Tacomas and Tundras, with no long term ill effects.
Some owners of Tundras have said that a Hellweg rear anti-sway bar has removed
the "clunking" noise due to a tightening of the overall suspension. Long term
testing will show if this is an effective fix.
Other complaints have been that while shifting from 1st to 2nd gear, a pause
will occur, then a great surge of speed will force the transmission to catch
up. The culprit has been a clogged valve body in the transmission.
 
Continue to: