I've experienced this same type of vibration problem with my '02 Tundra 4x4 TRD.
Mine exhibits itself as a rhythmic pulsation of vibration when driving in 2WD between 30-40 mph and temperature is about 70° and below. The vibration eventually receeds as the vehicle "warms-up" from driving.
My dealer says that Toyota is aware of the problem. They (the dealer) described the cause as the high viscocity of the cold grease in the transfer case providing some coupling to the idle front drive train and causing it to vibrate.
As of my last check, Toyota did not have a fix for this. I'll be checking again soon, and I will post if I have anything new.
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2002 Tundra SR5 AcessCab 4x4 TRD Off Road w/ LSD
Supercharged, Unichiped, IPT, S&S Headers, Spintech, Walbro GSS342, DR Coilovers, Hellwig Rear ... more
G-Tech: 0-60: 6.97" 1/4 Mile: 15.36" @ 95.4 mph
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