Here is Joe's Tundra.  He was the first to create a highly capable trail rig out of his Tundra.  He was a huge help and inspiration to me during my swap.  Here is how he describes his rig:

"My Tundra was completed in November 2003.

The frame is re-enforced with 1/4" steel plate.

2" tube sliders welded to the 1/4" steel plate.

Rear bumper is fabbed from 3/16" tubing and bolted to the frame and has a detachable drop bumper making it legal in all States.

Front Bumper is an ARB with a 10K Warn winch with 125' of 3/8" poly line.

Front axle is a HP Dana 44 from a 1976 Ford 1/2 ton and has 4:56 gears, ARB locker, Warn Alloy Inner and outer axle shafts, CTM U-joints and Warn hubs.  The leaf springs are 4" BDS.  Steering is hydro-assist hy-steer using a Red Neck Ram and a modified 1990 Toyota pickup steering box. 

The Transfer Case is a manual twin stick mated to a 4.7 Marlin Crawler box giving the Tundra a crawl ratio of 308 to 1.

The rear is a Y-4Link using Rubicon Express Super-Flex Joints, 6" Skyjacker coils and 12" Fox shocks.   The rear axle shafts are still stock but with 4:56 gears and an ARB locker.

The gas tank had to be removed for the 4-link so there is a 35-gallon fuel cell in the bed of the truck.

The tires are 15X35 BFG Krawlers on TrailReady Beadlock rims."

Joe