In the U.S. 1979 1985 Toyota 4x4 trucks had Birfield joints in the front axles. (Also Toyota Land Cruisers and Suzkui Samurais had similar setups.) The stock Toyota Birfield joint allows for great motion and smooth operation and will last forever in a stock configuration. The durability is their dowfall though as Toyota hardened the bell of the joint to a point where it didn't wear out from normal use, but with tires larger than 33" the shock loads of fourwheeling tend to shatter the bell of the Stock Birfield. The best modification for a Toyota front end is to install a set of aftermarket Birfields, the best of which are made by Longfield Superaxles ( www.longfieldsuperaxles.com ) They are expensive, but once you put them in you can wheel your junk without having to worry about the Birfs ever again. Before you can install new Birfields, or Longfields though, you need to get the old stock Birfield off the inner axle shaft. The inner shaft has a circlip style snap ring that keeps the inner axle shaft from walking out of the Birfield joint. This video shows how you get the Birfield off the inner axle shaft in spite of that inner snap ring. (The snap ring that is on the end of the inner axle shaft up inside the Birfield is Toyota Part # 9052027091. You can get them from any toyota dealer for around $2 each.