found this on sky-manufacturing's website, looks like a reasonble idea



and his write up....
Need a little extra axle beef? This is the kit. Running 37" + tires on a Toyota axle is pushing the limits of the stock parts. The Birfield eliminator gives you some room to work with. Tested on various competition buggies, run in the real world, used by us.
The axles are constructed of 4340 high nickel alloy, with a 760x u joint. You may upgrade to CTM's or Aussie Joints. Kit includes all new axles, spindles, seals, u-joints, and instructions.
Currently I run either 37 inch MTR's or 39.5 TSL's. Recently while on a snow run I backed up a dirt bank with my 5000 pound 4 Runner, running my 37's. This wall was about vertical. I turned my wheels to the right full lock, my stops are actually turned in as you can turn tighter with a u-joint, and tried to move forward. Apparently the ditch was deeper than it looked, and covered in 2 ft of snow. I was digging down, not moving foward. So like most people, I took the motor up to 4500rpm's and dropped the clutch in reverse, full steering lock. Last time I did this with a set of HD Birfields and Chromo inner shafts, I spit the inner cage out of the Birfield. This time I still had no movement, but nothing broke. 3 more tries and I was moving again, much too the amazement of the other Toyota owners in the club, with no broken parts.
price

Price- $399.00 SPECIAL! (U.S)+freight
any thoughts
