This may be a hypothetical thread but maybe not. I have a 76 FJ40, I've wheeled it a lot, traversed the Rubicon many times. I have an SM420 and a 3 speed transfercase. I'm happy with the low gear but lower would be good. I currently have a spare split transfer case, and would like to run that in place of the 3speed case, but there are other options. Assume for the purposes of this discussion that cost is not a major consideration. I'm looking for bullet-proof, and permanent.. Option 1-Run the current set up, with the risk of a case fracture like Texican recently. Option 2-Sm420 plus split case using the AA adapter kit-looks complex Option 3-H41 19 spline tranny (from SOR) + split case + Mark's gears-tempting all Toyota setup. Option 4-Sm4320 + Orion + Warden's nosecone if I can get one, and forget split case Obviously anything but #1 will involve time and $. Any and all advice appreciated, especially if you have experience with one of the options. I don't want a longer driveline, which rules out a Toybox. I am leaning in the Option 3 direction and do not care about additional gear noise-the SM420 makes that a non-issue. Appreciate any and all advice.