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My brother and I just fixed this in his dana 20. We to tore the stupid thing down several times. the jumping out of low range with a twin stick was part of the problem. we installed a 3 to1 gear set. make sure the out put shafts are within spec on the end play and the pre load on the bearings is very important. It takes an inch pound torque wrench with a dial gauge on it to check the rotational load. this is very important. As far as jumping out of gear, we had to make the low range detent notch deeper by about .050 thousands. I ground it out with a dremel tool and used a cut off disc to to do this. I checked my progress by using a dial caliper to the bottom of the of the u shape in the shaft. We put it back together and installed 3 no. 4 machine washers as spacers to tighten the spring pressure on the detent ball and spring. Put in the ball and spring and then the washers, install the retaining bolt. I know it's a pain in the butt we took it apart way to many times, and swore if this didn't fix this last time we were going to blow it into a million small fragments with tnt and throw the remains in the deepest lake we could find. His jeep is using a case from a 76 ford bronco. I went by their directions and specs on the bearing load. the twin stick shift rail was our own doing with a little internet help from a bronco web site. Man I hope this helps you out because I know exactly what you are going thru. By the way this did fix his problem and he's been playing pretty rough with it ever since. Good luck!
