Re: dana 18 question
Bummer.... The original TC was a large hole, 1.25-inch shaft model 18. If the drive-line is earlier, like you suggest, like 50's, or 62, you will likely find the 'medium' shaft model 18, and you can measure it at the back-center of the case. If it's as old as you think, you might find a 1.125-inch intermediate shaft. In my opinion, not quite so good. The large-hole, 1.25-inch model 18 seems to be the most sought after, and they came stock on the V6 Jeeps, 66-71 (as well as other models and years). The large-hole model 18 has a 2.46 low ratio, where the other two model 18's have 2.43, and 1.97.
The CJD post about removing the brake parts is correct.