If I blow up the 3.42's in our 2+2 I know who to contact now.
Two other things, the ring gear diameter is 3.875" which is the same as a 12 bolt, but totally different and doesn't interchange. The other is the Fabcraft 3.55" ring and pinion were designed to fit a Series 3 carrier which was originally for the 2.93, 3.08, and 3.23 ratios. They said that carrier was the most plentiful so they made their gearsets to fit that unit.
I purchased the Fabcraft 3.55 gearset when they first brought them out and the box is sitting on a shelf, and just recently went back to Fabcraft and purchased a billet pinion yoke, bearing kit, and other parts. The Fabcraft guys are very friendly to talk to and will spend time answering questions. Eventually the rearend will be going in the '65 Safari wagon.