Better Shifting Mopars

get some good mac or snap-on snap ring pliers.
Get some trans gel assembly lube (holds rollers in place making life easy) dissolves in oil
Cut wifes broom handle off (makes good counter shaft tool)
Cut a hole in the top of a metal 30 or 50 gallon drum just big enough that the bearing retainer will fit in it. This allows you to assemble the main case and then drop assembled main shaft in from the top. You can mark the 4 holes and bolt it down if you feel frisky. Gives you nice stable waist high work bench. Does not work with 3.09 64-65 low 1st gear sets or overdrive 4 speeds

One of the best things is understand how it works and why it works that way. Chrysler performance upgrades by Frank Adkins pg 80 explains this better than anything else I have ever read. It is also a book full of a wealth of other knowledge.