Couple of questions ...

yes these men gave u . 2+2 advice. weights on all mopar parts are 2 balance that product. ie that part. then they all work together. drive shafts that takes internal trans repacing. the one you need to measure is miss matched look and u can find . or stop have custom made. slip joint were on all early mopars .late 64 all 65 had slip joints . to get 63 or some . u have a miss matched stuff.

I'm not sure what "2+2" advice means but I know for a fact that all mopar parts are NOT balanced individually. For a 5.9 magnum, which is externally balanced, you have to have a harmonic balancer that is balanced to work WITH the internals of the 360. You also have to have either a flex-plate that is specifically balanced for a 5.9 magnum and a neutral balanced TC, or a TC with a weight, and a neutral flex plate. Don't use them on a 5.9 and it will shake itself apart.

The "slip joint" you are referring to is not the same thing as a "slip yoke". The "slip joint" is what I called the "ball and trunnion" drive shaft, and is the correct term. A "slip yoke" is what's used to connect a "standard" drive shaft to the transmission. The former was 65 and older on A bodies, the latter 66 and newer. The trunnion style of connection has no fore and aft movement and relies on the ball and trunnion style drive shaft to "adjust" for distance variations etc. The slip yoke on later transmissions, does this in stead of the drive shaft.

Thanks for your input.