Guess I've been lucky with RRO, because I have their SPOA kit, the JPeaterYJ kit, and the OTT steering setup and had no problems
with long order fulfillment times or missing parts, etc. Been quite awhile since I've dealt with them though.
I like the early Toyota PU front driveshaft ('85 and before) for the rear as it is nearly a perfect fit for length, the u-joints are much stronger, and if setup properly - absolutely no vibrations. The setup is pointing the rear flange directly at the Tcase when welding your SPOA spring mounts.
The drivesahft will require an adapter at each end and drilling out the flange holes for larger bolts. 4X4 Fabrication has these. Also has
a nice tranny mount that eliminates the existing crossmember under the front of the Tcase. This allows the front driveshaft to dip a
considerable amount downward.Also makes removing either the Tcase or Tranny a breeze. Used a TrailTough 2" yoke to extend the front driveshaft with no problems.
To address axle wrap, I used 5 leafs for the front end. Took 2 sets of 4 leafs for the rear, cutting the eyes off the ends of 1 set, mounting those under the eye leafs on the other set. Then cutting the next leaf on the 1st set so the cutoff end extends just past the rear of the
spring pack plate on top of the eye leaf. This puts 6 leafs directly over the axle. I have'nt had any wrap problems with this setup running a 6.4 to 1 Tcase. Doesn't seem to affect articulation at all.