Channeled 91
Manic Mechanic
Yes, I've watched the video several times. I'm trying to visualize the oring/seal in a 2wd tail shaft other members have pointed out and its relation to the yoke travel on the slip joint. With as much drop as you have even at ride height, I'm thinking a stock length driveshaft might be critically close to the limit of its slip. Driving over a set of RR tracks even at a slow 20mph for example.
As the video shows the yoke is out about 1 - 1.5 Inches and does not move inward at the time of drop.