Quad cab shafts:
52123161AA 1 8 42, 81 DG8 Has Yoke With Damper
52123161AB 1 8 42, 81 DG8 Has Yoke Without Damper
Regular cab 8 ft box\quad cab SWB shafts:
52123122AA 1 8 41, 62 ET0 DG8 Has Yoke With Damper
52123122AB 1 8 41, 62 DG8 Has Yoke Without Damper
I would guess u-joint life isn't any better or even worse because of the angle and they are non-greasables. Just gets rid of the center support bearing and the problems it causes.