Thanks much guys,, I sure like the help I'll tell you.. I've NOT seen anything like this at all, in my time. The transfer case is off the yoke on the first axle, then it comes way up to the driver side, over the axle housing, to grab the rear axle drive shaft. I know u joints need an angle to run right (most the time somewhat upward), this is up and off to the side of the truck, the rear axle drive shaft has to go. Yea, Grigg, if you would please,, I'd sure thank you.. I do have pic's of it if anyone wants to see it.. Their not the best though, its hard to get a good clean pics of it even under the truck. I sure can see how it would vibrate if one did not engage it after being stuck. ARE they gear or chain driven? It is a rather big housing for it.