rear drive shaft

Okay so my rear driveshaft came off my 88 ranger 7.5". Pulled a new one off of a 94 ranger that will fit. Then I screwed up by pulling off the rear differential pinion nut without marking a reference. My questions are: How do I know how tight to turn that replacement pinion nut? How do I...

Hey there I have an 85 BII with the auto trans and currently not moving due to a broken driveshaft, I have gone to every wrecking yard in town 5 total and every single ranger and bronco I find is missing the driveshaft, is this a common failure ? the drive shaft i have is the one with the two...