I came across a DNE2 overdrive near me and I have some questions about it. I’ve been able to find a few helpful things about it on here. I haven’t got a chance to look at it yet, but the seller said it came off an ‘01 superduty, and that it has a yoke for a u-joint on each end. Also, it comes with the cross member to mount it. My first question is, how can I tell if it’s any good? What tends to break on these that I need to watch out for? Question 2, are they very fixable if it is torn up in some way? Question 3, what kind of prices do these go for? I can find some info about them online but prices are harder to find. And last question, what else would I need to make it work for me? I’m assuming a new/modified drive shaft. I also assume I could only use it in 2wd. My truck is an ‘86 f250 6.9L NA reg cab long bed 4wd T19