I recently installed one on my grandpa's 89 yj. It was a sweet east install. Great looking product it must be idiot proof <IMG SRC="smilies/thefinger.gif" border="0"> Just kidding I agree its kind of not easy to tell if its all the way engaged or not... I just yank REAL hard while rolling (there seemed like it needed differentiation to lock all the way). I did in in 2wd and it went better than in 4wd. I like it better than the suck thing on it before but its still a dana 30 <IMG SRC="smilies/rolleyes.gif" border="0"> He doesnt really need a dana 60 on a stock jeep. But the bettery had corroded the vacuum lines and wouldnt lock correctly when it was working.