I can't seem to find any information on acceptable drive train play. My 2007 commander QT II 4.7 ,107000 miles, has vibration /clunk issues. I found I need front diff. bushings. I also feel / see 1/4 in. rotation of front drive shaft play before inside CVs move. about 1/2" between moving front drive shaft ,before motion at rear shaft U joint. probably Xfercase chain slack. I'm not quite ready for dealer to tell me I need $10,000 in repairs. It seems to me a drive train with 8 CV/U joints,2 splines & chain in Xfer case along with 3 differentials, might have some play in drive train, but I could be wrong. It has happened once or twice in my life. Thanks, Art.