I ordered a rear 3.42 gear differential and after 2 weeks recieved a 4.10. The 4.10 is a beefier diff but will not work in 4wd with the Front 3.42. Not only the wrong part but very pitted gears, the pin was actually broken off inside, extremely rusted, the pumpkin cover was cracked in a few places. They claim to check for these problems and stand behind their parts. I called and talked to Kevin and Brian. They did not believe that I received the 4.10 wanted pictures and that the wear and tear was normal. To return i would have to pay the freight and 20% restocking fee. When received they would "get back to me ". These guys were extremely condescending to me and less then helpful. If you send the wrong part, stand behind It. Make it right. I wish i had read reviews before ordering from carmonkeys.com Mischelley, Ruidoso New mexico