Ok So i see this has been beaten to death back in 2003 but now i am confused. My truck does not have a LSD i jacked the rear up and the wheels turn in oppisite direction. There is a big red sticker on my diff that reads "USE LSD OIL ONLY" whats that all about??? Should I just contact the dealer on this? I have had this truck for a bout 20k miles and bought it used with 120k miles on it. I dont think the front and rear diff oil had ever been changed I dont think the tranny has been flushed ever and I dont think the transfer case has seen new fluid ever.... Any recommendations? I am looking to do the transfer case front and rear diffs myself.