I have researched the 4:56 gear set up for our trucks. There is a Company in SoCal that is an installer of rear ends (he is direct wiyh Dana). He spoke to Dana about changing from the 4:11 to the 4:56 grears. Dana Corp. says the gears will be released in Aug. to do the job properly. I said some of the guys are already doing it what gives. He stated the only current way of doing it is with a ring gear spacer. He (DANA) also said he would not recommend any one to do this as it is inviting disaster. The gears Dana makes are designed with a special "CROWN" to fit the Dana housings we have in our SRT-10's. His shop is in SoCal (Orange County) and will be able to do installs. I also asked him about guys that cant bring there trucks here,he will ship out the gear sets. As soon as he has a price and inventory, I will post and everyone interested can go direct. He has the first to be shipped comeing to him. Larry