It wouldnt be worth it. They would charge you way to much at the dealer. Also if your going to change the gear from a 3.55 go for a 4.10 or 4.56. I would just stay with the 3.55 You have the posi and thats more important then the .37 differance in gear.If you have a 3.55 and want to upgrade to 3.92 would the dealership swap it out ? Would it be to expensive to do it that way?