I'm new here, I used to own a 77 CJ-5, but due to having a family so I had to upgrade a bit. I now own a 99 TJ, the only downside that I'm getting so far is the 2.5. I do have a Airraid, throttle body spacer, header and flowmaster so it makes up for it a little bit. I have a 4" rough country suspension lift, 15x8 soft 8 crager wheels, and 33x12.50 mud terrains. All of the suspension and tires is going to be installed while I'm off this week, I was wondering what size gears I will have to upgrade to with the 33's and how soon? Also my check engine light came on, so I to try first I unhooked the battery to reset the computer, when it came back on a week later (about 200 miles) I had the code run at Advanced it's coming back as an auxillary emission code, what is that? Thanks for any and all help, pics to follow soon.