I subscribed to this thread -excitedly hoping to observe a JK enthusiast do some pretty heavy installation himself of a product I have recently seen come to market and wonder about- only to find 4 posts in that the OP that purchased such an intimidating upgrade does not have the build sheet for his JK or just know the gear ratio that his rig is running? I am not trying to be a jerk but, if you're gonna upgrade to this extent, knowing the base specs of your Jeep would seem just a wee bit vital to success....
maybe I need to read on further, as possibly i have misunderstood.........

 

ok...now I have more confidence in the OP's ability and I guess not every JK owner knows their rigs gearing (?) .....this is good stuff!

 

Thanks, I bought this rig used with 6000 miles on it from a second owner. It didn't have a build sheet or even an owners manual, but it was as clean as a whistle and after a test drive I liked the gearing so I bought it for a song compared to what a new one would have cost...One day I'm sure I'll pull the diff covers and count the R&P splines while in there to replace the diff oil.

 

Go to youtube and look this up (the end of my post, its the title of the vid) Its easy and your Jeep isnt rollin just yet. Maybe a quick side project for you.

HOW TO: Find out your Gear Ratio Easy in less than 5 minutes

 

You can also go to Jeep's website under owners section and register the VIN and get the build sheet online in a few minutes.

 

Thanks guys!

 

It would be best to use the youtube method. He bought the Jeep used so who knows if the owner changed the gears or not

 

Wheel spin test = 3.21 which will work nicely at the top end

 

Looking forward to the final install review!

 

I finished the install late so I'll load the new tune/calibration in the morning and do some road testing. Everything went on w/o any major issues except the high flow muffler. It wouldn't fit no matter what I did to it so ill have a muffler shop put my Jeep on a lift so they can modify the muffler so it will fit.