Why are you disappointed with the 5:38's? I have a 3.6 with the Auto and 4:10's and after I install 35's I'm planning on regearing to 5:13's. Please let me know cause you have my curiosity about whether I should go 5:38's instead. I will be taking mine on the Rubicon often so I have to take that into serious consideration. Thanks
BTCS, USN, Retired
2013 Jeep JKU Rubicon 10th Year Anniversary.