2012 stock JKU Sahara Regeared From 3:21 to 4:1 - advise?
I purchased a used 2012 JKU Sahara, automatic with factory tow package, The dealership advertised it as having the factory max tow package (comes with 3.73 gears). Turns out my JKU only had 3.21. Per Jeep in order to reach the max tow of 3500 lbs I would need to swap the 3.21s out. The dealership agreed to pay for regearing at a reputable local shop. At the suggestion of the shop I had 4.1s installed on my stock JKU Sahara. After installation it threw out an error code - the shop said I could have the computer flashed to accept the new gears or install a tuner (opted for tuner).
The jeep drives fine for the most part - rpms are much higher (avg just over 2000 "cruising", sometimes hitting 3000 before shifting to the next gear - 4000 when towing). There seems to be excessive heat coming from under the jeep after driving around (not just when towing)- but we've also been experiencing outside temps in the mid 90's so that could be the issue with that.
I've been looking for guidance online but the more I learn, the less I know ;-p My questions are these: Can a stock 2012 JKU Sahara handle 4.1s without further modification (tfr case, axles, etc.)? Now that I have 4.1s what are the first changes should I look into making (tire size etc.)? Should I be concerned about the high rpm's or "it is what it is"?
Relevant stock specs for 2012 JKU Sahara:
5-Speed Auto W5A580 Transmission
Command-Trac Shift-on-the-Fly 4WD
Next Gen. Dana 30 Solid Front Axle
3.21 Rear Axle Ratio
Next Gen. Dana 44 HD Rear Axle
Conventional Differential Frt Axle
Conventional Differential Rear Axle
3.6L V6 24V VVT Engine
P255/70R18 OWL On/Off Road Tires
Transferase is 2.72-to-1 reduction I believe
Thanks in advance :-)