This post is primarily for those who are new to the axle upgrade scene...
Food for thought, not for those in the FF is the end-all and can part the red sea camp, but for those looking to upgrade the beef underneath their rigs who are currently on 35s and entertaining the idea of a solid setup for 37/38s while still keeping your stock 3.6 pentastar rig nimble, agile, & low weight, and why a high-pinion axle like a semi-float XD60 should be on your research list for a rear setup....
First nothing wrong with HP standard D60 flare. It's a proven setup with the reverse cut 9.75" R/P. If
can run his cam’d LS3/6L80, 5,750 lb JKUR on Nitto 40s, Dyno’d at 388/396 at the wheels with no issues, guys who are still scootin' around on stock engines shouldn't be concerned.
For a few hundred $ more, you can easily get into the stronger Ford Super 60 with the 10.1" diameter gear. Not only because of the larger ring gear size, but also because of it's much larger pinion tooth contact area which it seems many people tend to overlook.
Why the Super 60? Well if you don't need the beef of a D70 or D80, why not? Keep in mind Ford introduced the Super 60 for their 2004 Super Duty F-450 and F-550 trucks. If you have a 2-door Sahara for example like I do, you are slapping this single axle beef under your ~3760-4100lb rig.
---> Dana Super 60 High Pinion Front Axle - 4-Wheel & Off-Road Magazine
Referred to internally as the "Fat Boy", the Dana Super 60 evolved from the '78-'79 Dana 60 front axle first found under Ford F-250 and F-350 trucks. Keep in mind the original Dana 60 was designed for a 1-ton pickup with a 4,500-pound front gross axle weight rating (GAWR), 29 1/2-inch-tall tires, 4.10 axle gears, and engines that made less than 170 hp.
The Dana Super 60 on the other hand was designed for Ford F-550 trucks with nearly twice the weight capacity, 33-inch tires, 5.38 axle gears, and more than 600 lb-ft of engine torque.
I wanted to confirm those weight capacity and torque capacity specs. Looking at the specs for the Ford Super Duty line-up on Wikipedia, we find the following:
To bridge the gap between the pickup line and the much larger medium-duty F-650/F-750, Ford introduced the F-450 and F-550 variants of the Super Duty; with an available GVWR from 17,950-19,500 lbs, it pushes the Super Duty into the Class 5 truck market. Available only as a chassis cab for commercial upfitters, both versions were fitted with dual rear wheels.
While largely aimed at fleet buyers, F-450 and F-550 were configurable in XL, XLT, and Lariat trim levels available to Super Duty pickup buyers. The sole gasoline engine was the 6.8L V10 while the 7.3L PowerStroke was the diesel option; in 2003, this was replaced by the 6.0L PowerStroke.
In 2005, the F-450 and F-550 received further updates to the exterior than the rest of the Super Duty line, with an extended front bumper and front fenders; the F-550 received a "wide-track" front axle to sharpen its turning radius.
So not only was the Super 60 in it's high pinion reverse-cut FF as front axle configuration rated for ~7000lb-8000lb GAWR, the 6.0L PowerStroke turbocharged engine they were found under was pushing 560-570 ft-lb of torque.
With an Edelbrock supercharger out of the box setup, you are only getting 262-277 rear wheel torque...
The Edelbrock E-Force Supercharger system part # 1527 for your 2012-14 Jeep Wrangler delivers 317rwhp and 277rwtq for a MANUAL and 303rwhp and 262rwtq for an AUTO. This Supercharger is exclusively for the Pentastar 3.6L V6 Engine
Conclusion: Just in weight capacity and torque capacity alone, jumping to a Super 60 is a no brainer.