I guess i made the same mistake of buying axle(s) twice. I bought 37s and ran them on my stock rubi44 for about a little less than a year, ended up bending the front stock housing. Bought a PR44 with Prosteer balljoints for my stock internals, regeared to 4.88, went to chromoly axle shafts, Reid knuckles, HD tie rod and draglink, and had the rear trussed.
I ended up breaking the ring gear in the rear about six months after i had them installed, not sure if i stressed them during the wheeling trip the weekend before it failed or the gears weren’t set right and finally failed after a the wheeling trip.
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Six months after that my front passenger side unit bearing failed, thankfully it stayed together as long as it did and the wheel didn’t just fall off.
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In the time that i had installed 37s on my 2013 JKUR with 45k miles (June 21, 2015), i wore out the stock unit bearings and changed them out August 2015 with Timkin unit bearings. In March 2016 i had the PR44 installed and gears done and had new Timkins installed, it was in October 2016 that the ring gear failed, and it was in April 2017 that the front unit bearing failed and i replaced them with some Duralast bearings from Autozone. I felt it was unsafe and unreliable to run 37s on the 44s i had and decided it was time to upgrade. I was originally going to run 37s on the new axles, Dynatrac Hardcore Package PR60/Pro60, and even had the 37s mounted on the new wheels, but then i wheeled with some guys on 40s and couldn’t resist a sale that discount tire had on some 40x13.5x17 trail grapplers.
If you are already thinking 40s just wait on upgrading your axles until you can do it right.
