We don't recommend running 37-inch tires on a stock Dana 44 front axle, especially in rockcrawling applications. As such, we upgraded our donor Jeep's front axle with 4.88:1 gearing from Yukon Gear, a pair of chromoly inner axleshafts from Alloy USA, along with 300M replacement U-joints from Longfield Super Axles. These axles are much stronger than stock, and the new Longfield joints come with a lifetime guarantee against breakage. We like them because they're less expensive than other high-strength U-joints on the market while still maintaining superior strength. The Alloy USA shaft upgrade comes with Spicer 5-760x U-joints, but we felt the Longfield joints were a better choice for this application. It's true this upgrade would theoretically move the weak link to the ring gear, but for now we want to see how well all these upgrades live before taking the next step: cryogenically treating the ring-and-pinion (we'll delve into that some time down the road). The good folks at Right Gear and Axle of Salinas, California, did the gear and axle swap for us in a short afternoon visit.