The axles and the carrier are both weak, and so is the housing and axle tubes they bend easily. You can upgrade the axles, carrier, and put a truss on it then at that point the gears are a weak link and there is no upgrade there other than swapping to a different axle. A factory Ford 8.8, Chrysler 8.25 or Dana 44 are all stronger than a fully upgraded Dana 35 which is why I never reccomend spending any money upgrading Dana 35 when you can just swap to a much better axle. As for the IFS Dana 35 in the Rangers it doesnt really have those issues, since the housing and tubes aren't supporting the weight of the vehicle like a straight axle, it is in the front instead of the rear, and it is an entirely different design other than the differential and gears. Most of the time on a Ranger you will break a CV, U joint, or hub before an axle shaft of something in the differential.