I'm of the opinion that you don't usually need alloy shafts for an open Dana 35 with 33" tires so long as the trails aren't that tough and you know how to not abuse an axle.. But when you add a rear locker, you do need alloy axle shafts in a Dana 35. Adding a locker can easily double the stress/torque a single axle shaft sees which can snap a Dana 35 shaft.
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