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:beer:

honestly i've never seen a set of spyder gears wear out, only fail from overloading. shock loading from spinning one tire on slick surfaces then having it grab, etc. with zero load on the gears i would expect the only type of failure possible to be from overspeed on the bearing surfaces, that...

so now you are talking about feedback from sharp turns. nothing to do with longevity or fuel economy. I can see how lockouts could be beneficial for UJ axles in that condition, but most driving is not at full lock and when it is you will be going slow. seems like a non-issue to me.

spinning the spider gears under no load has much less friction than the ring gear spinning the pinion and the drive shaft up to the transfer case. the scenario portrayed was the latter and will have noticable drag spinning the spider gears which leaves the ring gear, pinion, drive shaft all...

easy, $$$ :)