UPS brought me a nice toy today

You're right, you can't go wrong by going by the book. You won't wear out the bearing any faster by overtorquing though. It's a double ball roller, where the inner sleeves are in contact. You'll see when you put it on, it will spin the same at 50ft.lbs as it does at 250 ft.lbs. Usually when you have a huge discrepancy in torque like that, it's because that is the range of accuracy of the machine that puts it on at the factory. Good to go ahead and get that torque wrench though, you will need that kind of accuracy at that torque range if you have to tighten a pinion nut later on.

Kurt