Drive shaft hoops are a hoop around each u-joint in case you break one and stops from throwing parts everywhere and gutting the bottom of the truck. You should not need to install those until you get to super street or modified street.
You're welcome. Let me know if there is anything else you need to know. I did a bunch of research on it last spring, before I got into doing it. I'm not sure if I'm going to with the new truck yet or not. It is alot of fun though!!!
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