If I got a O.S. CV-RX .15 would I have to get metal cvds? (and if so i'd go with the pro-line kit that includs them) or could I get the engine with out worring about the drive shafts?
It won't be necessary to get CVDs with the .15 CVR-X. The CVDs are expensive, and they will add 9.1 ounces to your truck. I would suggest running your stock slider until they wear out. Then you can get a set of 2.5 sliders on eBay for around $30.