Well any big engine other that stock will melt the plastic gear and metal tranny gears have to be with the hardened CB gear or they will get eaten up. I have seen stock savage x chew up the plastic gear alot. On my truck I have the hardened cb and the metal tranny gear which I have spent alot of...
Well as far as I know they are the same but id buy the one listed for your engine. Ill bet the part numbers are the same but they are listed seperate so people who bought the savage x know right what to look for.