I have a 1993 W350 dually and I want to be able to start making some more power with it, but it has the a518 so I need to fix that weak link before I do anything serious, as I'm sure you all know. My first choice would be an NV4500 but that's 2500-3000 for parts from the junkyard, so I can't really afford that considering I am 16 and make $8.50 an hour and play football so I don't have much time or money. What would you all reccomend? Would a 47re swap be cheaper? What about building the 518? I'm not looking at making a 600hp 1500ft/lb truck, I would be happy with 300/700 or something along those lines. I would be able to spend about $1000 on the tranny, but could save up some more if it is $1500 or something like that. Anyone got any suggestions??