why is everyone dissing the zf5? you think an nv4500 is better? zf5s are considered one of the strongest manual trannys out there. You can put down a lot of power before you have to tear into one, you just need a good clutch obviously, just like with any other manual you look at. nv4500s are sloppy, have 5th gear nut issues, and dont have as good of gearing as the zf5s. unless you go medium duty, zf5 is your best bet, especially since you already have one.