I have pulled several times at our local fair with good success with my old 01 550 hp truck. I have bought another truck that should b in the 800 hp range. I pulled in 4 lo 3rd gear before, Should I pull in 4 lo 4th gear with the hp I have now? We can't have hanging weight street legal trucks. Any other mods I should do? Any input would be great as I Know very little about pulling.