and robbins limit your power displays to first and second gear---3rd and 4th are somewhat weak due to being reversed in order on the mainshaft----passon sells a hemi cut gearset for the 833od that is good to 750hp---one of my friends runs one at the dragstrip in a blown stroker 440 with no problems in 5 years---loves it as he can drive on the highway at fairly normal rpms.....