Beater I honestly don't know what the "336" repersents except that it is part of the forumla that does not change. I also know that this assumes no tire growth or slippage ( think top fuel drag slicks when doing a burnout how much the tires slip and grow) and a solidly connected drive train i.e. a stick shift or lockup converter. Every car or truck I have tested works perfect with what the formula says. Non-lock up automatics with a stock converter add ~200 RPM at 60 mph. For first gear speeds just multiply the trans gear ratio with the axle ratio. In my case 2.52 X 2.73= 6.8796. I am told that to run good that number needs to be close to 9.0. That is why I asked what would happen if I put in a th200 trans with it's 2.74 first gear. Would it be worth doing? Jay 6155
