Engine, rear gear, Tourque Converter, Tire size info/question for the experts

Use a rpm calc, put in your nfo.. if it says you are supposed to be at like 2700@50mph and you are at 3200.. you have slippage... if you think the TC is an issue send it to FTI.. they are great to deal with (plenty of tc companies though.. so pick one) :)

BTW.. 24.5 " with 3.73s should be 2550rpm... but with that tire diameter i'm betting first gear is gone almost instantly... i run 4.30s with 30" tires and am at 2450@50mph... and i rarely go over 50 due to it (no highway time) it's fun from light to light though...

You need taller tires (28" if you can) or 3.23s.. which would drop you to 1800@50

P.S. i like the 4.30s but they are very annoying... i will probably go to 3.23s when my new motor is done (one day).. and your gearing right now is worse than mine for rpm..

https://purperformance.com/p-29669-rpm-calculator.html