Maddoggee1959,
I don't think with the driveline combination with your freshly built 383 stroker will give the engine what it needs to reach it's full potential. What cam and heads are you running on the 383 stroker? I built a 383 stroker with a split duration Crane street/strip cam and reworked heads from Indy Head Service for my previously owned 1958 Chevrolet Biscayne 2 door post. The heads were designed to run with my cam specs. I ran the stock Muncie 3 speed with 3.55 posi rear end gears. The rear gear ratio was GREAT, but the stock 3 speed did not let the 383 reach it's full rev potential. I ended up rebuilding the 3 Muncie 3 speed with a "hotrod" kit from Driveline.com. The "hotrod" kit gearing gave first and second gear the correct ratio so that the 383 could reach it full power potential. If it were me I would look into a 4,5 or 6 speed transmission so that you can use 1st and second gear. The SM420 1st gear is a "granny gear" for low RPM and torque only. 2nd gear is what most people use to start from a stop on the street. The 3.90 gear is too high for highway driving. I would go with 3.72 or 3.55 if you want to cruise at 65-70 MPH. Just suggesting.
Tim
Last edited by fixit1958; 01/11/2016 4:35 PM.
