Here is some good info on using newer torqueflights:
http://www.transmissioncenter.net/
Performance Automotive Transmission Center
Performance Automotive Transmission Center. High Performance Transmissions, Torque Converters and Parts. Browse our Shop or call 888-877-1008
Here is a good calculator for playing with transmission gearing, final drive ratios and tire sizes:
http://ctny.audiworld.com/mark/s4/gears/gear_calc.html
If you are working with a early dodge truck:
http://www.t137.com/registry/help/decode.php
FlatHead six engine numbers are here:
http://www.t137.com/registry/help/otherengines/otherengines.php
