I have a 1954 Chevy Bel Air with a three speed manual trans and a torque tube rear end set up. My friend gave me a complete rear end setup out of the same year car but it was a 2 speed power glide auto trans car. My question,, is the gear ratio different? im looking for a more freeway friendly gear ratio,,,and question two,,,how hard would it be to swap gears from one axle assembly to the other,,,i have an air bag system welded to my current diff in the car and cant simply just change the whole assembly, can anybody help me on advice on my delima??? thanks!!!!!!!!!!!!!!