Century Transmission builds us a Powerglide good for 2,800 hp. HOT ROD Staff Writer May 31, 2011. ... Although the venerable GM Powerglide has only two forward speeds inside its case, ...

If you do change over to an aluminum case, select one of the same length as the iron transmission that gets trashed. The '55-'57 cast-iron units were long transmissions, as are the '65 and later ...

Powerglide Versus TH400. ... This is a great option for well-informed racers that involves selecting specific components, such as transmission case, pump, drum, planetary, ...

In gearboxes for example the Powerglide is RPO 313, and for 1962 there’s a new RPO 685 four-speed box that’s sold only with the two milder hydraulic-lifter engines. Its ratios are 1.00, 1.51 ...