Automatic transmissions are now used in most street machines, street rods, off-road vehicles, and drag race cars. With the addition of recalibration kits and new forward and reversed valve bodies, ...

For the price of the trans pan, valve body, and separator plate gaskets, the firmness and quickness of GM Turbo 400 upshifts and downshifts can be dramatically improved, according to Darrell Young's ...