Manual shift kit advice

You could also just get a Transgo kit and do it yourself. Keep in mind you may have to change some other parts in your trans as well, if you upgrade the valve body and use a higher line pressure.
Rear band apply piston and spring
Amount of front clutch springs.
Front band apply lever
Front band apply strut.
Be prepared to have the valve body out a few times if you encounter a shift ( gear) overlap problem.
Sometimes it not just as easy as bolting in a new VB