Powerglide. Shorter, look better in v-drives. These are tough enough for dragsters and dirt trackers. only weigh 89 pounds with out convertor. Save park for tuning, etc. 1st gear good for idling around no wake zones. I have never used a cooler. had one in every v-drive. Present one is on its 8th year. My setup is similar to this one. unable to find my pics.