Chevy 700-R4/4L60/4L60E Transmission Heavy Duty Reaction Sun Gear Shell known as The BEAST Repair Kit This Repair Kit Includes: * The BEAST Sun Shell * All gaskets and seals necessary to install these parts * Teflon coated front pump bushing * New thrust washer kit with selective's to adjust transmission end play The original reaction sun gear shell is a major weak spot in the 700-R4 and 4L60E transmissions due to the splines being worn down or completely stripped out and we highly recommend you update it! The BEAST is an updated heavy duty reaction sun gear shell that is designed to be stronger than the original shell.