The j-mod is an additional 225$ to have installed along with the trans cooler and a fluid and filter change, and thats WITH me supplying all the parts including the fluid. i thought this was realllyyy pricy but after getting prices back for 400$ from other reputable tranny shops for an install if i supplied the fluid and everything im beggining to think 225$ isnt all that bad. i know the j-mod isnt too difficult i just have no experience working on transmissions and dont wanna start out learning on a 4r70w lol. i am nervous about tranny leaks like what you mentioned in a previos post also, but i just figure EFFF it. lol