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So, 96 f150 5.0 4r70w 4x4 about 80k miles, transmission shifts through all gears ok, but seems to be a true slush box. Very soft lazy shifting. Also slight stumble or surge in 3rd and OD under light throttle and low rpm(1500-2000), jumps about 2-300 rpm every couple seconds. Feels under powered and slow. I am ready to do the flush and filter but curious as to what else I should do while I have the pan off. I know there is a J-Mod for these transmissions but not sure this would benefit me. Not looking for hard shifting, just something more in line to other trucks I have driven. Heard that the truck valve bodies are different from the car ones, so not sure if the J-Mod will have the same effect or not. Can I benefit from a newer valve body from another 5.0 motor vehicle, ie the Explorer?