I got the 4R70W on a 01 F150 Supercrew 4x4 5.4l engine. I really would like to get a shift kit before doing anymore mods first. However, getting into the transmission is not my cup of tea. Never messed with them and I wouldn't be comfortable. 300 bucks would be money well spent in my book just don't know anyone around here that would do it that I'd trust.