Ok, I am having some power loss with my 33s, but I have a friend that has a manual tranny in his 2001 f150 with 37"boggers and he has 3.55 gears and a 4.6 liter v8, that is experiencing not a lot of power loss. I think my main problem is that I have an automatic tranny. I noticed that SQUANTO has a "TransGo Shift Improver Kit" . I was wondering if this would help my gears shift easier and at lower RPM. Right now when I travel the interstate and go up big hills at 70, i stay at 4,000 RPM and I know this couldn't be good for my truck. I am planning to add 4.56 gears and 36s for the future, but I am hoping that this kit would help my problem now and prvent it from the future. So basically all I want to do is have my gears shift at 3,000 RPM each time, so I don't stay on the red limiter. If ANYONE knows about this TransGo Shift Improver Kit please let me know! THANKS.