I just installed a set of vette servos, easy easy easy. everybody says the cap is tough to depress, but mine had no trouble. almost lost the e-clip though, but i have a big box of little stuff, including about a million diff e-clips. the truck shifts great from 1-2 and from 2-3, after that, eh nothing spectacular. gonna look into a 4th servo. overall, $11.50 for the servos and 15mins labor, good slams and better et's. if you haven't done this, do it, cheap, and so worth it.