[68c10airstream]

Hi roger, in my 68 c10 i installed a factory c10 box from a 1985 chevy. 3 1/2 turns lock to lock and the best part is variable ratio, so this means the box reacts nicer and a little slower in the center area (about 17 to 1 ratio) and then firms up and reacts about 13 to 1 for the rest of the turn. My schooling in the 70's was that the corvettes with a very quick box were twitchy and over-react at high speed so gm designed the variable ratio in about 73-75. This is my favorite box as it's the best of both worlds. Look in the glove box lid as the build sheet will id it as such. If you doubt the feel drive a late model gm truck from about 1975 to 1995 and see what you think. 1996 went to an easy steer with too much assist and doesn't feel right, too light and easy. Newer boxes use different lines so get the junkyard lines and the fitting in the back of the pump also and install and enjoy. Good luck, Brian F.