will a 1968 and up chevelle steering box fit a 1966 chevelle ? thanks

Lots of info on this if you do a search for power steering boxes. Also read Jim Shea's Power Steering Pages under Tech References, L/H column box below the Tech Forum box on Title Pg.

I would suggest that you look up the same information at www.corvettefaq.com/A-car.asp (http://www.corvettefaq.com/A-car.asp)

Your Chevelle technical area doesn't have a moderator and hasn't been updated in over a year. I sometimes update my papers and the only place that I can keep them current is to update them at the corvettefaq websight.

The owner of the websight was gracious enough to create the A-car subsection just for you Muscle Car people.

You want this paper:
http://www.corvettefaq.com/acar/A-CarFastRatioGear10JN2002.doc

And there are several excell spreadsheets that list various fast ratio gears that can be interchanged.

thank you , that site has allot of info!!!!!!