hi new guy here, hope i"am doing this right. my question is how big of a tire can i put on a 1993 ranger with a 3 inch body life with out it rubbing. thanks

 

Welcome to the site

Bit of a trick question, so no simple answer except stock tire size.

Front wheels are the trick part, because they turn left and right, so while you can put on larger tires because body is now higher up, they can rub frame/parts when turning.
This is is avoided by changing the "offset" of the wheels.

read on offset here: The Ranger Station wheel guide - Everything you need to know!

and here on tire diameters: Ford Ranger / Bronco II Tire Fitment

 

Howdy mate! Post up on Suspension tech section so you'll get more good responses.