steering gear box

Original-equipment steering gearbox interchange is '62-'72 A- and B-body. There is no split at '67 or '66 or '63 or any other year within that range. Of course you have to use the correct pitman arm for the car you're working on: '62-'66 A-body, '67 A-body, or '68-'72 A-body. The nonpower boxes originally installed on 6-cylinder cars have sleeve bushings; V8 boxes have roller bearings.

I put a 16:1 box in my '65 and hated it. Even with a lightweight aluminum-block 225 engine and a careful alignment, it drained most of the fun out of driving the car: too twitchy on the highway, too hard to steer around town (especially when parking!). I wouldn't do it again. I put a 20:1 box in my '62 and absolutely love it: perfect under all conditions; the way the factory should've done it.