A body Steering Boxes

RustyRatRod said
Did all A bodies use the small sector shaft? If not, when was the change to the large shaft? Thanks.

All A-body manual boxes used the small sector shaft, no change was made. Actually goes for A, B, and E body manual boxes.

Trucks, vans, and some C-bodies came with a large sector manual box.

Looks like the tech page is back up over at BigBlockDart here Steering Box Info

But here's the relevant commentary from the BigBlockDart tech page...

All steering boxes will physically bolt to all K-frames. The physical length of the boxes only differ between manual and power, therefore, steering columns only have two lengths - one for manual and one for power. Although you'll probably get a new one, the coupler block between column and box is specific for manual or power.
The compatibility problems with different boxes largely boils down to output shaft, or sector shaft size. First, there are two sector sizes, simply known as large or small sector. The large sector, just above the splines as it exits the housing, measures 1.22". The small sector measures 1.11".
62-76 A-bodies, 62-72 B-bodies, and 70-74 E-bodies all used the same manual box. Most of these boxes used bushings throughout, however, the B-body V-8 units were built for more abuse and used bearings internally instead of the bushings. All manual boxes used a small sector shaft with the exception of C-bodies and vans to 1988. The big cars and vans used a large sector, presumably for added strength. It's also assumed these boxes used bearings instead of bushings.