Care to use a steering box or have an application where a rack & pinion will not work? Look at Unisteer's alternative, brand new GM 525 Manual Steering Boxes.
These boxes have the same GM three bolt mounting pattern as all 65-91 GM Steering Boxes. 525 Steering Boxes have a slower ratio than Vega style steering boxes, making it an ideal choice for those heavier late 30's and 40's cars & trucks with solid axles.

The output spline is 1"-36 spline compatible with Unisteer's straight pitman arm (8030030).
The input spline is 3/4"-30 and is compatible with Unisteer's 8050280 U-Joint.