Thanks for the information. I don't know if my original box is 3.1 or 4.1. If that's a ratio I don't see a close reference. I can say the steering box I have was discontinued in 1984.
Nobody in the area rebuilds these. Redhead will rebuild it for $300 plus a $150 core charge. Add shipping both ways it's over $400. So heck with it, I'm buying new or re-manufactured. So I'm looking at:
Upgrade: This might be the 500 Dave spoke of:
https://www.summitracing.com/parts/c.../submodel/base
Re-manufactured:
https://www.summitracing.com/parts/a.../submodel/base
https://www.summitracing.com/parts/a.../submodel/base
Another option:
http://www.powersteering.com/
On a side, Redhead will send a replacement, but costs the same. I guess they figure their rebuilds are better than Cardone's and ACDelco's
I thought the cost would be more regardless. When I first bought my truck in 89 I was quoted $500 for just the box. So I let it leak over the next 25 years or so, and yeah, it was a little sloppy.