They do. Most old Chevy parts places sell them.Its mostly a couple bearings,seal,and a handful of ball bearings. Theres a place called BuyAutoParts.com that sells rebuilt boxes. I got one for my 55 Chevy 1/2 ton. Nice,and tight.
The Filling station in Oregon shows a rebuld kit with bearings, bushings seals balls and gasket. I'd think that most of the Chevy truck trinket vendors sell somewhat similar kits. The Filling Station: HC-2 - Chevrolet 1955-59 PU STEERING BOX REBUILD KIT Cl***ic parts shows one but you have to reuse the recirculating balls. Steering Box Rebuild Kit-Cl***ic Chevy Truck Parts (cl***icparts.com) I've rebuilt a lot of steering boxes and reusing the balls has never been a problem. Some power steering boxes did come with two sizes of balls that you alternated but I don't think that manual box does.
I'd replace the bushings, and the gaskets, and inspect the rest...if the bearings and balls still look ok, I'd re use them. Check the races carefully, too. The usual cause of slop is the pitman shaft bushing being worn, allowing the pitman shaft to move around sideways.
1. I didn't find rebuilding the stock box to be difficult. 2. If you don't feel comfortable rebuilding it, you can buy a rebuilt steering box. But the last time I looked you needed to send your old box in as a core. 3. You might consider going to power steering, CPP makes a bolt in box and sells the pump, hoses and related items. I did go to power steering, it was one of the best upgrades I have made. However, my 57 pickup is a NAPCO and has a 348 Chevy in it. So my steering was pretty "heavy." Also I gained a much smaller turning radius with the power steering (I used a 1968 Saginaw unit because I had to mount it outboard of the frame for header clearance).
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