Before rebuilding, I'd go through the adjustment procedures in the maintenance manual. I don't have a link to the Chevy manual, but GMCs used the same steering box. Here is a link to the steering box adjustment page in the GMC Maintenance Manual. The scale mentioned (tool J-544A) can be replaced with a small fish scale. I think I paid about $5 for mine ( 0 to 5 pounds ) at WalMart.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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