'55.2-60 GMC Master Parts Book does show the spring (16.0630 in picture below). It should be the same on your Chevy 3100. Spring is described as "Spring, Steering Shaft Bearing, 3/4 ID" and is the same part number (264832) for all 55.2 thru 59 trucks 2.5 ton and smaller.
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Last edited by Bill Hanlon; 03/15/2023 3:18 PM.
'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.