Dan:
My '39-53 GMC Master Parts Book (it's a .PDF file) shows the 607306 steering knuckle with a casting number of 3664551 used on '41 thru '50 half ton and '41 only 3/4 and 1 ton GMC trucks.
Mysteriously, that 3708866 part number is penciled in on the line with the 607306 part.
My '47-'54 GMC Master Parts Book (also a .PDF) has the 3708866 part number listed as replacing the 607306 part number on the same '41 thru '50 half ton and '41 only 3/4 and 1 ton GMC trucks.
The GMC books do not list the 605141.
'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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