Re: 4wd spicer hub color
1960-67 K10 is not in scope for this discussion. Focus here is 1968 and newer. From what I have researched is either hub was available from GM. Hub knob color transition is still up in the air. SOME 1970 K/5-K/10's had red. Many came with the blue, such as my 3/70 built Blazer.
K20 hub usage is very clear. 1970 was the initial year of the external Spicer locking hubs with red plastic knob with no Spicer lettering. SOME early 1971 K20's had the red, then transition to blue with Spicer lettering.
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress... 
1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 
2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...
2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels
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