C10 or K10

I've owned three chevy's all being 4wheel drive, a 1979 K5, 1986 C10 and a 1985 C10. What does the K and the C stand for?
When I purchase parts for my latest (85, C10 as on the fender emblem) I'm told it's a K10 because it's a 4wheel drive.

 

K and V ('87-91) series are 4wd, C and R series are 2wd. Fullsize Blazers are called K5s but are actually titled as K10s (or C10 for the rare 2wd models). I'm not sure the letters mean anything and are just to designate 2wd from 4wd models in the VIN.

 

C = 1/2 ton K = 3/4 ton .

 

C-10 is 2wd 1/2 ton, K-10 is 4x4 1/2 ton. C-20 is 3/4 ton 2wd, K-20 is 3/4 ton 4x4. Hope this helps.

 

ok then here some more C-15 2wd 1/2 ton K-10 4x4 1/2 ton
C-25 3/4 ton 2wd K-25 3/4 ton 4x4.
Now around 1980 or 1981 I beleave there was no more K-10 optionbut it's been a long time now. Good job 62 short step thanks.
now from 1973-87 10-Chevy 15-GMC
20-Chevy 25-GMC

 

Chevy continued using the C/K-10/20/30 until '86, then the old body style became the R/V series until they stopped producing them in '91. They didn't change the numbers to 1500/2500/3500 until '89 or so. I've only seen GMC's use the 15/25/35 and 1500/2500/3500 before then.