R and V have been covered well.
C trucks are 2WD and K are 4WD. However, there are '88-91 C/K trucks as well.
In '73-87, C/K was used for everything: pickups, crewcabs (*), Burbs, Blazers, cab&chassis.
for '88-91, C/K trucks are the new body-style single-cab pickups only; all other body styles are R/V.
I don't pay attention to '92+.
(Someone will jump in here and say that they're really "CK" trucks for 4WD and "CC" for 2WD as that's how the Chevy part numbers work, but that's excessive detail.)
(*) When I say "crew cab" I mean "Crew and Bonus Cabs", for those nitpickers who know the difference.
So, summary: You can have, for example, a 1989 V1500 Blazer which does not use the same e.g. tow hitch as a 1989 K1500 pickup. If you have a 1973-87 truck of any kind, you don't need to worry about it, but if you have 1988-1991 /forums/images/graemlins/k5.gif /forums/images/graemlins/burb.gif /forums/images/graemlins/crewcab.gif (or a cab&chassis which we don't have icons for /forums/images/graemlins/smile.gif), you need to be careful when you ask for parts, that you specify that it's not a /forums/images/graemlins/truck.gif.
Make sense? This is also on my web page about the
History of the 'Blazer' name
(that's a bookmark to the "alphabet soup" section /forums/images/graemlins/smile.gif)
-- A