Model question

 This is probably a dumb question, but I can't seem to find an answer anywhere.     How do I know what model my truck is?  C-something, K-something, 1500, 2500, 3500?  It's an '85 Silverado dually with a crew cab and a long bed, 454 engine and 4-speed (with granny gear) tranny, if that's significant.  It just says "Silverado" and "3+3" on the truck.  If anyone can answer this question for me, I'd appreciate it.  Thanks! 

If I remember right, the C is for two wheel drive and K stands for four wheel drive.

dulie means it is at least a c3500 1 ton if two wheel drive or k3500 if 4x4 .

In 1985 the Chevy trucks used 10 (1/2 ton), 20 (3/4 ton) and 30 (1-ton) series badging.

So a 1985 1-Ton Dually would be a C30 if 2WD or a K30 if 4X4.

The 1500, 2500 and 3500 designator was introduced in 1988.

exatly right there ZX1100F1

what zx1100 said is right, but i wonder if the 3+3 is something that was put on????

I've seen the 3+3 logo's before, from the factory.  I "think" that they refer to the seating or number of passengers that you can carry.  The "crew" cab is the 4-door, so it's 3 up front and 3 in the back.  Not sure of this, just my WAG.
 
Also, back then, Silverado was a trim level, as opposed to a model ID.

i agree with hydengr on the 3+3 badging... my dad has a 1987 crew cab 1 ton and it also says 3+3...

Righto, the 3+3 badging is on factory installed crew cabs signifying seating for 3 in the front and 3 in the rear.

i see