Looking to buy a C/K 4x4 and have a question

[NGC414]

I'm planning to look at a 81 4x4 Silverado. The truck is advertised as all original and super clean. The seller told me it was spotless and a 4x4. All he could send was 2 crummy pictures though. So I was planning to take the 2hr trip to see it.
One picture is the interior. Which instantly concerned me. I don't see any 4x4 shifter on the floor. I assume that means the pic is of a 2wd truck. But I'm no expert on these trucks. Do all the 81 trucks have a shifter on the floor? Or was there a different set up maybe?

Posted via Mobile Device