Dumb question

I can't find anything on the outside that may differ.
It must be under the hood.

 

Never heard of a 2120...can you show me a link?

 

Just checked kenworth.com, and did a google search, and came up with nothing for both.
Could it be the new nuclear-powered, zero emission truck that has been developed in Area 51?

 

I believe that the 2120 stands for 120" bbc (bumper to back of cab) in other words it has a longer hood. I may be wrong just a guess

 

Someone probably just goofed up when typing in the listing; as far as I can tell (through lots of internet searches), KW doesn't make a model 2120.

 

I thought the 'b' designation referred to the shorthood, also called just 'W900'. Every W9b I have seen photos of has a short hood.

 

The short or "regular" hood is often called a B. The B actually refers to the "b" cab. All W9's, and T-8's are "B"'s. Remember the old W900 A, that was the "A" cab. I suppose we will eventually see the "C" cab as well, although I hope not.