I’m looking at a new floor mat for my truck. I see there are low hump, 2wd, and high hump, 4WD. My truck is a 78 D100 cab on an 83 4WD chassis. I’m thinking it must be high hump to accommodate the 4WD transmission and that the PO swapped in a high tunnel. Can you tell from the picture if this is the high jump?

 

I would say so, When i replaced the floor pans in mine some of the metal past the pan was rotted. I got what i needed from a Ramcharger in a junk yard.