[tutone]

Several ways to tell. On the front drivers side frame should be a partial vin that matches your tag. Wire brush that area and if it matches, look for frame cuts under the cab or just behind the cab. Most people who cut and weld frames, reinforce with a plate or plates on the inside. Look for bolts instead of rivits on rear cab mounts. If it is all seamless , the bed paint should be the same color and (age) of paint as your cab. You should be able to scrape a hidden spot to find out. It really hasn't been really popular cutting down 4x4s until the last few years. 2x4s awhile now. So if they went to the trouble of doing that, it would have a fresher driveshaft, frame paint maybe (in spots),and then the possibility of a swb swapped frame if the vin and bed dont match. Let us know