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Hello all. I'm in the market for a 1 ton truck from this generation of Chevys. There's one in particular I found somewhat locally, but I'm a bit confused. It's a 4x4 dually, 7.4ltr engine, auto tranny with under 75k miles on the dash. Upon inquiry, the seller sent me additional photos. One of the photos was a close up of the dash. Now, in my findings, the only transmissions available for the 3500 were the standard 4 speed, and the TH400 automatic. However, on the dash, the gear indicator had the 1, 2 , D, and OD (D with the circle around it). Was there another overdrive transmission offered in the 3500 series that I'm mistaken on? The other OD transmissions of the era were the 700r4 and the 2004r, but I wouldn't think they would put either of those into a heavy hauler dually pickup because those were not rated for that kind of duty. It's also my understanding that the 4l80e was not offered until some year after the 1990 model year. I haven't been able to inspect the truck in person yet so I can't check the pan to tell me for sure what's in there. If it's one of the weaker transmissions, I don't know that I want to waste time driving more than an hour away to look at it, unless my perception of those transmissions is incorrect. Anybody have any idea what I'm missing? Otherwise, I'm in this market because I'm looking for a reliable hauler for occasional work purposes, to trailer my project vehicles, and other general utility purposes. Am I on the right track with pursuing something from this lineup?