It sound like it is going in to 4low rang but it may only be low 2wheel power brake it a little on dirt if the tires sin in the rear it was only low ranged 2 wheel u can get this by putting it in 4low and unlocking the hubs it may be a hub prob as it is common
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Wiring diagrams for 1980 trucks are contained in a separate Wiring. Diagram Booklet.... Some of these service operations require the use of tools specially designed .... 1-1/2 Ton. 2-3/4 Ton. 3-1 Ton. 4-1/2 Ton (W/HDSusp). Fig. 0A-3-Vehicle Identification Number ... Right Hand Side of Cylinder Block at Rear of Distributor.
It should be the 700 r4 transmission with the 350 block, unless someone changed it out, it could be a turbo 350, if the truck is a 3/4 ton. if you have 3 gears and over drive it is a 700 r4 only 3 gears turbo 350
I have this same problem with my 2001 Chevy Silverado 2500HD. I found a recall on a website that said there were 1,353,718 other trucks with this same problem (no, that's not a typo). Do not ask the people at Chevy to uphold to this recall because I was turned down when I informed them about the problem. Anyway, the explanation for the problem is the wheel speed sensor mounting surface has rust and corrosion (especially in areas who have roads that get salted a lot) on it that moves the actual wheel speed sensor away, creating the thought of an icy condition. If you or a mechanic has the area cleaned, the sensor will go back to its original position, thus fixing the problem.