I have a 88 1500 silverado 350 with auto transmission. I was doing some off roading the other night and got into some mushy ground. I did do some fairly rapid shifting from reverse to drive to rock my way back out of the mud. I drove truck home in drive. When I got in it the next day and put truck into overdrive it won't shift any different than it does in drive. Almost like there is no fourth now. Any ideas on what may have caused me to lose 4th?
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How deep in the mud did you get , did the frame bottom out and get mud up in the drivetrain? Could be electrical or damage in my opinion. Hopefully someone here can help you better with your drivetrain specifics & diagnostics.