Question about 1993 Chevrolet C/K 3500

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Automatic transmission dropping out of overdrive/4th gear

1993 3500 chevy silverado dually. When I start to drive everything is ok! Going through the gears 1...2...3...O/D ... every thing is smooth no problems, after about 20 minutes of driving the gearbox will not go in to overdrive and there's a real hard shift between 1st and 2nd. When I stop the truck for about 1/2 an hour, everything is o.k again until about 15 - 20 minutes later it starts again. I'm assuming that something is happening when it reaches maximum operating temperature or when the vehicle is put under some load for a while. Have had a technician look at it, he has changed the valve body twice but cannot sourve the problem??

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  • bounty51 Jun 21, 2009

    You are truly a God! (lol) I'll past this information on to my technician. F.Y.I. ( for your Infomation) as a thought on the weekend, something I just thought of (maybe) How does the kickdown work?? could the cable or switch be sticking or malfunctioning?? I notice that I could drive around for 20min or 1 hour and everything is fine but when I put the gearbox under a bit of load, it will change down but won't change up until I've parked the vehicle for a while??

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  • Chevrolet Master
  • 6,982 Answers

Likely you have a shaft seal or clutch piston seal thats leaking only when the unit gets hot and clearances change. It will require teardown and careful inspection to determine exactly where, then replace worn parts and finish rebuild.

Posted on Jun 20, 2009

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