97 1 ton GMC 4x4
10

Asked by 1973joe Mar 01, 2018 at 03:48 PM about the 1997 Chevrolet C/K 3500 Cheyenne Crew Cab LB 4WD

Question type: Maintenance & Repair

Won't shift out of 1 St gear. Speedometer
works, full of fluid, even changed filter, also
fluid in transfer case. Please help. I have a
grand in it just this week. Has 4L80 E IN IT

7 Answers
10

1973joe answered 6 years ago

Still same thing. I let off the gas easy, move the shift and nothing. Input, and output speed sensor ?

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10

1973joe answered 6 years ago

Going to pull codes with obd 1 . What should I look for ? Buffer and speed sensors ?

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10

1973joe answered 6 years ago

I just changed trans for same make because it was doing the exact same thing

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10

1973joe answered 6 years ago

New trans same problem. I put my old transfer case on it. There was a bear wire, red that comes out of pig tail for speedo on transfer case, and runs up into the very back of the case. Had all coating worn off. Could thatve messed the speedo up ?

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