Question about 1991 GMC C1500

1 Answer

700r4 transmission won't shift out of low gear and reverse is slipping

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  • j_allen_7514 Apr 03, 2011

    Thank you I just bought this truck knowing it had a problem, it was ran low on fluid and slipping when he put fluid in, it just had low gear and the reverse slip. I noticed the fluid is darker than normal also. He said it ran fine on his way to work, (15 mile) slipped bad on his way home, stopped at store for fluid (6 mile), added then home and parked it. It has a small leak around the pan which is why it got low. (gasket I hope)

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Take it to a shop where they can change the transmission fluid and filter and also have them do a good flush of the transmission with a special solvent they use. If this doesn't help it may be time for a rebuilt transmission.

Posted on Apr 03, 2011

Testimonial: "Thank you, I just bought this truck got a good deal knowing it may need a transmission. Any tricks you can think of please help."

  • j_allen_7514 Apr 03, 2011

    The truck was driven 15 miles to work. Ran fine. On way home it started slipping, stopped added fluid (6 miles) then it wouldn't shift out of low and slipped in reverse. He parked it and hasn't moved since. I drove it to my house 15 miles in low gear. It's leaking a little around the pan (gasket I hope). The fluid is a little dark.

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==========


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-------------

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----------


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http://www.2carpros.com/how_to/transmission_service_4.htm
Popular Problems Checks
1. Car will not go into gear:
  • Gear selector cable has failed
  • Brake lock solenoid has failed not allowing the gear selector to move out of "Park"
  • Excessively low transmission fluid (note: if car is operated for an extended amount of time with low fluid level the transmission will fail prematurely)
  • Shorted electrical component not allowing the PCM to control the transmission. Example: shorted fuse
  • Flex plate (flywheel) is broken completely not transferring engine power to the transmission.
2. Car goes into gear but then fades out of gear or is slipping while driving:
  • Transmission fluid is low
  • Transmission clutch discs or bands are worn out or burned
  • Faulty transmission shift solenoid.
3. Car goes into gear but does not shift out of first:
  • Blown fuse to the PCM controller
  • Faulty vehicle speed sensor (VSS)
  • Shorted second gear control solenoid
  • Faulty transmission controller (PCM)
Tips About Common Problems and Fixes

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