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No 3rd gear

This is a discussion on No 3rd gear within the GM Trucks forums, part of the Vehicle Specific category; Well, my transmission is giving up. I've got an '89 GMC 1500 with 120K miles on it. I noticed Sat ...

  1. #1
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    No 3rd gear

    Well, my transmission is giving up. I've got an '89 GMC 1500 with 120K miles on it. I noticed Sat that 3rd gear was slipping real bad. So Sunday I changed the fluid and it was brown instead of red. I'm assuming the clutches on 3rd are ate up.

    Don't know if I want to rebuild or replace the trans. Or just get rid of the truck and get a new one. Not sure I can afford a new one right now.

  2. #2
    Member NaviDyn's Avatar
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    2002 GMC Yukon

    3rd is direct drive, where the unit is moving together. Sort of like a manual where the input and output shafter are locked together.

    Could be the clutches. You can't really know without taking it apart, or having the clutch application chart. I don't have that in front of me. With the forward and direct applied together, the unit is in direct, and it rotates as an assembly. Also know I am generalizing about 4 speed rwd automatic transmissions. In general, they work mostly the same wether it is the hydramatic, Aisin-Worner, Ford, or whomever.
    Last edited by NaviDyn; 03-19-2010 at 11:34 PM.

  3. #3
    Member blackcar's Avatar
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    2000 Camaro SS
    '02 Z28 parting-out

    It was the clutch pack. Got it rebuilt for $1300

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