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Tranny slipping

Discussion in 'GM Powertrain' started by Quickcobalt1, Feb 21, 2009.

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  1. Quickcobalt1

    Quickcobalt1 New Member

    Hey guys. I have a '91 GMC Sonoma 2wd Extd. cab with the 4.3L 262. The transmission is a automatic but I'm not sure of which one. It has been sitting for awhile and when I got it running yesturday the trans started slipping. It's bad when I go around corners, the rpm's jump and the trans dosen't do anything. Also when it's in park it won't go into reverse right away. It didn't do this before it sat for about a year. Is this something that could be fixed by a transmission service kit from a local auto parts store, or dose this sound like something more serious? The fluid level looks good and the fluid is the right consistency and color. Please help me out on this...thanks for your time.
  2. Z71_guy

    Z71_guy New Member 1000 Posts 100 Posts

    cheap fix try running Trans Tune through it
    just take out a quart of trans fluid and add the quart of trans tune run for 500 miles and change out all fluid and filter
  3. tbplus10

    tbplus10 Super Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    I'd agree with Z71 GUY, sounds like the trans built up sludge and varnish while it was sitting.
    You did check the fluid level right?
  4. Quickcobalt1

    Quickcobalt1 New Member

    Yes, I checked the fluid level and it looks good... both the amount and the color.
  5. 95CTburb19

    95CTburb19 New Member 1000 Posts 100 Posts

    I am a fan of Trans-X. They sell it at autozones and places like that. :great:

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