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  1. #1

    Default 700r transmission

    I got in my truck last night to go to work and backed out of the driveway. Pulled it down in drive and took off, but the transmission never would leave 1st gear. If it had been my 76, I would have checked the vacuum hose and all would be good, but I need to know what happened here and what to check. The thing pulls great, but just won't shift and has never given any hint of a problem till last night. HELP!!

  2. #2

    dwill3015's Avatar
    Join Date
    Jan 2007
    Yacolt, Washington
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    Welcome to the site! That does not sound good. Same thing happened on our suburban and we had to replace the tranny.
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  3. #3


    Check the transmission fluid level. Low tranny fluid will cause you to lose gears because it can't build up the needed pressure to shift.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

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  4. #4

    Default Fixed it!

    Thanks for the advice, but it ended up being trash in the valve body causing the check balls to freak out. I changed the fluid and put some additive in with it to flush out all the trash. Had to drive it about 20 miles to get it just right , but she works like a charm now. THANKS

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