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  1. #1
    Master Mechanic rustyk2's Avatar
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    Default Transmission Help.....Please?

    Hey guys, big problem here. My 1988 Burban 350 with th400 tranny is having issues. I am losing fluid from the fill tube, I know the grommet is loose but is only part of the problem. The real issue is that fluid is being pushed out the fill tube. I add a quart. drive 5 miles lose a qt. When its low, wont shift properly but that I understand. Question: Could the vent tube be plugged and would that cause this problem? Or is there somewhere else I should look?
    Please Help
    Dana
    Dana South Carolina

    1986 V20 Suburban
    1988 V20 Suburban
    1995 Camaro convertable
    2003 Trailblazer LT
    :sign0196::wink2:

  2. #2

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    Quote Originally Posted by rustyk2 View Post
    Hey guys, big problem here. My 1988 Burban 350 with th400 tranny is having issues. I am losing fluid from the fill tube, I know the grommet is loose but is only part of the problem. The real issue is that fluid is being pushed out the fill tube. I add a quart. drive 5 miles lose a qt. When its low, wont shift properly but that I understand. Question: Could the vent tube be plugged and would that cause this problem? Or is there somewhere else I should look?
    Please Help
    Dana

    Vent tube is plugged if you are pumping fluid out the dipstick. The filler tube sits below the level of the fluid, and any pressure in the case will push the fluid up the tube.

  3. #3

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    Locate the vent tube. It's on the back of the case. See if it's got mud or something on it. Next blow some air into the vent hose to clear it. If it still vents fluid out the dipstick you have an internal leak causing the venting. The trans will have to come out.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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