transmission fluid

Discussion in 'General Motoring' started by Bol, Mar 19, 2006.

  1. Bol

    Bol Guest

    Is it possible for engine oil mix with transmission fluid ?
    If so how to check it ?
    The fluid is getting foamy after diving for longer time at higher speeds ,
    and transmission gears are slipping.
    I had the symptoms before , after changing ( last summer ) trans. filter and
    fluid everything was fine for 6 months .

    Plymouth Acclaim 1992 , 3L , 3speed electronic with overdrive.
    Bol, Mar 19, 2006
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  2. Bol

    Richard Guest

    Exactly what fluid are you using?

    Richard, Mar 20, 2006
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  3. Bol

    Steve Guest

    Not unless someone poured engine oil in the transmission.

    However, it IS possible for coolant to mix with the transmission fluid
    if the transmission oil cooler inside the radiator develos a leak.
    Sounds like either an internal air leak, overfilling (allowing the gears
    to whip the fluid to foam), contamination, or very poor transmission
    fluid that doesn't have good anti-foaming additives.

    Since it started after a fluid/filter change, I'd repeat that operation
    making sure that the filter is fully seated on the bottom of the
    transmission valve body to preclude an air leak there. Also, your
    3-speed autimatic doesn't strictly demand ATF+4, but its just about the
    best fluid on the market right now from a longevity point of view
    (oxidation and viscosity stability). I'd use it.

    While the pan's off, inspect for gritty sandy residue which would
    indicate a coolant leak into the transmission oil. When that happens,
    you almost always get the reverse as well, so check the radiator for
    brown gritty scum floating on the coolant.

    Another thought- you might check for a BLOCKED tranny oil cooler.
    Overheating fluid can sometimes foam also.
    Steve, Mar 20, 2006
  4. Bol

    Bill Putney Guest

    Also make sure the right filter is used - on some Chrysler trannies, the
    dealers are known for selling you the wrong filter - they look exactly
    the same - except the nipple is shorter and doesn't mate up with the
    valve body. I was warned about that here, and darn if when I got a
    filter from the dealer a couple of months later, that's exactly what
    happened - fortunately, thanks to the warning here, I noticed the
    problem vefore buttoning it back up.

    Bill Putney
    (To reply by e-mail, replace the last letter of the alphabet in my
    address with the letter 'x')
    Bill Putney, Mar 21, 2006
  5. Bol

    Bol Guest

    Thanks everybody.
    I am going to change the fluid and filter again , that's including flush of
    the transmission.

    Bol, Mar 22, 2006
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