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Since you mentioned that your fluid is yellow, that would mean that there is water in there. Not a good thing at all! The only place that water could easily enter the tranny is from the cooler which is part of the radiator.

Does the car run at normal temp?
Have you check the coolant res and see if there are signs of tranny fluid floating on the surface?

  That's definitely not it.  No tranny fluid, or anything oily in the coolant.  As an experiment, I separately mixed a small amount of coolant with a larger amount of tranny fluid (more normal-looking tranny fluid from a bottle of unknown vintage that I found in my trunk), and what I got did not look anything at all like what was in my transmission.

  I did decide that the fluid probably needed to be changed, so off to Wal-Mart I went to get a gallon of fresh tranny fluid, which is now in my transmission in place of what was there before.  The old fluid seems to have the right consistency, and general level of darkness (perhaps just a bit darker than the new fluid), but the color is quite odd.  It's sort of a brownish/yellowish color.

  It's difficult to tell for sure, but the transmission seems to be working somewhat better now, and improving as I drive it (I don't know if it's really working better,or whether I'm just getting better at manipulating the throttle to cause the transmission to shift closer to when it should), but it's stll definitely not quite right.  I think I'll give it a few days, on the theory that the new fluid needs to works its way in, and displace old fluid and to lubricate and loosen things that have become ??sticky?.

Hyster E60XM-33 1996 Mercury Mystique GS, Zetec, ATX To email me, remove the string HatesSpam from this address:BobHatesSpam@Blaylock.to