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Probably the transmission "valve body". Try a little transmission seal conditioner, such as Trans-X. You might be able to get a little more life from the transmission. If that doesn't work, you'll need to have the transmission rebuilt.

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โˆ™ 2006-03-11 14:57:53
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Q: Your 1991 ford f-150 aod transmission has low and reverse will not shift to any other gears fluid is good what could be wrong?
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