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97' F150 transmission question

Old 03-22-2019, 12:41 PM
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Default 97' F150 transmission question

Hi all. Question for you. In 2004 I bought a 1997 F150 4.2L v6 with 157,000 miles. 15 years later she now has well over 350,000 miles and runs like a champ. However, she has suddenly started slipping a little. I was raised under the old school thought that if you don't know what has been done with the tranny by the previous owner and it's running fine, don't touch it. In other words, if it ain't broke, don't fix it. Sooo, she still has the same fluid, filter, and pan seal that she had when I bought her 15 years ago. I checked her fluids every two weeks, transmission was always full and color was prefect. No leaks no nothing.

What do I do now? Do I a.) Drop the pan, replace fluid, filter, and seal and add some slip stop? b.) Do nothing at all? Or c.) Remove some of the fluid and replace with fresh fluid and slip stop?

Like I said, I have always kept up with routine maintenance, hence her getting to 350k, but her tranny fluid was always full and clean so never touched it. Advice??
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Old 03-25-2019, 07:28 PM
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Do letter A, might help, might not,, but it won't hurt anything.
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