1998 F-150 4x4 Strange Problem

Old 06-11-2019, 06:53 PM
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1998 F-150 4x4 Strange Problem

Hello all!
I've got this weird transmission problem on the ol' '98 I own.

First off: 5.4L, 4x4, 4r100w trans

Now, my problem: Whenever I drive over a sharp bump, 3 indicator lights flash for a split second and then go off, and at the same time, the transmission slips (rpm's jump up), but then resumes normal operation. There's been no hint of any problems with the transmission in my truck for the 19 years I've owned the thing, so I'm puzzled.

Also, there are NO codes thrown. Like I said, weird.

Is there something I can check on the transmission? There are no leaks, and no other problems at all, unless I hit a sharp bump in the road.

Thanks for taking the time to read this! Have a great day, all!

Old 06-11-2019, 08:39 PM
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Maybe a loose connection somewhere? Maybe a ground? Check the trans fluid if you haven't already. Check the trans supports (and engine supports) to determine if they are tight and not worn out. Just wild guessing here!
Old 06-11-2019, 09:25 PM
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What 3 indicator lights?

Try to do a video of the cluster when you go over a bump, post it on YouTube, and provide us a link.
Old 06-12-2019, 12:04 AM
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No such thing as a 4R100W. The only 2 transmissions in the 98 were 4R70W and E4OD.

Check your shift linkage and the MLPS. Sounds like it's bumping into neutral then going back into drive.

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