96 mustang 4.6 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 4 (permalink) Old 05-11-13, 02:32 PM Thread Starter
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96 mustang 4.6

Working on mother in laws car so doing this by description from her.

Doesn't matter what speed but the car seems to downshift at times and the rpm meter seems to jump around. Car won' t maintain speed step on gas doesn't help. But it doesn't last very long then it works fine. Feels like
its shifting down. Had shop inspect trans but all they did was change fluid and filter but no shavings on magnet. Intermittent.


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post #2 of 4 (permalink) Old 05-11-13, 02:43 PM
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Re: 96 mustang 4.6

Assuming check engine not lit, any codes? Possible vacuum leaks?The shifting of the transmission will cause the rpm's to jump around. To exclude the engine, manually shift into a lower gear and see if the engine runs without issue.

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post #3 of 4 (permalink) Old 05-11-13, 05:23 PM Thread Starter
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Re: 96 mustang 4.6

a little more information driving down the hwy at about 65 2k rpm, give a little gas to maintain but rpms jump to 4k jumping around and then it will stop.... she says it doesn't seem or sound like its' increasing speed. It will slow down to 45 or 50 then it will go ok.
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post #4 of 4 (permalink) Old 05-12-13, 09:12 AM
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Re: 96 mustang 4.6

That sounds like a normal function of the transmission downshifting (perhaps she's driving in OD at slow speeds?) or the torque converter locking and un locking. The tachometer would normally indicate varying RPM's. All conditions are normal.
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