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Old 05-26-2015, 03:17 AM
CoosaGuy CoosaGuy is offline
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Join Date: Oct 2014
Posts: 10
Default 2003 4.0 automatic transmission slipping at high RPM

Transmission on my 2003 FX4 level 2 is slipping into neutral at RPMs above 3500. When I drive below that it's fine other than it slips into neutral when I'm coasting around 30 to 40 mph. When it does this it takes around 2 to 3 seconds before it shifts back into gear. It's not low fluid or old dirty fluid, the filter was changed 4000 miles ago, I read on a forum about a PCM reflash on newer models around 2008 that were doing something similar. Anyone know if the 2003's need this done?
2003 Ranger FX4 Level II / 4.0 / Automatic Trans
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Old 05-26-2015, 08:54 PM
Tyler46 Tyler46 is offline
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Join Date: Nov 2014
Posts: 7,013

My friends Sport Trac did the exact same thing. We were coming home from camping and her truck wouldn't engage into reverse. She was burning up the fluid and doing what you described. Hers was much worse though.

It was giving the following codes:
-Incorrect gear 3 ratio
-incorrect gear 4 ratio
-incorrect gear 5 ratio

As well as a couple others.

She drove to work for the next few weeks in 2, not OD (damn women) and I told her she could reset the computer and flush the tranny fluid, maybe the gears will engage properly. So we unhooked the battery and let it sit overnight, still did it. After about a week she tried again in Drive and her truck drives perfectly.

I really though she had broken internal pieces but I guess not. Try scanning for any trouble codes.
2007 Regular Cab - 2.3 DOHC - 5 Speed Auto - 4.10 Gears - Maxtrac 7" Lift - Fiberwerx 3" Fenders - Bilstein 5100 Series - 15x10 Ultra 164's - 35x12.50x15 Red Letters - Custom dents

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4.0 liter, automatic, fx4, transmission

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