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Unread 02-13-2011   #1 (permalink)
Noahsebb is offline Rookie


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Question 2003 Mustang GT Auto Transmission Problem

I've done some rifling around on the internet and I didn't come up with anything on my particular problem, possibly because I don't know what the correct terms are.
I've had my 03 GT for about six months. I am the second owner. It has 55,000 miles on it and it's been driven very conservatively by my uncle since it was new. I changed the transmission fluid 7,000 miles ago, and I used only Mercon V, as the manual recommends.
I first noticed my transmission problem last week when crossing the highway. I made a complete stop until the road was clear, and when I pressed the gas the RPM's went up without the car moving, and then it caught, lurching forward. It felt like I did a nuetral slam, which I would never do intentionally. Then earlier this morning I got off an exit and made a complete stop. When I pressed the gas, the car bogged down and struggled to move, similar to being in a standard and not giving it enough gas at launch. Within 2 seconds, the car downshifted and continued without any more trouble.

I hope I've given enough details and background information. I was hoping someone here has had a similar problem and could save me the time of taking it to a shop.

Last edited by Noahsebb; 02-13-2011 at 10:12 PM. Reason: Spelling Error!
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Unread 02-14-2011   #2 (permalink)
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At the risk of stating the obvious, have you checked the fluid level? Every symptom mention could be caused by incorrect fluid level (too high or low).

It is important to check the fluid level when the transmission is at full operating temperature. Check with the car on a level surface in park with the motor running. Do not check the level after a long highway trip.

Did you use a new filter?

Next thing to check is the filter seal. If the filter was not installed correctly, air will be sucked in where the filter inserts inside the transmission. This will give the same symptom as "low on fluid".
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Unread 02-16-2011   #3 (permalink)
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I made the grave mistake of allowing my brother to check the fluid level while I followed the instructions in the manual (putting it through each gear with sufficient time for the gear to engage, etc.). He read the dipstick wrong. Figured it out a little while after posting.

I probably should have insisted on doing it myself when he initially pulled out the dipstick for the oil instead of the tranny. Lesson well learned, I guess. Thanks for the reply.
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