2003 Mustang GT Auto Transmission Problem - Ford Mustang Forum

LinkBack Thread Tools
post #1 of 3 (permalink) Old 02-13-2011 Thread Starter
Noahsebb's Avatar
Joined: Feb 2011
Location: Parkersburg
Posts: 2
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!
Noahsebb is offline  
Sponsored Links
post #2 of 3 (permalink) Old 02-14-2011
SHELBY GT 350 Member
wmburns's Avatar
Joined: Sep 2010
Location: Houston
Posts: 6,288
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".

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
wmburns is offline  
post #3 of 3 (permalink) Old 02-16-2011 Thread Starter
Noahsebb's Avatar
Joined: Feb 2011
Location: Parkersburg
Posts: 2
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.
Noahsebb is offline  
Sponsored Links

4.6 , automatic gt , technical question

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome