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Old 04-14-2015, 09:40 PM   #1
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2003 Auto Transmission Problem

I'm about to hit 112,000 miles on my auto 03 GT. The car seems to be having troubles shifting from 3rd to 4th. When going from third to fourth it seems like something is knocking underneath the car and it shakes a little. It's like a shudder. It only has this problem when shifting from 3rd to 4th. What could be the problem? What can I do to fix it or is it just gonna go out on me? I heard it might be the torque converter? Please help.

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Old 04-15-2015, 11:51 AM   #2
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It's very difficult to diagnose transmission problems over the internet.
I recommend that you have the problem diagnosed at a reputable transmission shop in your area.
It may be something that can be fixed, or, you may need a rebuild.

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Old 04-15-2015, 12:50 PM   #3
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Have you been keeping up with the maintenance on it? When was the last time the fluid/filter was done to include the converter drain/fill?

Although at this point when symptoms like you are describing appear... probably time for a new trans. Get a new converter while its out. If you do need a new trans, what I would do is find a lower mileage automatic out of a 2004 (2004 only) GT or Mach1. Those were the stronger 4R75w and they are a direct bolt in to all 99-04 cars. Only "gotcha" is that you need to change the OSS sensor pulse count in computer from 6 (4R70w) to 24 (4R75w). Any tuner can do this and a tune is a good thing to get anyway especially with the auto.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.

Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.
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