07 GT transmission - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 4 Weeks Ago Thread Starter
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Joined: Aug 2019
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07 GT transmission

My automatic transmission went out in D and R. 1-3 still worked. Having it rebuilt. Shop said it was completely done. 137k miles. Had some erratic shifts and clunking when shifting from reverse to drive over the years. I bought it new in 07 and have dogged it every day. In January I put on a CAI, XTC tuner and new exhaust. Otherwise it’s stock. I’m concerned the tune might have caused problems or finished it off. Any thoughts on if I should keep the tune on or remove it? Heard anything about this being a problem or did I just wear it out with my driving style? Thanks.

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post #2 of 3 (permalink) Old 4 Weeks Ago
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IMHO, tunes (real-not mail order) are fine as long as they do modify the tranny programming......


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post #3 of 3 (permalink) Old 4 Weeks Ago
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Probably your driving style, if it is anywhere like mines. I had some issues with my 2007 also. Had it rebuilt several times after 140,000 miles. Ford also had a TSB issued on that trans.
Ford TSB Article # 09-12-12


Issue
Some 2005-2009 Mustangs equipped with a 5R55S automatic transmission may experience shifting concerns. A loss of 2nd, 3rd, and 5th gear - may have overdrive band or intermediate band failures due to servo pin case bore wear, causing reduced apply pressure.


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