2003 GT auto shifting

Mithril2

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May 16, 2020
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I have a 2003 mustang gt auto with 108k miles, I installed a fresh crate motor to find my transmission shifting through first and second wonderfully but when it is suppose to shift to third it downshifts to first and I’m wondering if it could be anything other then a bad transmission I did a partial fluid swap which helped a lot but still no luck getting into third gear
 
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