trans swap; mustang to thunderbird - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 2 (permalink) Old 01-15-13, 01:41 PM Thread Starter
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trans swap; mustang to thunderbird

i swapped a 4 speed metric overdrive transmission from a 94 mustang to a 94 thunderbird. everything work fine except for the od light flashes all the time and the speedometer reads about ten percent high.

Anybody have any helpful feedback that might help me correct these issues?

thanks, dave

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post #2 of 2 (permalink) Old 01-15-13, 04:52 PM
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Re: trans swap; mustang to thunderbird

You have a different gear ratio in the rear end, you have to match the speedometer gear to the rear end/tire combo.
Speedometer Gear Calculator

As far as the OD flashing, after the day I had, I have to ask this question: does the tranny have an overdrive.

Usually a flashing OD light indicates transmission problems. Check level and make sure all wiring got connected correctly. Did you see the tranny run in the 'Stang?

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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