speedo problems after putting a 3.90:1 diff in an ef falcon - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
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post #1 of 2 (permalink) Old 05-28-09, 02:35 AM Thread Starter
EF falcon
 
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Join Date: Jul 2008
Location: Adelaide
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speedo problems after putting a 3.90:1 diff in an ef falcon

hello can any one help me, i have an ef falcon which i have installed a 3.90:1 diff in replace of the standard 3.25:1. my speedo is now not correct. where can i buy a 3.90:1 speed sensor for a t5 gear box?

If i cant buy one any one know how to modify the old one or fool the ecu to get correct speed readings

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post #2 of 2 (permalink) Old 05-28-09, 04:10 PM
Bronco Guru
 
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Join Date: Sep 2008
Location: Memphis, TN, USA 38135
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Re: speedo problems after putting a 3.90:1 diff in an ef falcon

You don't change the sensor - just the plastic gear on it. There are many websites with gear calculators, so do some searching. This one is for CrownVics, but it might work for you:
Speedo Gear Selection

Also...
It took me a few seconds to figure out that you were talking about a modern car. Falcons haven't been made in the US for some time, so it would help if you add your car's specs to your signature &/or profile.
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