GT S197 General Discussion This section is for technical discussions pertaining specifically to the V8 variation of the 2005 and newer Ford Mustang.

4.10's installed!

Old 11-20-2009, 06:22 PM
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^^ I have an auto with 4.10s and it shifts just fine ([email protected]). The gears are super short from 1-3 though, but that's a given with the nature of the gearing.
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Old 11-21-2009, 01:46 AM
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Originally Posted by Silver08Stang View Post
thanks, yes I found a sticker on the dif cover, I have 3.31. another question - I came across an article on mustangs and fast fords about problems they had on a 2006 mustang when they tried to go to 4.10 with an automatic trans, the real problem was a bad alternator that kept the fuel pump from getting sufficient voltage to pump the needed fuel, anyway they talked about having to retune the car so that the shift points in the automatic trans would work properly, there was a tie to the velocity sensors, most likely this is just affecting automatic trans, has anyone with a manual trans who has changed to 4.10's had any issue with velocity sensors and or do I also need to tune a manual trans to tell the computer the car has different gears?
Yes i believe you will need to update the tune. I do not believe it will effect anything other than your speedometer and odometer being off if you do not update the tune.
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Old 11-21-2009, 10:20 PM
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I also have an auto with the 4.10's and have no shifting issues. Like Stealth said, 1 thru 3 are really short, and even driving normally the RPM's get up there quick, so it's shifting sooner. The only tuning you will need is to flash the PCM with the new gear ratio, which you can do yourself if you have an SCT or similar tuner. The shop that installed mine offered a free flash for people without a tuner, but I did my own. Just do it - you will love them !!
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Old 11-22-2009, 09:35 AM
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Question speedometer slow?

hi there,on my 01 gt, has 3.73 gears,the speedometer reads 5mph slow,i don't see a speedcal,would my odometer be reading slow too?it has i think cobra or mach1 white face cluster.i went from point a-b in a jeep that read 1.6 miles,the tires are 1 inch taller than stock,the mustang read 1.7 you think the speedometer was recalibrated,and why is the speedometer reading slow?would the odometer be reading slow?
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