Question about Gears

Ridinlow6969 · October 8th, 2007, 04:46 PM

now i know there are a lot of post about rear end gears but i could not find some answers i was looking for and hope that someone can help me out. Im looking to install a set of 3.73's in my 05 v6 mustang, its an auto by the way. And I was wondering if you have to tune the ecu with a after market programmer, or if the gears can be installed without a tune. I know i hear that it will mess with my speedometer but will it have any other bad affects? i read somewheres that a guy was having trouble with his transmission when in overdrive because he didnt tune the ecu for the new gears. The reason im asking this is because the dealers in my area are telling me that they will void my warranty if they see any sign of a programmers chip being used. if anyone has a set of aftermarket gears on without a ecu tune let me know how everything is going, thanx.

TheUNZippee! · October 8th, 2007, 04:51 PM

You do not need a tune for new gears. But you do need to recalibrate the speedometer for the new gear ratio. This is usually done with a tuner. So if you are spending money on gears, spend another few hundred, and buy a tuner with custom tunes which will only add to your power, and then you will have the added advantage of being able to adjust your speedometer for the new gears.

And welcome to the forums.

00vabchgt · October 8th, 2007, 04:52 PM

welcome aboard. i'm with Zip. if you're worried about Ford voiding your warranty, just get a handheld tuner. it saves the factory tune, so when you take it in to the dealer for anything, just reinstall the stock tune. that's what i did.

Ridinlow6969 · October 8th, 2007, 05:00 PM

now if i get the tuner and tune it for the gears, when i revert back to factory setting to bring it get serviced or for repair work will they be able to see that i had a tune on the computer and that i have aftermarket gears? And which tuner would be the best for me to get?

October 8th, 2007, 04:46 PM	#1
Ridinlow6969 Newbie Join Date: Aug 2007 Location: louisiana Posts: 45	Question about Gears now i know there are a lot of post about rear end gears but i could not find some answers i was looking for and hope that someone can help me out. Im looking to install a set of 3.73's in my 05 v6 mustang, its an auto by the way. And I was wondering if you have to tune the ecu with a after market programmer, or if the gears can be installed without a tune. I know i hear that it will mess with my speedometer but will it have any other bad affects? i read somewheres that a guy was having trouble with his transmission when in overdrive because he didnt tune the ecu for the new gears. The reason im asking this is because the dealers in my area are telling me that they will void my warranty if they see any sign of a programmers chip being used. if anyone has a set of aftermarket gears on without a ecu tune let me know how everything is going, thanx.

October 8th, 2007, 04:51 PM	#2
TheUNZippee! Mods Are People Too! 2007 Mustang GT 282 rwhp/292 rwtq Join Date: Jan 2007 Location: I've got Rags in my bubble and I don't know what to do with it! Posts: 15,102	You do not need a tune for new gears. But you do need to recalibrate the speedometer for the new gear ratio. This is usually done with a tuner. So if you are spending money on gears, spend another few hundred, and buy a tuner with custom tunes which will only add to your power, and then you will have the added advantage of being able to adjust your speedometer for the new gears. And welcome to the forums. __________________ Dyno Pull/MBRP's - The pee Test My Mods Keep your flaming in the Burnout Box if you want to remain a MM member.

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October 8th, 2007, 05:00 PM	#4
Ridinlow6969 Newbie Join Date: Aug 2007 Location: louisiana Posts: 45	now if i get the tuner and tune it for the gears, when i revert back to factory setting to bring it get serviced or for repair work will they be able to see that i had a tune on the computer and that i have aftermarket gears? And which tuner would be the best for me to get?

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