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How much and how hard is it to ...

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Old 04-25-2014, 04:42 PM   #1
Join Date: Apr 2014
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Location: CA
Posts: 42
Default How much and how hard is it to ...

... change the rear gear from 3.31 to 3.73?
Is it just changing the gears in the housing of does it require to reprogram anything? I am talking about the manual transmission.
The story is: I am looking for a gray 2014 GT with 3 different specific options one being the rear 3.73. I can't find one in gray but I can find it in silver. I found one gray with the other two options but without the 3.73.

Thanks for your input.
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Old 04-25-2014, 04:49 PM   #2
Mishri's Avatar
Join Date: Nov 2007
Vehicle: 2012 5.0 premuim
Location: Great Falls, MT
Posts: 3,703

It requires a re-program or your speedometer will be off.

Dealership quoted me $1,000 to do it (not including parts).

I had a guy do it for me for $250. (install) and I used my SCT handheld tuner to change the gear ratio to 4.10s. SCT Tuner is like $400. But it also lets you tune the car (more HP, voids warranty on engine)

Automatic, Steeda CAI, 4.10 gears, Boss Intake, BBR O/R X, Steeda Tune, M&H Drag Radials.
12.6@112mph (DA corrected 11.7@119mph)
Originally Posted by ImpOnFire View Post
mishri created the universe

Last edited by Mishri; 04-25-2014 at 05:11 PM.
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Old 04-26-2014, 11:26 PM   #3
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Join Date: Jul 2009
Vehicle: 2012 GT 5.0 prem.
Location: Delaware
Posts: 658

You should have it done by a professional, gears are very specific and if not installed near perfect they will make noise and fail over time!
2012 GT Premium, Paxton 2200 sl,Tial 50 mm bov, Tremec Magnum 6 speed manual, 4:10 Gears, Whiteline lca,steeda adj uca,relocation brackets, Sway bars, watts link, Steeda sport springs, Steeda hd strut mounts, Takico D-spec struts and shocks, Tremec shifter GT-500 Axle Backs...SW x pipe, Dynotech d/s, JLT big air Intake, Rev auto 93 dyno tune, Cervinis Cobra r hood.
Need a used car in Delaware?
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Old 04-26-2014, 11:30 PM   #4
Join Date: Apr 2014
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Location: CA
Posts: 42

It is not a concern for me any more since as you may have seen in my other post, I ended up buying one with 3.73 gears.
Thanks again.
2014 Mustang GT Silver, 6 Speed Manual, Brembo and 3.73 Gears
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Old 04-26-2014, 11:30 PM
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