Buying a modified GT

Steve13210

Junior Member
Joined
Dec 8, 2025
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Location
Syracuse, NY
"Soft below 3000rpm" is an understatement. Out on a flat highway at 65 mph (around 2000 rpm), 5th gear would not accelerate at all. Leaving a stop light was very sluggish. I'm trying to convince my son that he'd enjoy the car more if he had a stock cam that was fun to drive in town, which is where he'll do almost all his driving.

How do you tell that it has 3.31 gears? What does a professional gear swap cost these days? I did a gear swap myself in my underpowered 1995 Jeep many moons ago--would this Mustang be significantly harder to DIY?


Sadly, there are not plenty of unmolested manual-transmission mustangs around here at any price. I would really love to find him a stock 2011 V6 manual, but those simply don't exist within 100 miles of us, and we can't spend an entire day road tripping to see a car that we might not buy.
The rear end should be stickered - although that might be long gone. If not, you can perform a drive shaft turn test. The 3.31 was standard on automatic transmissions and the V6, and the 3.55 was standard on the manuals, but for instance, mine was changed to the 3.31 to take advantage of higher revs (or so I believe) with the supercharger the previous owner added.
 

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