My old 2003 GT came with 3.27's, stock. I had every bolt on for that car but the heads, cams and intake were untouched. I only managed 266rwhp and 309rwtq - with the factory tune. I eventually got 4.10's for it and frankly, I wasn't impressed. Which is why I've been so reluctant to get gears for my 2012.
The gears don't effect the torquey 4.6 as much as the high revving 3.7.
Max torque came in around 3000 rpm on your 4.6 right? Ran out of steam around 5800 rpm? You getting to higher rpms quicker wasn't as crucial because your power band was in the midrange. The 3.7 makes its peak power at close to 7k rpm. The gears help put the smaller high revving engine into its powerband much better. The 4.6's powerband is down low and therefore gears won't be as dramatic on a engine like that. Sent from AutoGuide.com Free App