airlaird

So far I am just lurking on the forum, but I have just returned from Ford after test driving a 2012 5.0 automatic. It pulled well...but I was rather unimpressed with off-the-line acceleration. So, is this because of the 3:15's gearing on it??? ( I think that's what it had). If so, what options are there from Ford for other gearing...or is that what you get with the auto??
airlaird

Ltngdrvr

No optional gear available for the automatic.

Five Oh Brian

No optional gears from the factory for automatic 5.0L's, but that's not really the issue here. The 6 speed automatic features very steep 1st & 2nd gear ratios, so even a 3.15 ring & pinion is plenty. However, the factory tune has lazy throttle tip in plus torque management that keeps power at bay when launching. So, get an aftermarket tune for better throttle response & to eliminate the torque management. It'll feel like a completely different car! And, if that is not enough, get an aftermarket stall converter that flashes closer to 4,000 rpm's at wide open throttle. Circle D makes a great converter for the new automatics. A proper tune and a converter (assuming traction) could drop a full second off the 1/4 mile time vs stock.

airlaird

Thankyou Five oh! So, I assume the 3:73's on the MT would be a helluva kick in the pants on launch??
airlaird

Five Oh Brian

3.73's are okay in my '11, but my manual transmission has less gearing in the trans than an automatic, so it's about the same. The advantage (stock vs stock) with the manual is that I can launch at a much higher rpm. I'd go with 4.56's and a taller rear tire if I were going to bracket race this car (which I won't be).

My supercharged '07 GT (automatic) had a big stall converter and 4.10's. My '03 Mach 1 (manual) had 4.30's. I guess I'm a gear junky. However, with an automatic car there is more performance to be gained with a converter and tune, in my experience.