I got beat up quite a bit when I posted "cons" several times against the swap. I offered my 2 cents whenever I saw someone on the forum considering doing it. I traded out my '08 peg leg for a Getrag, but stuck with the 3.06 gear, precisely because I didn't want the extra RPM on the highway, the reduction in gas mileage, and the additional engine noise for MAYBE a tenth or two at the strip. (Where I might appear maybe twice a year.) You're not the first guy I've heard that's disappointed with the swap. The 3.92 revs 22% higher than the 3.06 at a given speed. THAT'S what you'll notice mostly, and have to learn to live with unless you don't care, and live only to drag race.Am I the only one not that impressed with the difference going from 3.06 open to 3.92 Getrag in an automatic R/T? I guess I'm so used to driving with 4.10's in my other car that it's just not a big deal. This is a list of what I like and don't like.
1. Power is there almost instantly
2. Can leave it in drive and always have power, no lugging around or shifting into a high gear during acceleration
3. Should drop my 1/4 mile time (obviously)
1. Exhaust tone doesn't sound anywhere near as badass as it did (higher RPM's)
2. Highway speed RPM
3. Not enough difference in acceleration to justify the fuel mileage decrease
4. Getrag humming sound
5. Was a B1TCH to install
Finally got a chance to floor it in manual mode today. First gear was spinning, but I guess wheel hopping? Tires were like "chirp chirp chirp chirp". Second gear screeched, and third gear took off. Gets to 100mph faster, but to be honest I'd rather have my original open 3.06 setup back in. I might end up swapping the Getrag gears for 3.55's sometime soon. Overall, not impressed.
I might just switch my Diablo 93 tune back to the factory 87 tune. The gears should make up for the difference, I really don't think the Diablo 93 tune does jack sh-t. Would turning MSD back on give me a couple more MPG with the 3.92 setup? Damn I miss the way my R/T sounded before the swap...
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