What gains are people seeing in the 1/4 going to 3.73s or 4.10s from the 3.15's. I have a 12' Gt and am considering the swap if the gains are worth it (Gas mileage difference / cruising rpms etc.).

 

I had 3.73 in my car and went to 4.10 gears and all I can say is wow. I also just added a Circle D converter 4C 3800 stall and at 140km on the highway I am reving at 3000 rpm and I could care less about gas mileage.

 

I wouldnt go beyond 373's, Imo! If you drive it on a regular basis then stay away from 410's

 

Yea I drive it pretty regular. Just looking to get into the 11's. I'm cutting 12.15 now. Cai ,93 tune & drs

 

I vote for neither. Jimmy Vaccaro has been 11.4's with his auto/3.31's and WBT has gone 11.00 with his auto/3.31's. Both have converters and you would gain far more out of one of those. Heck Jimmy Vaccaro says he may even go back to his 3.15's. Depending on what size tires you run a 3.73 or 4.10 gear may actually slow you down as you'll be shifting into 4th before you cross the line.

 

I have a set of 3:55's I'll be putting in my auto 2012. I will be running a 28" tall DR 295/55/15

 

3.31's or 3.55's

 

A converter was/is my first choice but I'd have to get another tune and the converter installers/ tuners aren't close to me. I wouldn't want to begin to install it in my driveway. I would have it professionally installed and tuned but there's just nowhere close. I was looking at gears because the settings are already in my SCT from steeda and i could do it myself. But yeah I totally agree, my first choice is a converter and a proper tune to go with it. Low 11's seems the norm on those cars(which is insane).