rygi23

Are you auto? Don't know your set-up. You saying your 4.10s are too much or your 3.73s are not enough? Thx.

WannaBeGearHead

I had a different GT earlier this year. Full exhaust, 3800 stall, 4.10s, full suspension. I would have run out of gear earlier than I'd like. The few hundred RPMs extra I'd get from 3.90s would have been nice plus I'm 99.9% sure I wouldn't have noticed the difference between the two.

crash

Not to thread jack buuuuuut, would you two think it is worth it to go from 3.73's to 3.90's? I bought my B with 3.73's but have always tossed the idea around of either going 3.90's or 4.10's. I'll be going to the track soon and plan to over the summer. Thoughts?

WannaBeGearHead

Can't say really if it'd be worth the money to change gears. I think ctgreddy went from 3.73s to 4.10s. He'd be a good person to ask.

TRUEBLUE3934

CRASH,
I went from 4.10 to 3.73, and then to 3.90 all in about 4 months. I know the relative difference in feel between all of those gears with no other mods. Obviously, the 4.10s give the most pull but run out quicker. After 4.10s, the 3.73s felt a little slow out of the hole and 2nd and 3rd didn't have the same feel either. There was a noticeable improvement from 3.73 to 3.90, but it wasn't quite as strong as the 4.10s. For a DD that gets a few passes at the track, I highly recommend the 3.90 gear. If maximum ET is the goal, and you won't run out of rpm, 4.10 is absolutely the way to go.

I don't think you would be disappointed with an upgrade to 3.90 from 3.73 if you like to make some passes with the car. For what it is worth... the ratio is actually 3.91:1 (which puts it numerically right between 3.73 and 4.10). Not that it makes any difference, but I don't know why they are listed as 3.90???

jsmarsh25

i run Motive 3.90's, and I love them. Highly recommend the ratio. rpm's are still a little high on the highway, but you have to give a little to get a little, ya know

rygi23

Are you auto, too? Don't see a stall listed in your mods. Thx.

WannaBeGearHead

Ya he's not auto. It's tough talking to people with gears who aren't auto. Autos need gearing bad and I don't think manual gearing is the same as auto gearing.

Rygi, have you thought about running 4.10s and a 27" tire to be able to squeeze out a few more MPH at the track? Thinking back on it and how 4.10s add just a few hundred more RPM I'd probably keep them and run a taller tire. 4.10s and a stall made for a fun car.

rygi23

The gearing is very different. I ran a 4.10 in my Mach and sometimes wish I'd gone 4.30. The auto OD .70 ratio just doesn't allow that unless the car is just for the track. I don't like doing the different tire size thing. I like racing it in the exact same form it is on the street. Worked well with the Mach so I figure just keep things simple. That's all my budget will allow anyhow, lol.

Btw, here's the gear calculator I use. It's very helpful, if the link works.
http://www.paladinmicro.com/pmicro.p...InGearCalc.htm

WannaBeGearHead

Yup that's the calculator I used. You'd have no problem revving the auto to 5800-6000 so you'd get the extra MPH you're looking for. I think you'd be very happy with either gear choice though.