dentalfloss

When swapping from 342 to 410 gear ratio how much can be gained in you 1/4 mile et's. I know it depends on you hp but is there a big difference with a 6 spd manual? Thanks

timd38

There is a thread on it, but I could not find it. There are a large number of people that love their 4:10 gears with a 6 speed manual.

I went from 3:42 to 3:73 and would do it again. The guys with 4:10 gears don't think I went far enough, but it all depends on what your goals are. My goal was to put gears in that worked best with my cam and not have have much impact on driveability. Others are looking to get from A to B as fast a possible, and 4:10 gears will do that. Spend an hour doing a search, but I don't think you will find anyone that regrets putting 4:10 gears in their manual trans car.

C U IN REARVEIW

Does 1st gear become useless with 4:10 gears?

timd38

I have to be frank, I would not put 4:10 gears in my street car, especially if it is a Z51, but lots of people have and enjoy them. Here is the thread I was referring to above.

https://www.corvetteforum.com/forums...ar-end-vs.html

Schoolteacher

No, not at all. I have a z51 trans with 4.10 gears and drive it daily, with cnc ported heads and cam. I went from 3.42 to 4.10 to help get the rpms up into the power band. Before I went 4.10 the car often surged and just didn't run as good.

timd38

I get why you did it, I don't get a stock motor with 4:10, but then again, I bet a bunch of peope wonder why I do what I do!

dentalfloss

Thank you guy's and thank you for the link. I have already read many post on the subject but have not found a clear answer as to if or how much it helps in the 1/4 mile. My only concern is getting better et's and if there is very little difference, then I won't bother. I have a cam, headers, 17" drag radials already. Next is to upgrade my 2005 diff and decide what ratio for low 1/4 mile et's

timd38

I believe that if you upgrade to a Z06 diff, you won't have a 4:10 option, just a standard diff. Plus you end up with spline count issue because the Z06 has more splines. I built a complete diff from parts and would not recommend that. To may small parts that end up causing you a great deal of pain. I built a Quaife with hardened output shafts, the big pinion bearing and a ZR1 pump. Don't need the pump for drag racing, but you may want the other parts.

Enjoy!

Vito.A

You might try modeling your setup with one of the software programs available. Pat Hale writes Quarter Jr just for this purpose. Run it with the 3.42 gear and then again with 3.90 and 4.10 gears and see what the difference is.

Pitufina

I personally think that gears will gain 1-2 tenths and maybe more in some occasions, BUT you better have some sticky tires. Before I went FI I was going to do a gear swap to complement my cam.

martysauto

Maybe you should go for a ride with someone who has 4.10's and see what you think.

Spying Beast

You don't like traction? 4:10 gears will render your stock C-6 first gear useless, first and second if you're making power.

Best of luck with that. Sincerely though, I'd really like to hear your honest opinion if you did decide to swap.

A word to the wise, stock Diff and Trans and the addition of 4:10 gears combined with a dead hook at the strip will leave those 4:10 gears and parts if your Diff on the strip, right after launch.

Beast

martysauto

I thought that only applied to c5's??

Spying Beast

Just my opinion on the matter. I know that at 700whp, first gear is useless and my rear tires break loose at 5500RPM's in second gear and i run Z06 standard gearing, far shorter than 4:10's.

If your car is bone stock and you want to pick up some low end torque and make 6th gear more than cruise control at 85 mph, THEN IMHO 4:10 gears would make sense. If you're making power above 550 or so, all it's going to do for you is smoke tires for that half a second youre in first gear.

There are tons of guys on here running or have run 4:10 gearing, their opinions should be valued far more than mine never having run them.

Best of luck, PLEASE let us know how they work for you. You will pick up a quarter of a second easily on the quarter mile.

Beast

GARY2004Z06

If you wish to maximize ET in an N/A setup, 4.10s are the only practical way to go. As for street driving, traction can be a challenge. We put down 495 on a Mustang dyno through 4.10s. We opted for MT drag radials as our street tire and the throttle still requires modulation in first but will hook in second. Acceleration is very good.
To answer your question with respect to ET gain, that is far more difficult to assess and is related to driver ability. An excellent driver may gain a tenth or so while a so-so driver may gain several tenths. A bad driver will most likely go the other direction since they will only be spinning the tires.

timd38

I think this is the answer!

GARY2004Z06

Here is a C6 Z51 with 4.10s, heads and a blower cam. (The owner originally wanted the option to go FI in the future.) This is one of its very first passes at the track. (not particularly a great pass either)


About a month later this car went on to go 10.37 @ 133.59.
At 26:46 and 33:14 you can see the same car make 10.41 passes.

Boomer111

4:10's are fine for a bolt on only car LS3.

dev1360

I have a cammed LS3 M6 with 4.10s. Mods are in sig. I'll find out what I gained in a few weeks when the track opens. Looking for 10.7x with the addition of a bias ply and front skinnies.

Car is also a daily. Highway mileage and city driving are easy as ever. Not a single regret.

jim2092

Use a rear end ratio that matches your tire and RPM goals at the end of the quarter mile. What are your present RPMs at the end of the 1/4 mile now?