New gears installed today - WOW

[VADER SS L99]

Originally Posted by axis

Cammed AND increasing the redline.

Well, I wouldn't recommend spinning a stock L99 past 6200 RPM so that would limit it to about 111mph in 4th with a stock converter or single disk aftermarket converter and 117mph in 4th with a locked triple disk converter. 3.91's and a triple disk converter would surely work for a bolt on L99 with a 6200RPM limit but I think the off the line torque of the stock L99 cam and a triple disk converter and 3.91's would be a bear to handle on DR's. So who is going to be the first bolt on L99 to try a triple disk converter and 3.91's? Would love to see how the traction is with say a 305/45R18 MT ET II drag radial.

[caverman]

Originally Posted by 62nalide

Damn, I like the idea of 3.91s but still leaning on 3.45s but I WANT 1/4 test done! lol I bet you love those gears too

Originally Posted by MrGs SS

I was thinking of going 3.45. Just seems like a better fit for the street, my opinion.

Unless you have a bunch of HP, 3.45 in an A6 is a waste of money. Minimum I would do is 3.70 for sure. I have 3.91 in my M6 and it feels perfect. Car should've come with these gears (well at least the 1LE does). I could almost do 4.11 in an M6.

I didn't notice any increased ET on an 1/8th mile track but stop light to stop light it feels so much better.

Gears are a #2 MUST DO mod. Headers and a tune are still #1 in my book.

[Pro Stock John]

Sure but many of us have run over 112 with bolt-ons and no converter, I think if I had added those gears instead of a converter I'd run probably 12.2@115 if I could hook it, and not sure about that.

Someone send me a pumpkin ready to go and I'll do it. I'll get some slicks too.

[Baltimorejohn1]

Originally Posted by dab86

Just had some 3.91 gears thrown in my L99 Camaro and they are amazing! Car feels 1,000 lbs lighter and much more powerful. If you do not have gears, I highly recommend you get them. Best mod I have so far. I have Headers, Full 3 inch exhaust, CAI intake, and the gears really made the biggest performance difference besides sound. The gears are quiet too. Thanks to Erik and Josh at Lashway Motor Sports in South Florida. They are the best so give them a call!

NICE.... Congrats Enjoy!!!!

[Camarojt]

Originally Posted by VADER SS L99

Well, I wouldn't recommend spinning a stock L99 past 6200 RPM so that would limit it to about 111mph in 4th with a stock converter or single disk aftermarket converter and 117mph in 4th with a locked triple disk converter. 3.91's and a triple disk converter would surely work for a bolt on L99 with a 6200RPM limit but I think the off the line torque of the stock L99 cam and a triple disk converter and 3.91's would be a bear to handle on DR's. So who is going to be the first bolt on L99 to try a triple disk converter and 3.91's? Would love to see how the traction is with say a 305/45R18 MT ET II drag radial.

This is what is keeping me curious, Bc so far nobody has tried it in a bolt on only triple disc locked set up! 6200rpms would be perfect! I think the traction on a car that's already hooking would still be ok.

I guess we have to wait and see who wants to be a Guinnee pig!

[Nutro]

So I'm guessing with:

3:91
Night Fury
L99
Triple disk 3800 stall
Long tubes
Tune

I should be a stump pulling traction losing high-revving mother of a torque monster?

[62nalide]

Originally Posted by caverman

Unless you have a bunch of HP, 3.45 in an A6 is a waste of money. Minimum I would do is 3.70 for sure. I have 3.91 in my M6 and it feels perfect. Car should've come with these gears (well at least the 1LE does). I could almost do 4.11 in an M6.

I didn't notice any increased ET on an 1/8th mile track but stop light to stop light it feels so much better.

Gears are a #2 MUST DO mod. Headers and a tune are still #1 in my book.

How so? Thought the A6 have aggressive 1st gear so the 3.45s would wake them up? Been told 3.45s would be the way to go but

[Camarojt]

Originally Posted by 62nalide

How so? Thought the A6 have aggressive 1st gear so the 3.45s would wake them up? Been told 3.45s would be the way to go but

3.45 is not a waste of time in an auto car! caverman has a stick car and different geared tranny!

Especially a 3.45 with mine or juices tire size is right at the equivalent to a 3.70. So it's all relevant to what combo you have and why you are choosing a certain gear! If its just a feel good mod for red light to red light then yes 3.91's are a great mod, but if you are trying to nail down your 1/4 mile performance then it becomes critical to pick the right combination.

[trw427ss]

Originally Posted by Camarojt

3.45 is not a waste of time in an auto car! caverman has a stick car and different geared tranny!

Especially a 3.45 with mine or juices tire size is right at the equivalent to a 3.70. So it's all relevant to what combo you have and why you are choosing a certain gear! If its just a feel good mod for red light to red light then yes 3.91's are a great mod, but if you are trying to nail down your 1/4 mile performance then it becomes critical to pick the right combination.

[JANNETTYRACING]

Originally Posted by Camarojt

I doubt a 3.91 gear in an A6 on the street hooks fine! If you nail it with all the nannies off it should blow your tires away!

Might be ok at the track with a set of sticky Mickeys!

All of us drag racers wanna know if you can stay out of 5th gear. And if you are still stock converter, most likely you will shift to 5th. Unless you have a triple disc converter.

3.91 have an effective 4.49 Final gear in 4th with the 6L80E

You can get through the traps in 4th up to about 117 at 6200 RPM

It takes 550 Crank HP to move 4300 lbs. 117 mph

The final drive is not as big a factor in the gear selection as first gear is 4.09:1

As power levels exceed 550 RWHP we found in testing the A6 is faster with Less Rear Gear in the 60 ft.

SuperchargedSS runs a 3.45 Gear for 9.8 ET at 139 MPH and has 7200 RPM capability

Which Shows the More Power you have the Less Gear you need and Vise Versa

Ted.

[Baltimorejohn1]

Originally Posted by caverman

Unless you have a bunch of HP, 3.45 in an A6 is a waste of money. Minimum I would do is 3.70 for sure. I have 3.91 in my M6 and it feels perfect. Car should've come with these gears (well at least the 1LE does). I could almost do 4.11 in an M6.

I didn't notice any increased ET on an 1/8th mile track but stop light to stop light it feels so much better.

Gears are a #2 MUST DO mod. Headers and a tune are still #1 in my book.

I agree I have never understood why people don't do this first.....
If I'm spending more money it is paramount that what I do first makes it go faster a lot not a little.....

But do understand to each his own so I respect the fact others see it different....

[caverman]

I agree that everyone has their own opinion on which gears to go with and the combination of all your parts would definitely make a difference.

Gears aren't a cheap mod...the were even more when I did mine ($1,400 at the time). So, IMO, going from a 3.27 to 3.45 you're only doing about a .2 difference in ratio is almost a waste of time. Will you feel it, sure....but obviously going from 3.27 to a 3.70 (about .45 difference) would be double you feel in torque. I went from a 3.45 to 3.91 which is almost a .5 of a difference and I can't imagine going any less on my car.....again, that's my opinion.

I just think if you're going to spend the money then go with the more torque so you don't end up buying gears again. Almost like saying buy an SS instead of an LT so you don't end up wasting money on upgrading down the road when you figure out the V6 is not enough power.

Now, if you have a tire combo that's going to make your final drive basically 3.70 then you're fine their as well. I'm assuming a stock sized wheel/tire combo. I'm also a assuming basic bolt-ons. You start stepping up to high HP with forced induction or big motor or NOS then that would make a difference as well.

It's all in your combo and what you plan to do with the car. Just my two cents.....

[Pro Stock John]

To Ted's comment about gears, gear size goes up and down depending on power levels.

For slower bolt-on cars, more gear is good, helps us maximize the 360-400rwhp we make. Even for 400-500rwhp NA setups, gear is still good. same reason.

For A6 cars, there are combos that will benefit from keeping a stock gear (3.27), and that's because at high power levels it's hard to hook 700RWHP with that stock 4.03 first gear, AND a 3.91 with the slicks/ drag radials we can buy.

In fact with our 1800HP LSX drag car, less gear in first then stock is good because we less gear means we can run more boost at the launch.

But for us simple NA folk, gear is good, but I don't know if we can hook a 3.91 gear + stock internal + 18" DR.

[M.D.P84]

behave like a camaro ss: with k & n intake, 25% underdrive, and 3.91 gears in a a6?? I love making pulled from 0 to 60mpg, would greatly improve??? final velocity would look like?? arrive faster in the final speed?? I'm using original tires. My compliments and thanks from now, the solution in this doubt.