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Old 03-12-2012, 03:15 AM   #51
taz
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gears

My head is hurting trying to read and decyhper the information out on the threads. Hope you guys can keep me from getting a major migraine.

I currently own a 2010 Camaro RS/SS L99 engine with an auto trans. modded a few parts. Running Maggie TVS-2300 magnacharger, dual fuel pump, 2800 Yanks Stall converter, Trans cooler, line-lock, Kooks 1/7/8 inch LT headers w HF cats, Corsa catback exhaust. Custom Forged Vossen 3 piece wheels, so running the 315x20 size wheels in the rear. Moved the oem rear wheels to the front.The car was dynoed at 540rwhp.

Next month will be installing the DSS 9inch Conversion kit and wanted to know what gears would you recommend me to run. I will be installing the Strange center section,

After the conversion kit is completed, we will be installing a LSX440 forged internals with a twin turbo for forced induction. we are hoping to get 1000+rwhp out of this combo.

Car will mostly be a daily driver, with some scca races on the weekends. We lost the lease to the land the track was located at, so currently looking for a new home for a 1/4 mile track.

I think the 4.11 would be digging ditches and not a good choice with this kind of power. Maybe a 3.7, 3.73, 3.9??? What gearing would you think be the best for me?

Thanks,
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Old 03-30-2012, 08:50 PM   #52
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Awesome thread!!

Hey Taz, try out the new 3.91, I think I may go that way.
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Old 04-29-2012, 01:20 AM   #53
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Dont know if I read this correctly somewhere:

V8 Auto and V6 Auto/Manual: 3.27 gears
V8 Manual: 3.45 gears

Did I fub up?
Cheers.
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Old 05-02-2012, 08:42 PM   #54
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Quote:
Originally Posted by Stealthpanda View Post
Dont know if I read this correctly somewhere:

V8 Auto and V6 Auto/Manual: 3.27 gears
V8 Manual: 3.45 gears

Did I fub up?
Cheers.

You are correct....
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Old 05-21-2012, 02:54 PM   #55
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Hey guys, I am also looking at going with 3.91s with a M6, would you suspect the extra 250 rpms at 80mph in 6th gear would affect the highway mpg much? I would think the lower gears would actually increase the mpg around town due to less strain on the motor, but I am concerned with the highway mpg because I drive the camaro long distances more frequently than around town.
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Old 12-18-2012, 03:28 PM   #56
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Quote:
Originally Posted by Toyaholic
What do you have to do to get the speedo correct when the gears are changed? Does this require a tune? Don't want to knock it out of warranty.
Quote:
Originally Posted by Squintz Palladoris View Post
A tune is required.
Couldn't one just use this to calibrate their speedo while leaving their factory tune intact?:


http://www.autoanything.com/performa...A3757A0A0.aspx



or

http://www.amazon.com/Hypertech-7320...SIN=B003CSQC86

Last edited by L99BEN; 12-18-2012 at 04:28 PM.
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Old 12-18-2012, 04:32 PM   #57
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Quote:
Originally Posted by L99BEN View Post
Couldn't one just use this to calibrate their speedo while leaving their factory tune intact?:


http://www.autoanything.com/performa...A3757A0A0.aspx



or

http://www.amazon.com/Hypertech-7320...SIN=B003CSQC86
Either way, it is an adjustment of the factory settings on the ECM, which in turn = loss of powertrain warranty in most cases (ask you local dealership to be sure).
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Old 12-18-2012, 06:59 PM   #58
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Originally Posted by blazzin1 View Post
Either way, it is an adjustment of the factory settings on the ECM, which in turn = loss of powertrain warranty in most cases (ask you local dealership to be sure).
I had my gears swapped on my 12' 5.0 with the speedo calibrated at the dealer and no effect on warranty. If I calibrated on my own using an SCT tuner for example, they may have had an issue with that since it involved a reflash.
I don't see how calibrating your a speedo would have an effect on your powertrain especially with a device specifically designed to calibrate the speedo only.
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Old 12-18-2012, 08:09 PM   #59
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Originally Posted by L99BEN View Post
I had my gears swapped on my 12' 5.0 with the speedo calibrated at the dealer and no effect on warranty. If I calibrated on my own using an SCT tuner for example, they may have had an issue with that since it involved a reflash.
I don't see how calibrating your a speedo would have an effect on your powertrain especially with a device specifically designed to calibrate the speedo only.
Like I said, go talk to your local dealership, there are a few that are more lenient than others on this subject. Maybe Ford had a different policy? I just know I've heard it on here many, many times....ANY change to the factory settings on the ECM is an automatic void of the powertrain warranty in most cases. Call up your service manager at your dealership......and let us know what he says.
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Old 12-18-2012, 10:07 PM   #60
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Quote:
Originally Posted by blazzin1 View Post
Like I said, go talk to your local dealership, there are a few that are more lenient than others on this subject. Maybe Ford had a different policy? I just know I've heard it on here many, many times....ANY change to the factory settings on the ECM is an automatic void of the powertrain warranty in most cases. Call up your service manager at your dealership......and let us know what he says.
I hear you and will look into it with my dealer but nothing automatically voids your whole warranty just like that.
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Old 12-20-2012, 11:26 PM   #61
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I had a stock Formula in 1987, with a rare 3.73 gear option from the factory with a 350 tuned port injection and the car was freaky fast for the era. Rear end gears help a LOT. I would love to get another 3.73 with my 5th gen. It would make a difference.
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Old 12-24-2012, 03:08 PM   #62
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THANKS FOR THE INFO FROM U AND EVERY ONE
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Old 12-25-2012, 11:30 PM   #63
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Now that the 1LE has the 3:91 gears, I can't see why the dealer can't install then, while still maintaining the powertrain warranty, but then again like most have said I guess it depends on the dealer, but it's worth a shot.
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Old 12-26-2012, 11:02 AM   #64
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Quote:
Originally Posted by Kronix View Post
Now that the 1LE has the 3:91 gears, I can't see why the dealer can't install then, while still maintaining the powertrain warranty, but then again like most have said I guess it depends on the dealer, but it's worth a shot.
You would think so and probably only for the manual and not auto since the 1LE only comes in manual
I had 3.73's installed in my 12 5.0 ( a factory option)and the dealer was cool about the overall powertrain warranty but if I had any issues with my rear end it would be on my dime...
Also make sure to find someone that knows what they're doing with gear installs. Ive had it done by so call experience professionals (one a dealer)and both times they made noise loud enough to hear over the radio.
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Old 06-27-2013, 11:24 AM   #65
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Many thanks to danhr for this thread. I have a couple of questions as a result of all this good info.

1. So... the stock/factory gears in my 2013 SS L99 Coupe are 3.27s?
2a. Assuming the answer to #1 is yes, if I want "quicker" 1/4 miles times I should go to 3.47s or 3.73s?
2b. Which gears are optimal for increased times with excellent reliability?
3. For highway cruising (I take frequent trips), how will the higher gears (3.47s or 3.73s) affect MPGs, road noise, etc.

Thanks for any input.
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Old 06-27-2013, 11:33 AM   #66
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Quote:
Originally Posted by PalmerGA View Post
Many thanks to danhr for this thread. I have a couple of questions as a result of all this good info.

1. So... the stock/factory gears in my 2013 SS L99 Coupe are 3.27s?
2a. Assuming the answer to #1 is yes, if I want "quicker" 1/4 miles times I should go to 3.47s or 3.73s?
2b. Which gears are optimal for increased times with excellent reliability?
3. For highway cruising (I take frequent trips), how will the higher gears (3.47s or 3.73s) affect MPGs, road noise, etc.

Thanks for any input.
i went from 3.27 to 3.73 and saw appx 250rpm difference going 70
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Old 06-27-2013, 12:48 PM   #67
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Quote:
Originally Posted by PalmerGA View Post
Many thanks to danhr for this thread. I have a couple of questions as a result of all this good info.

1. So... the stock/factory gears in my 2013 SS L99 Coupe are 3.27s?
2a. Assuming the answer to #1 is yes, if I want "quicker" 1/4 miles times I should go to 3.47s or 3.73s?
2b. Which gears are optimal for increased times with excellent reliability?
3. For highway cruising (I take frequent trips), how will the higher gears (3.47s or 3.73s) affect MPGs, road noise, etc.

Thanks for any input.
If u have the traction 3.73 will. Help u getting out the hole a lot

i run 4.10s which make my gearing about the same auto with 3.73.. fine daily driving. I do 25k a year. MPG went down like 1 or 2.. considering these cars have wide gears its fine
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Old 09-23-2013, 08:19 PM   #68
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I'm looking for the torque spec for the rearend end caps and back lash
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Old 11-13-2013, 01:16 PM   #69
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wow .... I'm all confused

I already have a supercharger and a stall convertor .... would I see or feel anything by changing the gears on My A6 SS? Was going to try and get the 3.91's but now they are on back order and from this It sounds like I'm wasting my money with the whipple and stall already there
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Old 01-29-2014, 07:16 PM   #70
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Wow man I forgot about that song, Bitchin Camaro, by the dead milkmen, remember hearing that for the first time back in the 80's when a buddy of mine with an 86 Mustang GT, brought a cassette into my car which was an 87 Formula 350, he said you have to hear this song by the DEAD MILKMEN, I thought it was a very cool song,
and was the last thing I expected to hear from a punk band like that! Thanks for posting it, brings back cool memories!
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Old 11-02-2014, 08:37 AM   #71
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Does the z28 and zl1 use the same m6 ratio as an ss? Or are they using different ratio's inside the m6 along with the 3.91 gears?
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Old 01-20-2015, 03:24 AM   #72
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Why aren't you covering the 3.91 gear on this?
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Old 05-29-2015, 12:53 PM   #73
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Question rearend gear ratio

I feel stupid but i dont know what diff gears i have in my 2013 ss2 auto (l99). Was thinking of switching to 3.73s. Anyone have input for me and cost estimate?
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Old 05-31-2015, 10:40 AM   #74
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Rear end gear ratio

Quote:
Originally Posted by danhr View Post
After seeing numerous threads about gears, I figured I would do a small write up. Hopefully when people search and find this, they find their answers. Maybe it is good enough to even become a sticky. If you feel anything is wrong or maybe I left something out, feel free to comment and I will add it accordingly.

What is a ring and pinion?

Simple answer: Your driveshaft spins a pinion. Your pinion in turn spins the vertically mounted ring gear. Your ring gear is directly bolted to your differential, which turns your halfshafts/axles.

Here is a quick illustration (please note that this is a solid axle system, not an independent rear suspension, like our cars have. I choose to use this picture, because I feel it is easier to grasp the concept of a ring and pinion through a solid axle)


Part number 8 is your ring and pinion. The part on the right is your pinion, the part on the left is the ring gear

What do the numbers "3.73" "4.10" "4.33" etc mean?

Simple answer: It is how many times your driveshaft turns for every time your wheel spins once. For example, with 4.33's, if your wheels spins once, your driveshaft will turn 4 1/3 times. A simple formula to figure out what gear ratio you have is to take the number of ring teeth there are and divide it by the number of pinion teeth there are.

Will I loose top speed if I do gears?
Simple answer: No! actually if anything you will gain top speed! A stock LS3 top speed in 6th gear, with factory gears is 269 mph! Your car will never see that kind of speed (well if yours does, my hats off to you!). Assuming your speed governer is removed, you will be limited by how much power you are making and aerodynamics. Putting a more aggressive gear ratio in will put you in a higher rpm, which means you will be putting more power to the ground, getting you to a higher mph.

What gear ratio is best for me?
Simple answer: Automatics: 3.73's Manuals: 4.10's

More in depth answer: It varies on your setup. The main factor (assuming that the car's goal is optimal 1/4 mile time) is that you want to be a few hundred rpms past your redline when crossing the traps in the 1/4 mile.

A quick run down, if you trap the following in the 1/4... then here's a general idea of what gear you should get (this is assuming you have a 6200 redline... if yours is different, then use the calculator found on the bottom of this post):

Manuals:
< 122 mph: 4.33's
122-129 mph: 4.10
129-142 mph: 3.73
142-153 mph: 3.45

Automatics:
< 106 mph: 4.33's
106-112 mph: 4.10
112-123 mph: 3.73
123-133 mph: 3.45
133-140 mph: 3.27

Now this is assuming you have the suspension and tires to effectively utilize the given gear ratio. Some people ask "Well can I put 4.10's in my L99/6L80E?" The quick answer: Yes... but it is going to be an interesting ride. GM isn't dumb and knew that this heavy car was going to need some help getting moving, and put a steep 4.027 for 1st gear in the automatics. Paired that 4.10's, it will be A VERY AGGRESSIVE 1st gear. If you have the suspension/tire to withstand it, it will be a very very aggressive launch.

That being said, putting a more aggressive ring and pinion allows you to get into your "powerband" faster. Your powerband is the "sweet spot," so to say, of your motor, where it makes the most useable power. The faster you get into it, the faster your car goes. On the other end of the spectrum, you can "run out of gear." This is when you go past your power gear (4th gear for our cars) and have to shift into overdrive. This does not offer an ideal 1/4 mile time

Can I install gears myself?

Yes, but I would highly recommend against it, unless you've had some practice. Setting up gears is very time consuming and takes a little experience to get it right. I would suggest having someone with you that has done a few, if you are attempting to do this yourself. It is very easy to mess something up, and gets very frustrating. And the results can be catastraphic.

If you do not have this knowledge/experience at your disposal, I would highly recommend getting the work done at a reputable shop.

Will I gain rwhp if I install a set of gears?

No. Actually if anything, you might lose a little bit of rwhp (a negligable amount) due to an increase in parasitic drivetrain loss. This is greatly offset, because you will be getting into your powerband faster. The "butt dyno" will think you gained a lot of power, because you will be climbing the rpms faster, but in reality, you will be at the same power level.

Are gears noisey?

Simple answer: Yes and No. It's kind of a trick question. Some gears will make noise... even when properly setup. However, a good indication that the gears are not setup properly is excessive noise. This is why it is highly recommended to have someone, who knows what they are doing, around. I'm not saying one can't have a "crash course" and get it right on their first try. But it is not worth the risk, in my opinion.

Should I do anything else when I'm doing the ring and pinion?

Simple answer: Yes! It is a great time to install a set of differential bushings, as the differential will already be out, and it's one of those "well while I'm in there" things. Differential bushings are fairly inexpensive and will save you time and money down the road.

I installed a set of gears, it lowered my ET, but my mph (trap speed) went down? What's wrong?!

Simple answer: Absolutely nothing! As mentioned before, you are not adding horsepower with a set of gears, you are just accelerating faster. So your car just doesn't make it up to 115 mph to finish the 1/4 mile now, it only has to get up to 112 mph (I'm just making up numbers here, they are not accurate). Generally speaking, the higher you go with a gear, the lower your ET will get, but it will also lower your trap speeds. This is assuming you are not running out of gear in the last part of the 1320.

Are 4.10's prone to breakage?

I feel this is a touchy subject. Some say yes, I say no. There have been a few failures. But what you don't read is how many people haven't broken their 4.10's. I hope no one hijacks this thread and turns it into a "are 4.10s weak?" thread, but in this thread, it will just be left as: "Do a search, and make your own decision"
If you feel I should add anything, or anything is incorrect, please say so, and I will adjust this post accordingly. I will end this with an old saying that I was once told:

"Don't fear the gear!"


A few numbers that people will ask....

Manual transmissions (LS3/TR6060)

3.45 gears:
Top speed in X gear:
1st: 51 mph
2nd: 74 mph
3rd: 107 mph
4th: 153 mph
5th: 182 mph
6th: 269 mph

RPM at XX mph in 6th gear:
60 mph: 1380 rpm
70 mph: 1610 rpm
80 mph: 1850 rpm

3.73 gears:
Top speed in X gear:
1st: 47 mph
2nd: 68 mph
3rd: 99 mph
4th: 142 mph
5th: 169 mph
6th: 249 mph

RPM at XX mph in 6th gear:
60 mph: 1500 rpm
70 mph: 1750 rpm
80 mph: 2000 rpm

4.10 gears:
Top speed in X gear:
1st: 43 mph
2nd: 62 mph
3rd: 90 mph
4th: 129 mph
5th: 154 mph
6th: 226 mph

RPM at XX mph in 6th gear:
60 mph: 1650 rpm
70 mph: 1925 rpm
80 mph: 2200 rpm

4.33 gears:
Top speed in X gear:
1st: 41 mph
2nd: 59 mph
3rd: 85 mph
4th: 122 mph
5th: 145 mph
6th: 214 mph

RPM at XX mph in 6th gear:
60 mph: 1733 rpm
70 mph: 2025 rpm
80 mph: 2325 rpm


Automatic transmissions (L99/6L80E)

3.27 gears:
Top speed in X gear:
1st: 40 mph
2nd: 68 mph
3rd: 106 mph
4th: 140 mph
5th: 190 mph
6th: 242 mph

RPM at XX mph in 6th gear:
60 mph: 1525 rpm
70 mph: 1800 rpm
80 mph: 2050 rpm


3.45 gears:
Top speed in X gear:
1st: 38 mph
2nd: 65 mph
3rd: 100 mph
4th: 133 mph
5th: 180 mph
6th: 230 mph

RPM at XX mph in 6th gear:
60 mph: 1625 rpm
70 mph: 1900 rpm
80 mph: 2125 rpm

3.73 gears:
Top speed in X gear:
1st: 35 mph
2nd: 60 mph
3rd: 90 mph
4th: 123 mph
5th: 166 mph
6th: 212 mph

RPM at XX mph in 6th gear:
60 mph: 1750 rpm
70 mph: 2033 rpm
80 mph: 2333 rpm

4.10 gears:
Top speed in X gear:
1st: 32 mph
2nd: 55 mph
3rd: 84 mph
4th: 112 mph
5th: 151 mph
6th: 193 mph

RPM at XX mph in 6th gear:
60 mph: 1933 rpm
70 mph: 2033 rpm
80 mph: 2566 rpm

4.33 gears:
Top speed in X gear:
1st: 30 mph
2nd: 52 mph
3rd: 80 mph
4th: 106 mph
5th: 143 mph
6th: 183 mph

RPM at XX mph in 6th gear:
60 mph: 2033 rpm
70 mph: 2366 rpm
80 mph: 2700 rpm

If you have a different redline or different than stock height tires, and feel like doing the calculations yourself. Or if you are bored and feel like playing with some numbers, I use this calculator:

http://f-body.org/gears/

The Gear Ratios for a TR6060 (manual) are:
1st: 3.01
2nd: 2.07
3rd: 1.43
4th: 1.00
5th: 0.84
6th: 0.57
R: 3.28

The Gear Ratios for a 6L80E (automatic) are:
1st: 4.027
2nd: 2.364
3rd: 1.532
4th: 1.152
5th: 0.852
6th: 0.667
R: 3.064
I am never going past 180 mph, so should I keep the stock 3.27 or go with a 3.45, 3.73 or the gm 1le option 3.91 for my L99?
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Old 05-31-2015, 10:51 AM   #75
Wvurah09
 
Drives: 2015 2SS/RS L99
Join Date: May 2015
Location: WV
Posts: 19
Rear end gear

I have a 2015 2SS/RS with a L99 3.27. I have found options at gm parts for a 3.45 like in the LS3, and a 3.91 that comes in a 1LE. What should I do?
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