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Old 06-05-2013, 04:44 PM   #1
M.D.P84
 
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Question add 3.91 gears in my camaro L99

hello friends, well I wanted to know what the advantages of having 3.91 gears. good in terms of launching from 0 to 60mph, and that changes in top speed? gains some wrhp?? can help me to clarify these doubts??
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Old 06-05-2013, 04:53 PM   #2
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Torque...or the feel of....Yes. HP....none.

You might have more problems launching because it will probably smoke the tires way more. Consider 3.70 gears.
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Old 06-05-2013, 04:56 PM   #3
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+1 for 3.70 gears
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Old 06-05-2013, 05:03 PM   #4
M.D.P84
 
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Quote:
Originally Posted by caverman View Post
Torque...or the feel of....Yes. HP....none.

You might have more problems launching because it will probably smoke the tires way more. Consider 3.70 gears.
3.70 would be good?? The Camaro 1LE has 3.91 gears, right?? the release will be harmed with 3.91 gears? I'm thinking of doing this mod, to improve launch 0A 60mph or 1/4 mile. thanks for the explanation
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Old 06-05-2013, 05:24 PM   #5
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The 1le has 3.91 but it has different gears in the tranny to off set it. Most auto are going to 3.70 do to the gears inside the auto tranny.
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Old 06-05-2013, 05:31 PM   #6
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What are the stock L99 gears - 3.27 or 3.45? What are the gains over them by going to 3.70? Does changing gearing require a tune?
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Old 06-05-2013, 05:44 PM   #7
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Auto should upgrade to 3.70
Manual should upgrade to 3.91
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Old 06-05-2013, 07:09 PM   #8
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Stock L99 gears would be 3.27
Tune would be required for the speedometer to be accurate aswell for the tranny to shift correctly.
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Old 06-05-2013, 07:10 PM   #9
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I found to buy 3.73 and 3.70, which would be better?? the site has phastek 3.91 to automatic, http://www.phastekperformance.com/20...-gears-391.htm!! what suggestion do you have?? what changes in 0/60mph with 3.73 or 3.91 gears?? top speed decreases or increases?? can affect it?? or could benefit the top speed?? before this mod, I need to have this information, thank you for the comments guys.
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Old 06-05-2013, 10:01 PM   #10
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OP one way to checkout your question is to see what people are running using the setup you are talking about...... I hope this helps out....

3.70


4.10


4.10


Also check the Fast List and see what is working
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Old 06-05-2013, 10:48 PM   #11
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Only do the 3.91's if you are cammed or have a triple disk aftermarket converter. Otherwise do like others said and get the 3.70's. I dont consider wheel spin from 3.91 gears to be the biggest issue as you could always use bigger and stickier tires. Its the fact that it forces a shift into 5th too soon if you dont have a cam with a higher redline or triple disk converter that can be locked up at WOT.
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Old 06-06-2013, 05:45 AM   #12
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Quote:
Originally Posted by Baltimorejohn1 View Post
OP one way to checkout your question is to see what people are running using the setup you are talking about...... I hope this helps out....

3.70


4.10


4.10


Also check the Fast List and see what is working

thank you very much, loved the videos
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Old 06-06-2013, 05:48 AM   #13
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Quote:
Originally Posted by VADER SS L99 View Post
Only do the 3.91's if you are cammed or have a triple disk aftermarket converter. Otherwise do like others said and get the 3.70's. I dont consider wheel spin from 3.91 gears to be the biggest issue as you could always use bigger and stickier tires. Its the fact that it forces a shift into 5th too soon if you dont have a cam with a higher redline or triple disk converter that can be locked up at WOT.
thank you, with 3.91 can hurt top speed ... better off for 3.70!!
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Old 06-06-2013, 06:21 AM   #14
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Shouldn't hurt top speed with 3.91's. It would take alot of HP to reach redline in 6th gear for sure.
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Old 06-06-2013, 10:09 AM   #15
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Im thinking about doing 3.70 Gears as well.
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Old 06-08-2013, 08:10 PM   #16
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This lower (higher numerically) ratio rear drive gear will increase effective rear wheel torque multiplication in 2010 - 2013 SS Camaros by 13% (over standard 3.45 ratio) in a manual tansmission-equipped car, and 20% (over standard 3.27) in an automatic-equipped car. This gearset is the original equipment ratio found in the 1LE 2013 Camaro package.

NOTE: This change will affect the indicated vehicle speed. Recalibration is required for accurate speedometer reading.

https://theblock.com/sema12/part/6
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Old 06-08-2013, 08:13 PM   #17
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Quote:
Originally Posted by M.D.P84 View Post
thank you very much, loved the videos
You're more than welcome
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