10-25-2012, 04:15 PM | #1 |
Drives: 2012 Camaro convertible SS RS Join Date: Oct 2012
Location: New Jersey
Posts: 10
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2012 Camaro SS..Rear Diffrential..3.91 gears
Greetings everyone,
I own a 2012 Camaro SS manual transmission. Just got the heads and cams done. I am planning to change the rear diffrential witn 3.91 gears. Do i have to flash the computer after I get the 3.91 gears installed or for manual transmission it does not matter ? |
10-25-2012, 04:17 PM | #2 | |
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Quote:
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10-25-2012, 04:30 PM | #3 |
Track > 1/4 Mile
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I'm sure it will, going to low profile tires messed with my speedo....
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10-25-2012, 04:52 PM | #4 |
Untamed Performance EPT
Drives: 2011 2SS Join Date: Aug 2012
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A tuner such as Diablo Sport Intune its easy, just change the axle ratio and your set. You can even change tire size =]. I know SCT is popular and has better datalogging for engine idle than diablos'
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10-25-2012, 04:55 PM | #5 |
Drives: GM Join Date: Sep 2010
Location: Marydel, DE
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Mine is in the shop having 3.91's installed as we post and yes I am told it needs a tune at least for speedo.
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10-25-2012, 08:58 PM | #6 |
Drives: 2012 Camaro convertible SS RS Join Date: Oct 2012
Location: New Jersey
Posts: 10
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Thanks guys for all your replies. I really appreciat it.
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10-25-2012, 09:01 PM | #7 |
Drives: 2012 camaro Join Date: Aug 2011
Location: Loves Park, IL
Posts: 23
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Yes, I just changed my gear and had to have the tune adjusted.
You will really like the 3.91's. it really balances the feel of the cam change. I had a cam,cai,tune and headers done and did not like the 3.45 gear afterwards. |
12-30-2013, 12:21 AM | #8 |
Fight Crime, Drive Armed
Drives: '14 2SS Yelo Maro, HD collection Join Date: Jun 2013
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That's a lot of gear for a 3.01 first gear transmission. You may want to go with a lower profile tire and/or 3.73 gears. If you gotta have the 3.91s, get some 30" tall rear tires.
With an 11.77 overall first gear on sticky (or drag radial) stock diameter tires, you're gonna break driveline parts. A hard launch will have you shifting before you're sure the car is going straight. Bad juju.
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12-30-2013, 01:07 AM | #9 |
Drives: 2017 2SS M6 Join Date: Jun 2013
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who ever tuned your car can change the speedo calibration from 3.45 to 3.91. takes 5min and should be free.
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12-30-2013, 07:33 AM | #10 | |
Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
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Quote:
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Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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12-30-2013, 09:15 AM | #11 |
Drives: cars Join Date: May 2011
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And you're forgetting that the 1LE has different trans gearing so its not really a valid comparison.
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12-30-2013, 09:26 AM | #12 |
Drives: '14 1LE Join Date: Nov 2013
Location: NJ
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12-30-2013, 09:57 AM | #13 |
Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
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Actually wasn't aware of that but I do know the GXP has the same tranny gearing as the SS. Thanx for the info on the 1LE tranny info, what is its gearing?
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Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
12-30-2013, 09:59 AM | #14 |
Drives: cars Join Date: May 2011
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1LE MM6 w/ 3.91
1st gear ratio: 2.66 10.42 2nd gear ratio: 1.78 6.97 3rd gear ratio: 1.30 5.09 4th gear ratio: 1.00 3.91 5th gear ratio: 0.74 2.90 6th gear ratio: 0.50 1.96 SS M10 w/ 3.45 w/ 3.91 1st gear ratio: 3.01 10.38 11.77 2nd gear ratio: 2.07 7.14 8.09 3rd gear ratio: 1.43 4.93 5.59 4th gear ratio: 1.00 3.45 3.91 5th gear ratio: 0.84 2.90 3.28 6th gear ratio: 0.57 1.97 2.23 |
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