3.91 gears on L99 2010 Camaro ss - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

krisprz2010camaross · 03-18-2015, 10:58 AM

I know people on here recommend the 3.73 gears for the auto but what is the advantage over the 3.91 gears? In the future I'm going to get a carbon fiber driveshaft, camshaft, and get ported heads so will the 3.73 still be the better option than the 3.91s after installing all these? I'm planning on staying naturally aspirated as well.

hammdo · 03-18-2015, 11:04 AM

Did it on mine and love the 3.91s -- the auto is geared deeper so 1st and 2nd are a challenge but, I did love them. Really wakes up the car. The 3.91's I had were from GM so they were designed and meant for the car....

I have 3.45s now as I'm SC'd -- but before I changed them, they would just spin the wheels with the SC -- really something...

-Don

krisprz2010camaross · 03-18-2015, 11:26 AM

Quote:

Originally Posted by hammdo

Did it on mine and love the 3.91s -- the auto is geared deeper so 1st and 2nd are a challenge but, I did love them. Really wakes up the car. The 3.91's I had were from GM so they were designed and meant for the car....

I have 3.45s now as I'm SC'd -- but before I changed them, they would just spin the wheels with the SC -- really something...

-Don

Yah the gears I'm looking at are the ones from the 1le so they are gm as well. Would you have kept the 3.91s on you if you didn't go supercharged?

43Camaro · 03-18-2015, 11:47 AM

Love my 3.91 gears. Vast improvement over the stock gearing. Would never go back, and I have no aspirations of going SC....

krisprz2010camaross · 03-18-2015, 12:10 PM

Quote:

Originally Posted by 43Camaro

Love my 3.91 gears. Vast improvement over the stock gearing. Would never go back, and I have no aspirations of going SC....

So it really is noticeable on all modes drive, sport, and manual?

45THanniversarySS · 03-18-2015, 12:21 PM

what is you end goal with the car? with heads, cam, stall (about 3600), 3.91 gears, suspension mod, and a set of radials (and a tune to match of course) you will be running 11's all day...with the right driver it has been known to touch top of 10's. but im sure your not looking for that aggressive right lol? right? if your looking to bring it alive 3.73 will do it but those 3.91 will help trap better numbers with a slightly higher RPM drive...just dont expect to much top speed with 3.91 gears, maybe around 165mph with that build...but you will get there fast

Pro Stock John · 03-18-2015, 12:40 PM

I have 1LE 3.91's in my car. They are a lot of fun.

hammdo · 03-18-2015, 12:44 PM

Quote:

Originally Posted by krisprz2010camaross

Yah the gears I'm looking at are the ones from the 1le so they are gm as well. Would you have kept the 3.91s on you if you didn't go supercharged?

Yep and not looked back. It was a great upgrade. I wanted an auto 1LE, then migrated to ZL1 parts, and now I have a combo!

-Don

krisprz2010camaross · 03-18-2015, 12:51 PM

Quote:

Originally Posted by hammdo

Yep and not looked back. It was a great upgrade. I wanted an auto 1LE, then migrated to ZL1 parts, and now I have a combo!

-Don

I guess I'll get the 3.91 gears then. Do you know around much it will cost to install and recalibrate the speedometer? I'm also gonna have my driveshaft and zl1 fuel pump installed at the same time as the gears.

Dave Coyle · 03-18-2015, 01:11 PM

What ever gear ratio you choose, do not let anyone talk you into buying Richmond Gears!!!! They worked good on the street for me but once at the drag strip where traction is great....they completely blew apart! Go with GM or AAM gears, I went with the 3.73 AAM gears and have been to the track around 6 different times, pulled 1.8 60 ft. times and the gears are still working great! The Richmonds blew up on the 4th pass, on the line, the first time I was at the track with them!

krisprz2010camaross · 03-18-2015, 01:21 PM

Quote:

Originally Posted by Dave Coyle

What ever gear ratio you choose, do not let anyone talk you into buying Richmond Gears!!!! They worked good on the street for me but once at the drag strip where traction is great....they completely blew apart! Go with GM or AAM gears, I went with the 3.73 AAM gears and have been to the track around 6 different times, pulled 1.8 60 ft. times and the gears are still working great! The Richmonds blew up on the 4th pass, on the line, the first time I was at the track with them!

Wow good to know, thanks.

Dave Coyle · 03-18-2015, 01:27 PM

Just don't want you to go through the headache I did! It took out the housing too!!! Richmond did not do anything because they said that they only warrantee their gears on the street and once you go to the track you are not under warrantee! I even told them the box the gears came in stated Street/Strip but got nowhere!!!

olblue75 · 03-18-2015, 03:58 PM

Looking to get mine down at a dealership in AK that does the swap for about a grand with a speedo recal an a warranty

An talked to a guy here locally and he said they did his on a Saturday...

ccb1975 · 03-18-2015, 08:28 PM

just had my 3.91 last week. dealership charged 800.00. no speed cal tho..they said that they couldn't do the cal cause they wasn't aloud to.

03-18-2015, 10:58 AM	#1
krisprz2010camaross Drives: 2010 Camaro 2ss/Rs Transformers Join Date: Aug 2014 Location: Yorba Linda, California Posts: 1,564	3.91 gears on L99 2010 Camaro ss I know people on here recommend the 3.73 gears for the auto but what is the advantage over the 3.91 gears? In the future I'm going to get a carbon fiber driveshaft, camshaft, and get ported heads so will the 3.73 still be the better option than the 3.91s after installing all these? I'm planning on staying naturally aspirated as well. __________________ YouTube:Krisprz garage Insta:kris__perez & krisprz_garage LS3 conversion Vararam intake(tune model) Kooks LT headers & cats delete Corsa ZL1 3" exhaust RedBarn Racing Tune CMS Stage 3 Cam AFR CNC ported heads MSD Spark plug wires LNC-2000 Launch controller NGK TR6 Spark Plugs 1le strut tower brace-TPIS spacers Nick Williams 102mm throttle body Fast lsxr 102 intake manifold Slp 25% UDP Katech Tensioner Pulley Circle D 3600-3700 multi disk Stall GM 3.91 gears DDS carbon fiber driveshaft ZL1 fuel pump & injectors Flex fuel sensor(91/E85) https://wheelwell.com/kris-perez

03-18-2015, 11:04 AM	#2
hammdo 'It's an experiment' Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014 Location: Dallas TX Posts: 8,694 View My Garage	Did it on mine and love the 3.91s -- the auto is geared deeper so 1st and 2nd are a challenge but, I did love them. Really wakes up the car. The 3.91's I had were from GM so they were designed and meant for the car.... I have 3.45s now as I'm SC'd -- but before I changed them, they would just spin the wheels with the SC -- really something... -Don __________________ 747 RWHP 794 RWTQ "Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577

03-18-2015, 11:47 AM	#4
43Camaro Drives: [COTW 8/3/15] 2010 Camaro SS L99 Join Date: Mar 2015 Location: Mooresville NC Posts: 434 View My Garage	Love my 3.91 gears. Vast improvement over the stock gearing. Would never go back, and I have no aspirations of going SC.... __________________ A Little bit of power. ALL WORK DONE BY ME! Just added 2021 ZL1 1LE to the Stable! https://www.camaro5.com/forums/showthread.php?t=418273

03-18-2015, 12:21 PM	#6
45THanniversarySS Builder of fast cars Drives: 2012 2SS 45TH Anniverary Edition Join Date: Apr 2012 Location: FT. CAMPBELL KY Posts: 223	what is you end goal with the car? with heads, cam, stall (about 3600), 3.91 gears, suspension mod, and a set of radials (and a tune to match of course) you will be running 11's all day...with the right driver it has been known to touch top of 10's. but im sure your not looking for that aggressive right lol? right? if your looking to bring it alive 3.73 will do it but those 3.91 will help trap better numbers with a slightly higher RPM drive...just dont expect to much top speed with 3.91 gears, maybe around 165mph with that build...but you will get there fast __________________

03-18-2015, 12:40 PM	#7
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	I have 1LE 3.91's in my car. They are a lot of fun. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

03-18-2015, 01:11 PM	#10
Dave Coyle Drives: 2010 SS , 1970 Z-28, 2002 Avalanche Join Date: Aug 2009 Location: Michigan Posts: 2,524 View My Garage	What ever gear ratio you choose, do not let anyone talk you into buying Richmond Gears!!!! They worked good on the street for me but once at the drag strip where traction is great....they completely blew apart! Go with GM or AAM gears, I went with the 3.73 AAM gears and have been to the track around 6 different times, pulled 1.8 60 ft. times and the gears are still working great! The Richmonds blew up on the 4th pass, on the line, the first time I was at the track with them! __________________ IF IT'S WORTH HAVING, IT'S WORTH WAITING FOR!!!! (AND IT WAS) 434RWHP/403RWTQ Livernois Motorsports 2C Cam kit Kooks 1 7/8 LT Headers/Hi-Flo Cats/Corsa Exhaust Roto-Fab CAI / Port Intake Precission 2400/2800 Converter/3.73 AAM gears Livernois Motorsports Tune Best time: 11.97 @ 117 MPH

03-18-2015, 01:27 PM	#12
Dave Coyle Drives: 2010 SS , 1970 Z-28, 2002 Avalanche Join Date: Aug 2009 Location: Michigan Posts: 2,524 View My Garage	Just don't want you to go through the headache I did! It took out the housing too!!! Richmond did not do anything because they said that they only warrantee their gears on the street and once you go to the track you are not under warrantee! I even told them the box the gears came in stated Street/Strip but got nowhere!!! __________________ IF IT'S WORTH HAVING, IT'S WORTH WAITING FOR!!!! (AND IT WAS) 434RWHP/403RWTQ Livernois Motorsports 2C Cam kit Kooks 1 7/8 LT Headers/Hi-Flo Cats/Corsa Exhaust Roto-Fab CAI / Port Intake Precission 2400/2800 Converter/3.73 AAM gears Livernois Motorsports Tune Best time: 11.97 @ 117 MPH

03-18-2015, 03:58 PM	#13
olblue75 Drives: 2010 2SS/RS Join Date: Dec 2009 Location: Clarksville Tennesse. Posts: 6,064	Looking to get mine down at a dealership in AK that does the swap for about a grand with a speedo recal an a warranty An talked to a guy here locally and he said they did his on a Saturday...

03-18-2015, 08:28 PM	#14
ccb1975 Drives: 2010 WHITE SS Join Date: Nov 2014 Location: Ocean Springs, MS Posts: 753	just had my 3.91 last week. dealership charged 800.00. no speed cal tho..they said that they couldn't do the cal cause they wasn't aloud to.