1LE 3.91 Install Question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

jesse454545 · 03-02-2015, 02:07 PM

How hard is it to instal the 3.91 1LE Gears into a 2011 camaro LS3 and if it is possible does someone have a write up on how to do it? Also is this something someone can DIY or is it something that needs to be done in a shop?

Apex Motorsports · 03-02-2015, 04:48 PM

Yes the 3.91 gears can be installed in any SS. However, it is not a DIY job. Installing gears is an IRS rear end is a pretty complicated 6+ hour job even for a professional.

jesse454545 · 03-02-2015, 04:51 PM

okay i thought it was a simple swap of gears but i guess not. Is there anyway to verify what kind of gears you have in the rear end. I bought my car used and it had alot of modifications already and not sure if thats one of the things he modified. im still finding modification and its been 2 years since i bought the car lol

Stock Ain't Fun · 03-02-2015, 05:56 PM

There are several videos on YouTube that show you how to determine gear ratio. Find one that suits your needs.

Scooter18155 · 03-02-2015, 05:57 PM

Quote:

Originally Posted by jesse454545

okay i thought it was a simple swap of gears but i guess not. Is there anyway to verify what kind of gears you have in the rear end. I bought my car used and it had alot of modifications already and not sure if thats one of the things he modified. im still finding modification and its been 2 years since i bought the car lol

I believe there is a way by disconnecting your driveshaft spinning your wheel 1 revolution and counting the revolutions on your rear end where drive shaft connects. Not 100% sure exactly how this works (I've never done it just read about it) but I'm sure someone else may know and comment

avido · 03-03-2015, 01:59 AM

hi.saturday i got my gear sswapped. it.s a real pain in the ass. 5h of job. it's not complicated but you have to use a correct preload for the bearing use a specific tools and check if everithing is ok before reinstall on the car.

EM1/SS · 03-03-2015, 08:20 AM

Quote:

Originally Posted by jesse454545

okay i thought it was a simple swap of gears but i guess not. Is there anyway to verify what kind of gears you have in the rear end. I bought my car used and it had alot of modifications already and not sure if thats one of the things he modified. im still finding modification and its been 2 years since i bought the car lol

You should be able to figure it out based on what gear your in, your speed, and your RPM.

lownslowss · 03-03-2015, 08:32 AM

I can't believe there's not a tag on the diff.

CamaroCracka · 03-03-2015, 12:45 PM

Quote:

Originally Posted by Scooter18155

I believe there is a way by disconnecting your driveshaft spinning your wheel 1 revolution and counting the revolutions on your rear end where drive shaft connects. Not 100% sure exactly how this works (I've never done it just read about it) but I'm sure someone else may know and comment

You spin the drive shaft and count how many revolutions it takes to turn the wheels one revolution. The number of times you turn the driveshaft is your gear ratio, e.g. almost 4 revolutions would be a 3.91, 3.5 revolutions a 3.45.

03-02-2015, 02:07 PM	#1
jesse454545 Drives: 2011 CAMARO 2SS/RS Join Date: Feb 2013 Location: SAN DIEGO & TEXAS Posts: 345	1LE 3.91 Install Question How hard is it to instal the 3.91 1LE Gears into a 2011 camaro LS3 and if it is possible does someone have a write up on how to do it? Also is this something someone can DIY or is it something that needs to be done in a shop? Attached Images

03-02-2015, 05:56 PM	#4
Stock Ain't Fun Drives: 2015 2SS 6M Coupe Join Date: Feb 2015 Location: Not here Posts: 41	There are several videos on YouTube that show you how to determine gear ratio. Find one that suits your needs. __________________ 2015 2SS Coupe LS3 6M Stainless Power Headers with Cats CAI Inc. Air Intake JRE Tune

03-03-2015, 08:32 AM	#8
lownslowss PaPa Smurf Drives: 2022 SS 1LE Join Date: Jul 2014 Location: League City Posts: 632 View My Garage	I can't believe there's not a tag on the diff. __________________ 2022 Rapid Blue SS 1LE

03-02-2015, 04:48 PM	#2
Apex Motorsports Drives: 2000 Camaro SS Join Date: Feb 2010 Location: Louisville, Ky. Posts: 25,179	Yes the 3.91 gears can be installed in any SS. However, it is not a DIY job. Installing gears is an IRS rear end is a pretty complicated 6+ hour job even for a professional.

03-02-2015, 04:51 PM	#3
jesse454545 Drives: 2011 CAMARO 2SS/RS Join Date: Feb 2013 Location: SAN DIEGO & TEXAS Posts: 345	okay i thought it was a simple swap of gears but i guess not. Is there anyway to verify what kind of gears you have in the rear end. I bought my car used and it had alot of modifications already and not sure if thats one of the things he modified. im still finding modification and its been 2 years since i bought the car lol

03-03-2015, 01:59 AM	#6
avido Drives: camaro ss\rs Join Date: Jun 2014 Location: Italia Posts: 755	hi.saturday i got my gear sswapped. it.s a real pain in the ass. 5h of job. it's not complicated but you have to use a correct preload for the bearing use a specific tools and check if everithing is ok before reinstall on the car.