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Old 10-27-2013, 09:13 PM   #1
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2013 2ls gears

From the research I have done I know this. I have 2.92 gears and to my knowledge the only gears I can put in my rear or better stated the
"Best" are the 3.55 gears. What amount of RWTQ could I expect to see from this change I'm gears. And also what amount of decrease in gas mileage? And excuse my ignorance but why does a higher gear ratio decrease gas milage? Will
It carry my shift points higher?
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Old 10-27-2013, 10:10 PM   #2
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Well, uh... Mathematically 3.55s would give you a 21.6% boost in torque compared to 2.92s... (3.55/2.92)

Gas mileage I'm not sure. That's a bit of a guessing game.

All due respect, I'm going to make this as simple as possible. Basically, the gear ratio is how many times the drive shaft rotates compared to how many times the axles rotate. So with 2.92s the axles rotate 2.92 times before the driveshaft rotates once.

As for cruising RPM, take your current cruising RPM at any given speed and multiply it by the torque multiplication of the gears over stock (so 1.216, or 1 + [3.55/2.92]). So what a speed once was at 2000 rpm is now at 2431 rpm.
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Old 10-27-2013, 10:12 PM   #3
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Forgive me but my post sounds so weird... need someone else to verify it. I'm very tired and don't want to be leading this fellow astray.
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Old 10-27-2013, 10:19 PM   #4
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[QUOTE=DSX_Camaro;7133295]Well, uh... Mathematically 3.55s would give you a 21.6% boost in torque compared to 2.92s... (3.55/2.92)

Gas mileage I'm not sure. That's a bit of a guessing game.


Would make sense that a lower gear ratio (higher number numerically)would give you more torque off the line, and in the same token, at a given speed, your engine would be turning more RPMs in order to sustain that speed.

And that being the case, it will use a little more gas.

The LS and LT cars that are carrying the 3.27 rear ratio are rated at 28 MPG Hwy.
The 2LS with the 2.92 is rated at 30 MPG hwy. (mine gets a little more)
So it would make sense a 2LS running an even lower setup would get less MPGs.
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Old 10-27-2013, 10:37 PM   #5
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Yeah I'm sure I will get less mpg. Thank you both for the information! And dang a 21% increase in torque would be... Amazing. Heck a 15% increase would be more than worth it to get the gears. My only question I have left is would this effect my powertrain warranty?
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Old 10-27-2013, 10:59 PM   #6
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I would venture to say that gas mileage in a high traffic, stop and go environment would be better, as the car does not have to work as hard to get moving from a stop... I imagine the only mpg loss would be on the hwy, however...

http://www.camaro5.com/forums/showpo...4&postcount=11

Read from post 11 onward regarding fitment of the 3.55 gears in a 2ls rear.
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Old 10-27-2013, 11:04 PM   #7
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Quote:
Originally Posted by RacnJsn95 View Post
I would venture to say that gas mileage in a high traffic, stop and go environment would be better, as the car does not have to work as hard to get moving from a stop... I imagine the only mpg loss would be on the hwy, however...

http://www.camaro5.com/forums/showpo...4&postcount=11

Read from post 11 onward regarding fitment of the 3.55 gears in a 2ls rear.

I completely trust your information but how does that happen? Not being able to put the 3.55 in mine? And what gear ratio does the stock ss have?
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Old 10-27-2013, 11:24 PM   #8
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Supposedly a different carrier (ie: 2 series carrier vs 3 series carrier)... Only one person has brought and tried the 3.55 gears in his 2ls and claimed they didn't fit the 2.92 carrier. Supposedly he contacted Richmond, the gear manufacturer and they werent even aware...

A manual SS has a 3.45 ratio, while the auto has the same ratio as the 1ls, and 1/2lt, a 3.27. Swapping to the SS 3.45 rear end would be like an 18% torque gain. Even swapping to someones take out 3.27 a6 v6 rear, a straight swap, would be appx a like 12% gain in tq.
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Old 10-27-2013, 11:34 PM   #9
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Personally, and this is my opinion, is that the gear swap isn't worth it since you have to swap out the whole rear end pretty much and it's not going to cost you less than at least 1000 dollars. And if you're going to do it, I'd at least go with the 1LE gears which are the 3.91. They'd be a vast improvement but your MPG will take a hit.
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Old 10-28-2013, 12:58 AM   #10
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In my Wife's Mustang I replaced the 3.31 gears with 4.10 gears. City mpg got better by 5mpg & hwy only dropped 2mpg. Fun factor when up 100%.

Now I'm looking to install 3.91 gears in her Camaro. Unless you are mostly a hwy cruiser more gear is the biggest bang for the buck.

Even going from 3.73 gears to 4.10 gears in my Suburban made a big improvement in performance & I didn't loose any mpg city or hwy because it stayed in OD longer.
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Old 10-28-2013, 03:54 AM   #11
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Originally Posted by lscamaro View Post
Personally, and this is my opinion, is that the gear swap isn't worth it since you have to swap out the whole rear end pretty much and it's not going to cost you less than at least 1000 dollars. And if you're going to do it, I'd at least go with the 1LE gears which are the 3.91. They'd be a vast improvement but your MPG will take a hit.
What process would I have to go through to get the 3.91 gears?
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Old 10-28-2013, 05:54 AM   #12
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What process would I have to go through to get the 3.91 gears?
In an LS, you will need to swap the diff to one from an SS or LT(M6) to be able to fit 3.91s (or just find a 1LE diff). You may also need to swap axles, hubs and the rear half of the driveshaft to get it to fit (they are required in an A6/V6).
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Old 10-28-2013, 06:26 AM   #13
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In an LS, you will need to swap the diff to one from an SS or LT(M6) to be able to fit 3.91s (or just find a 1LE diff). You may also need to swap axles, hubs and the rear half of the driveshaft to get it to fit (they are required in an A6/V6).
Would I have to have axles,hubs and driveshaft for the 3.45 ss manual swap?
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Old 10-28-2013, 07:44 AM   #14
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Quote:
Originally Posted by 13lstuner View Post
Would I have to have axles,hubs and driveshaft for the 3.45 ss manual swap?
Yes
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Old 10-28-2013, 07:55 AM   #15
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Yes
Where is the best place to find a complete rear axle? And what warranties will this most likely void?
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Old 10-28-2013, 12:26 PM   #16
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Originally Posted by DSX_Camaro View Post
All due respect, I'm going to make this as simple as possible. Basically, the gear ratio is how many times the drive shaft rotates compared to how many times the axles rotate. So with 2.92s the axles rotate 2.92 times before the driveshaft rotates once.
Nope, backwards. The driveshaft would rotate 2.92 times before the axles would rotate once.

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Old 10-28-2013, 03:32 PM   #17
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Nope, backwards. The driveshaft would rotate 2.92 times before the axles would rotate once.

John B.
Reading my post now I can safely say I am retarded. Thank you for clarifying, too.
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Old 10-28-2013, 03:47 PM   #18
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Reading my post now I can safely say I am retarded. Thank you for clarifying, too.
You just got slightly mixed up. Thank you for your input!
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Old 11-12-2013, 10:44 PM   #19
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Greetings all! I've ordered all the parts (3.91 ring/pinion, SS carrier, axles, hubs) to do this swap. I'm sitting at about 3k for parts and install. I tried to go the Richmond route and ran into the same issue, it doesn't fit a 2ls 7.6irs carrier. I'm having the work done at Lucky's Speed and Performance in Longview, TX sometime next week. I've talked with C5 member BlackoutLFX who has swapped to a SS carrier with 3.45 gears (and don't forget the LSD) to make sure the drive shaft fits. He claimed it all mated right up without a hitch. I'll be posting a thread on this with under carriage pictures when the work is done. My expectation is that my little six banger is about to feel like a monster!

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Old 11-12-2013, 11:09 PM   #20
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Would I have to have axles,hubs and driveshaft for the 3.45 ss manual swap?
The SS driveshaft is too short for our cars. I think maybe the SS Trans(tr6060 & 6L80) are bigger than ours, so the drive shaft is shorter as it has less distance to cross. Not sure though could be talking out my ass, but I do know that our drive shafts are not interchangeable.
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Old 11-13-2013, 08:20 AM   #21
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Man I was sure the 3:55 would fit In my 2ls. Damn until I heard on this thread that someone tried it and failed. ..is there any 2ls owner that can dispute this and made the switch.
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Old 11-13-2013, 11:05 AM   #22
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Man I was sure the 3:55 would fit In my 2ls. Damn until I heard on this thread that someone tried it and failed. ..is there any 2ls owner that can dispute this and made the switch.
Just buy the LT carrier and install them. The carrier is only about $120
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Old 11-13-2013, 12:34 PM   #23
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I have a complete 2LT diff setup (3.27 gears) axles and hubs for sale. Was removed at 3,500 miles to install SS diff. Had first fluid changed at 500 miles along with all the fluids ( trans, diff, engine oil ) in the car to full synthetics and again at 3,000 miles.
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Old 11-13-2013, 01:28 PM   #24
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Man I was sure the 3:55 would fit In my 2ls. Damn until I heard on this thread that someone tried it and failed. ..is there any 2ls owner that can dispute this and made the switch.
Sorry buddy, We have a 7.6" gear carrier. It is different from all the other v6's and v8's. I've cried and cried over this, but its just a fact. Luckily it isn't THAT costly to get the bigger V6 gear carrier ($800ish) and that comes with the limited slip differential too.
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Old 11-13-2013, 02:27 PM   #25
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I was wrong, its $221...

The 3.27 (LT) carrier GM p/n 92230616 list price $221.30
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