3.91 Gear Swap Question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

djrasras · 09-19-2014, 12:06 PM

I am planning on swapping the stock 3.27 ring and pinion in my manual 2010 v6 to the 3.91. It seems that Motive and Richmond have a bad rep with their gears making noise, so I have narrowed it down between GM's 1LE 3.91 and Lingenfelter LPE 3.91

Just wanted to know your guy's experience with the 3.91 and what brands you guys use. I also have an IPF supercharger and I don't want 1st gear to be too short which is why I might do 3.70 instead

MagnumForceGB · 09-19-2014, 02:01 PM

That first gear worries me on manuals, 4.46 or something, end ratio would be 17.5168, tire shredding ratio. You will need to be a good shifter and have great tires to get good times at the track.

djrasras · 09-19-2014, 02:02 PM

What brand are you looking at? And ya I might be leaning towards 3.70

DSX_Camaro · 09-19-2014, 02:04 PM

Quote:

Originally Posted by djrasras

I am planning on swapping the stock 3.27 ring and pinion in my manual 2010 v6 to the 3.91. It seems that Motive and Richmond have a bad rep with their gears making noise, so I have narrowed it down between GM's 1LE 3.91 and Lingenfelter LPE 3.91

Just wanted to know your guy's experience with the 3.91 and what brands you guys use. I also have an IPF supercharger and I don't want 1st gear to be too short which is why I might do 3.70 instead

See, you make high rpm power. Normally I would say don't do it. With this scenario, I recommend 3.73s but 3.91s will work too. Your first gear will be very short (end around 35mph) but because of the high rpm power supercharger, well... shit will get weird.

MagnumForceGB · 09-19-2014, 02:07 PM

I have to swap out my entire differential, so I'm doing a 1LE differential with 3.91's from the factory. Any time you swap gears there is a chance of gear whine, can't be avoided.

Gears can be fun though if you don't mind the gas mileage drop.

djrasras · 09-20-2014, 02:44 PM

Why is it that Lingenfelter sells 3.70 and Richmond 3.73?

DSX_Camaro · 09-20-2014, 02:52 PM

Quote:

Originally Posted by djrasras

Why is it that Lingenfelter sells 3.70 and Richmond 3.73?

It's like how there's a 4.10 gear and a 4.11 gear. 4.10 is 41 teeth on one gear and 10 teeth on the other. 4.11 is 37 teeth on one gear and 9 on the other. So chances are 3.70 is 37 teeth and 10 teeth, while 3.73 is probably something like 30 and 8 or 33/34 and 9.

10RsCamaro · 09-20-2014, 03:07 PM

Good luck on the swap! I had to do the whole diff because I am an auto, and went with 4.11. Love how it launches! If you have any questions pm me.

R.i.p gas mileage

kjkjr27 · 09-20-2014, 08:02 PM

Quote:

Originally Posted by MagnumForceGB

I have to swap out my entire differential, so I'm doing a 1LE differential with 3.91's from the factory. Any time you swap gears there is a chance of gear whine, can't be avoided.

Gears can be fun though if you don't mind the gas mileage drop.

I have this whine when I am cruising around 4-45mphs...it starts when I lightly press on the gas but goes away once I accelerate.

CodyBanks · 09-27-2014, 03:51 PM

Not familiar with gear upgrades. What does this do, how does it feel ect ?

Ventmaster · 09-27-2014, 06:50 PM

A gear that is numerically higher (say a 3.91 vs a 3.27) is considered a "lower" gear. Let's call'em bigger gears.

You reach peak engine speed sooner (at a lower speed) with a bigger gear. This gives your engine a mechanical advantage and can allow it to accelerate more quickly than an identical car with smaller gears- even though the car's not producing anymore power.

In short, when driving you'll reach higher RPM at lower speed.

09-19-2014, 12:06 PM	#1
djrasras Drives: 2010 2LT Bumblebee Join Date: Apr 2013 Location: Maryland Posts: 613	3.91 Gear Swap Question I am planning on swapping the stock 3.27 ring and pinion in my manual 2010 v6 to the 3.91. It seems that Motive and Richmond have a bad rep with their gears making noise, so I have narrowed it down between GM's 1LE 3.91 and Lingenfelter LPE 3.91 Just wanted to know your guy's experience with the 3.91 and what brands you guys use. I also have an IPF supercharger and I don't want 1st gear to be too short which is why I might do 3.70 instead __________________ AirLift Air Suspension, Stainless Works Long Tube Headers + Hi-Flo Cats, Resonated X-Pipe, MRT V2 Mufflers, VMAX Ice-olator and Ported Throttle Body, Barton Short Throw Shifter, CAI Intake + Air Scoop

09-19-2014, 02:01 PM	#2
MagnumForceGB Drives: Fastest 2010 Camaro V6 Join Date: Apr 2010 Location: Newcastle, OK Posts: 3,571 View My Garage	That first gear worries me on manuals, 4.46 or something, end ratio would be 17.5168, tire shredding ratio. You will need to be a good shifter and have great tires to get good times at the track. __________________ Camaro V6 = 11.268 @ 120.11

09-19-2014, 02:02 PM	#3
djrasras Drives: 2010 2LT Bumblebee Join Date: Apr 2013 Location: Maryland Posts: 613	What brand are you looking at? And ya I might be leaning towards 3.70 __________________ AirLift Air Suspension, Stainless Works Long Tube Headers + Hi-Flo Cats, Resonated X-Pipe, MRT V2 Mufflers, VMAX Ice-olator and Ported Throttle Body, Barton Short Throw Shifter, CAI Intake + Air Scoop

09-19-2014, 02:07 PM	#5
MagnumForceGB Drives: Fastest 2010 Camaro V6 Join Date: Apr 2010 Location: Newcastle, OK Posts: 3,571 View My Garage	I have to swap out my entire differential, so I'm doing a 1LE differential with 3.91's from the factory. Any time you swap gears there is a chance of gear whine, can't be avoided. Gears can be fun though if you don't mind the gas mileage drop. __________________ Camaro V6 = 11.268 @ 120.11

09-20-2014, 02:44 PM	#6
djrasras Drives: 2010 2LT Bumblebee Join Date: Apr 2013 Location: Maryland Posts: 613	Why is it that Lingenfelter sells 3.70 and Richmond 3.73? __________________ AirLift Air Suspension, Stainless Works Long Tube Headers + Hi-Flo Cats, Resonated X-Pipe, MRT V2 Mufflers, VMAX Ice-olator and Ported Throttle Body, Barton Short Throw Shifter, CAI Intake + Air Scoop

09-20-2014, 03:07 PM	#8
10RsCamaro Slow v6 Drives: Automatic Automobile Join Date: Oct 2011 Location: Nj Posts: 526	Good luck on the swap! I had to do the whole diff because I am an auto, and went with 4.11. Love how it launches! If you have any questions pm me. R.i.p gas mileage __________________ Full bolt on 2lt/Rs. Any questions? always a pm away! Obx/Mace/Rx/Mrt/Vararam/Bcam/4.11 Gears/SS Brakes USAF. Stationed in TX

09-27-2014, 03:51 PM	#10
CodyBanks CodyBanks Drives: 2011 Camaro Join Date: Aug 2012 Location: New York Posts: 110	Not familiar with gear upgrades. What does this do, how does it feel ect ?

09-27-2014, 06:50 PM	#11
Ventmaster Drives: 2017 1SS 6spd Join Date: Jan 2011 Location: Utah Posts: 3,023	A gear that is numerically higher (say a 3.91 vs a 3.27) is considered a "lower" gear. Let's call'em bigger gears. You reach peak engine speed sooner (at a lower speed) with a bigger gear. This gives your engine a mechanical advantage and can allow it to accelerate more quickly than an identical car with smaller gears- even though the car's not producing anymore power. In short, when driving you'll reach higher RPM at lower speed.