3.91 vs 4.11 on Cammed Manual SS - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

4WDlifeform · 12-21-2018, 11:56 AM

Hello all. Looking for some advice on gear ratio. I just installed a mild cam, Comp Cams LSR: 231/239 duration @ .050", .617/.624 lift, 113deg.

After driving around for about a week, I am finding that its a bit of a bear around town. Below 1600rpm, the engine has nothing. In parking lots, I'm reving up, slipping clutch, dodging people like an a$$hole..! And on the other side, 6th gear is way too tall. At 70mph a slight hill starts to choke it and I'll need to shift into 5th.

So, I am left wondering if the 4.11 gears would be a better move over 3.91 gears? I'd be grateful to hear from those with cam and gears, what ratio you chose, and how you like it? Much appreciated!

cypressh · 12-21-2018, 12:35 PM

I am Cammed and am Running 4.11's. On the highway I would almost prefer to have 3.91's as In 6th at 120KM/H Im around 2400 RPM.

zz430camaro · 12-21-2018, 12:56 PM

4.10 on a big Camaro all day long

zlathim · 12-21-2018, 01:02 PM

acammer convinced me to go 4.10s over 3.91s and I am glad that I took his advice. It feels like these are the gears the car should have come from the factory. No more lugging around town at low speeds.

Dbunch9 · 12-21-2018, 01:33 PM

If im not mistaking, the coyote guys that put our tr6060 in their cars put 4.10s in the rear to keep the gearing similar to stock. I also believe we have taller tires than the coyotes, for those reasons I have 4.10s in my room waiting to go in, just need a fresh diff and axles to go in with the gear.

4WDlifeform · 12-21-2018, 05:15 PM

Wow, unanimous so far. I appreciate the comments! I think there is only one clear way to move forward here.!!

Quote:

Originally Posted by cypressh

I am Cammed and am Running 4.11's. On the highway I would almost prefer to have 3.91's as In 6th at 120KM/H Im around 2400 RPM.

2400rpm doesnt seem to bad, might be a bit fast, but that is about where the cam seems to start working very well!

Quote:

Originally Posted by zlathim

acammer convinced me to go 4.10s over 3.91s and I am glad that I took his advice. It feels like these are the gears the car should have come from the factory. No more lugging around town at low speeds.

Definitely do not want that lugging around town and in parking lots, etc. Excited, glad I asked the question!

Now I guess, any recommendations? I was going to go GM for the 1LE 3.91, but I do not think GM makes a 4.10 kit?? Thanks again!

TheFlyingBananaSS · 12-21-2018, 05:59 PM

With 3.91 at 60mph I'm doing around 2000rpm give or take.

bkevind · 12-21-2018, 06:50 PM

Weird. at 60mph with my 3.91 in 6th gear is like 1200rpm. :P

Chris49066SS · 12-21-2018, 09:25 PM

Quote:

Originally Posted by 4WDlifeform

Wow, unanimous so far. I appreciate the comments! I think there is only one clear way to move forward here.!!

2400rpm doesnt seem to bad, might be a bit fast, but that is about where the cam seems to start working very well!

Definitely do not want that lugging around town and in parking lots, etc. Excited, glad I asked the question!

Now I guess, any recommendations? I was going to go GM for the 1LE 3.91, but I do not think GM makes a 4.10 kit?? Thanks again!

Motive 4.10s are what you want. Acammer and zlathim both Motive 4.10s. Get yourself the diff cover as well, they can tell you all the fixins they have. I am 3.91

Taylortoons · 12-22-2018, 04:11 PM

My only regret with 3.91 is not going with 4.10. My rpm in 6th gear at 70 mph is around 2k. My big cam doesn’t cruise well at low rpm.

JooktheSnooke · 12-26-2018, 09:34 AM

i too am debating this, though my cam is a stage below yours

zlathim · 12-26-2018, 10:17 AM

Quote:

Originally Posted by Chris49066SS

Motive 4.10s are what you want. Acammer and zlathim both Motive 4.10s. Get yourself the diff cover as well, they can tell you all the fixins they have. I am 3.91

One word of warning on the Motive gears. Mine are very loud. I know it has a lot to do with my poly cradle bushings and diff bushings, as well as the LPW diff cover, but man these gears can be loud.

I drained the oil over the weekend and there wasn't an excessive amount of metal on the magnets, so I don't think the gears are unhappy, just noisy.

If I decide that I can't stand the noise of these particular gears, I might try out a set of 4.11s from Yukon.

JooktheSnooke · 12-26-2018, 10:48 AM

Quote:

Originally Posted by zlathim

One word of warning on the Motive gears. Mine are very loud. I know it has a lot to do with my poly cradle bushings and diff bushings, as well as the LPW diff cover, but man these gears can be loud.

I drained the oil over the weekend and there wasn't an excessive amount of metal on the magnets, so I don't think the gears are unhappy, just noisy.

If I decide that I can't stand the noise of these particular gears, I might try out a set of 4.11s from Yukon.

does the brand or gear size play any part into how noisy they are?

zlathim · 12-26-2018, 10:58 AM

Quote:

Originally Posted by JooktheSnooke

does the brand or gear size play any part into how noisy they are?

I honestly don't know, but the shop that installed my gears said Motives are usually pretty good gears. I'm guessing that some sets are just noisier than others, maybe even from the same manufacturer.

12-21-2018, 11:56 AM	#1
4WDlifeform Drives: 2014 Camaro 1SS RS Join Date: Oct 2017 Location: Pittsburgh Posts: 75	3.91 vs 4.11 on Cammed Manual SS Hello all. Looking for some advice on gear ratio. I just installed a mild cam, Comp Cams LSR: 231/239 duration @ .050", .617/.624 lift, 113deg. After driving around for about a week, I am finding that its a bit of a bear around town. Below 1600rpm, the engine has nothing. In parking lots, I'm reving up, slipping clutch, dodging people like an a$$hole..! And on the other side, 6th gear is way too tall. At 70mph a slight hill starts to choke it and I'll need to shift into 5th. So, I am left wondering if the 4.11 gears would be a better move over 3.91 gears? I'd be grateful to hear from those with cam and gears, what ratio you chose, and how you like it? Much appreciated!

12-21-2018, 12:35 PM	#2
cypressh Canadian Drives: 2011 Camaro 2SS/RS Join Date: Dec 2013 Location: Lumsden Saskatchewan Posts: 406	I am Cammed and am Running 4.11's. On the highway I would almost prefer to have 3.91's as In 6th at 120KM/H Im around 2400 RPM. __________________ 2011 Camaro SS/RS --------------------------------------------------------- The cars we drive say a lot about us.

12-21-2018, 12:56 PM	#3
zz430camaro Drives: 2015 1LE Join Date: Oct 2015 Location: Cleveland, OH Posts: 1,485	4.10 on a big Camaro all day long __________________ 2015 1LE, TSP 225/236 113+3, VMAX Throttle Body, CAI with race scoop, GPI Ported Intake, Land Speed Stage 2 Heads, 1-7/8 headers, NPP exhaust, 25% Fluidampr, LT1-S Monster Clutch, 485 RWHP & 444 TQ

12-21-2018, 01:02 PM	#4
zlathim Drives: 2010 Camaro 2SS/RS M6 Join Date: May 2009 Location: Idaho Posts: 726	acammer convinced me to go 4.10s over 3.91s and I am glad that I took his advice. It feels like these are the gears the car should have come from the factory. No more lugging around town at low speeds. __________________ GPI SS2; EE E2 catch can; SP 1 7/8" LT Headers w/ hfc; FM AT 3" cat-back; CAI Cold Air Intake; AEM Wideband Tuned by GPI McCleod RXT; MGW flat stick; Ram Clutch slave cylinder & hydraulic adjuster BMR cradle & diff bushings, trailing arms, toe rods & upper control arm bushings Hotchkis sub-frame brace Stop Tech Z-23 brakes 4.10 gears, Eaton Truetrac, LPW diff cover Best 1/4 mile 12.073 @ 115.68 mph 3,300 ft DA

12-21-2018, 05:59 PM	#7
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	With 3.91 at 60mph I'm doing around 2000rpm give or take. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

12-21-2018, 01:33 PM	#5
Dbunch9 Drives: 2010 Camaro 2SS Join Date: Aug 2016 Location: Orlando, FL Posts: 294	If im not mistaking, the coyote guys that put our tr6060 in their cars put 4.10s in the rear to keep the gearing similar to stock. I also believe we have taller tires than the coyotes, for those reasons I have 4.10s in my room waiting to go in, just need a fresh diff and axles to go in with the gear.

12-21-2018, 06:50 PM	#8
bkevind Drives: 2013 2SS RS 1LE Join Date: Aug 2016 Location: Austin Posts: 555 View My Garage	Weird. at 60mph with my 3.91 in 6th gear is like 1200rpm. :P __________________ 468, Mishimoto rad + oil cooler, TSP LTH MCS 2WNR CTSV/ZL1 front calipers/rotors + G-Loc Forgestar CF-5 19x11

12-22-2018, 04:11 PM	#10
Taylortoons Drives: 2011 2SS/RS LS3 Join Date: Apr 2017 Location: Dallas Posts: 482	My only regret with 3.91 is not going with 4.10. My rpm in 6th gear at 70 mph is around 2k. My big cam doesn’t cruise well at low rpm. __________________ GPI Built Procharger D-1/13 PSI/Race Intercooler/SS3 Cam Kit/Kooks LTH/X- pipe/FIC 1050/E85/3.91 gears/Centerforce Dual Disc clutch/Flowmaster Outlaw/775whp/680tqSOLD

12-26-2018, 09:34 AM	#11
JooktheSnooke Drives: 2010 camaro ss Join Date: Sep 2018 Location: new york Posts: 156	i too am debating this, though my cam is a stage below yours __________________ 2010 Cyber Gray Metallic 2SS/RS LS3 6 Speed -- Rotofab CAI \| Stainless Works Longtubes w/ high flow cats \| Muffler Delete \| TSP 229/244 stage 2 cam\| TSP .660" Spring Kit \| TSP CNC Ported Heads \| Mulling high volume oil pump \| PTB \| Trunnion upgrade \| Hurst short throw shifter \| Elite Engineering Catch Can \| Exedy stage 1 clutch \|