11-20-2018, 10:14 PM | #1 |
Drives: 2010 Camaro 2SS/RS M6 Join Date: May 2009
Location: Idaho
Posts: 726
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I want 3.91s
I'm going to buy the parts, pull the differential and take it to a drivetrain shop in town for the gear install. Help me with the logistics, please...
Who makes the best gear sets for our cars? Besides gears, what other parts do I need to purchase? The car has 65K miles on it. I am assuming that I should at least freshen up the clutches, but I admit that I am somewhat ignorant about these rear differentials. Do they make a master install kit with bearings and clutches? If so, how much should I plan to spend on just those parts? TIA for any help.
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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 |
11-20-2018, 11:33 PM | #2 |
Drives: 2010 SS L99 Join Date: Sep 2018
Location: Missouri
Posts: 1,634
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Janettyracing.com is who I ordered from. They have the 1LE 3.91s for like 275. Ordered them, had them in 3 days, and am totally satisfied with the results. They go well with my setup. I only needed the gears, not the full kit. I can't remember what all came in the kit, but I didn't need it, and had GPI do the gears for me. Taking a diff off is one thing, but setting the gears up is something I wanted to leave to them
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Previous PB:11.079 @ 122.99mph.. New setup time: TBD
The 11.079 pass: https://youtu.be/pz27Zq54t_E Build thread - www.camaro5.com/forums/showthread.php?t=555371 |
11-21-2018, 05:43 AM | #3 | |
Angewendet Ingenieur
Drives: 14 Camaro ZL1 Join Date: Apr 2015
Location: USA
Posts: 401
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Quote:
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LQ9, Iron Block, Forged internals, 408CI, Jannetty custom cam, TS short block, Whipple, Hardened Jackshaft, PRC 260, 2X3 Dynatech Full Competition, HF Cats, CAI, NW 103, Chee, ID 1300, COPO Breather, MSD, Fore Dual Pump, ultratorque, E85, dual Meth, True Trac, 3:45, 1500hp axle-shafts, DSS CF, BMR, custom Pearl/Candy paint by Jaidah. |
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11-21-2018, 07:26 AM | #4 |
Drives: 2010 Camaro 2SS Join Date: Jul 2018
Location: Connecticut
Posts: 183
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Jannetty is doing mine this coming Tuesday. I can't wait.
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2010 Camaro 2SS. Summit White.
1 7/8" 304 Dynatech Stainless Headers with High Flow Cats and Ceramic Coating, Cold Air Inductions Intake System with Scoop, SCT X3 Programmer, Moroso Catch Can, Heater Hose Upgrade 3.91 Gears, Eaton TrueTrac Posi, Billet Main Caps, Ported Throttle Body 1LE Suspension. ZL1 Springs, 2.9L Whipple Ssupercharger |
11-21-2018, 09:23 AM | #5 | ||
Drives: 2010 Camaro 2SS/RS M6 Join Date: May 2009
Location: Idaho
Posts: 726
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Quote:
Quote:
Please let me know what you think.
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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 Last edited by zlathim; 11-21-2018 at 09:34 AM. |
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11-21-2018, 09:50 AM | #6 |
Drives: 2010 camaro ss Join Date: Sep 2018
Location: new york
Posts: 156
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why do u say that? whats FI have to do with the rear gears?
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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 |
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11-21-2018, 10:23 AM | #7 | |
GPI Sales Consultant
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Quote:
It's the best mod I've ever done on my car - if you're going to go through the trouble of doing gears, why not take all you can? I did them when I was bolt on and it transformed the car. I can't imagine going with less gear than that in the M6. There isn't a downside that I see, all upsides. With regard to the rest of the logistics you'll definitely need the full install kit. I wanna say that the ring and pinion was about $330 from motive, and maybe another $300 for the install kit. Another thing to strongly consider is doing a different carrier - the stock posi is well known to get weak and end up a "1 tire fire" unit over time. JRE does make a kit to tighten up the clutches. Alternatively, Eaton sells the TruTrac ($610) carrier which is a gear based posi which is quite a bit stronger. While you're beefing things up, an LPW diff ($240) cover is an option to consider. It's a cast steel piece that gives some much needed strength to the weak aluminum factory case. Additionally, it has load bolts that help hold the ring gear caps in place. JRE does make a billet set of main gear caps, but the LPW cover solves for the ring gear caps issue and helps strengthen the entire case for a similar price. RDP has some really good black Friday promos going right now that might save you some money...
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GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph.
Got a question about a GPI product? Feel free to shoot me a message! |
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11-21-2018, 10:34 AM | #8 |
Drives: 2010 SS L99 Join Date: Sep 2018
Location: Missouri
Posts: 1,634
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Some people think that 3.91 is overkill for FI setups, even 3.73, with stories of people roasting their tires off with all that torque, especially with the aggressive 1st gear in the 6L80. I guess I'll find out the hard way when I eventually do a Whipple and keep the 3.91s and go with a sticky tire. Am I going to break some stuff? Probably. But we are talking a 3,800 lb car with tall tires, it needs all the torque it can get.
__________________
Previous PB:11.079 @ 122.99mph.. New setup time: TBD
The 11.079 pass: https://youtu.be/pz27Zq54t_E Build thread - www.camaro5.com/forums/showthread.php?t=555371 |
11-21-2018, 10:50 AM | #9 |
Drives: 2017 Chevy Sonic RS 1.4T Join Date: Sep 2017
Location: Riverview, Florida
Posts: 327
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Great point! Although a v6 runs in around 3,600 lbs. I would still get the 3.91 if you dont plan on trading up anytime soon.
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2015 Camaro RS/SS SIM LS3- Sold
2017 Sonic Mosaic Black RS 1.4T |
11-21-2018, 11:01 AM | #10 |
Drives: 2010 Camaro 2SS/RS M6 Join Date: May 2009
Location: Idaho
Posts: 726
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Good question. It looks like I need to do some more researching. I'm interested in seeing what gear guys are trapping in with 3.91s vs. 4.10s.
__________________
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 |
11-21-2018, 11:17 AM | #11 | |
GPI Sales Consultant
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Quote:
So then, the 4.10 is the way to go without a doubt from a quarter mile perspective, you're gonna be in 4th any way you look at it even with a bolt on car, and you want all the RPM you can get in 4th. A 4.56 would even be appropriate, but nobody makes one that can live in such a small housing. Take some time and play with gear ratios - there is a lot to learn. This is a great calculator here. Here are the trans ratios and tire sizes: M10 (regular SS) ratios 1st: 3.01 2nd: 2.07 3rd: 1.43 4th: 1.00 5th: 0.84 6th: 0.56 Final: 3.45 Tire: 28.66" diameter MM6(1LE SS) ratios 1st: 2.66 2nd: 1.78 3rd: 1.30 4th: 1.00 5th: 0.74 6th: 0.50 Final: 3.91 Tire: 27.85" diameter
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GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph.
Got a question about a GPI product? Feel free to shoot me a message! |
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11-21-2018, 12:02 PM | #12 |
Drives: 2010 camaro ss Join Date: Sep 2018
Location: new york
Posts: 156
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from a not 1/4 mile perspective, just a street car would gears still be a good upgrade?
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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 |
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11-21-2018, 12:04 PM | #13 |
Drives: 2010 SS L99 Join Date: Sep 2018
Location: Missouri
Posts: 1,634
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You'll like how much lighter the car feels
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Previous PB:11.079 @ 122.99mph.. New setup time: TBD
The 11.079 pass: https://youtu.be/pz27Zq54t_E Build thread - www.camaro5.com/forums/showthread.php?t=555371 |
11-21-2018, 12:38 PM | #14 |
GPI Sales Consultant
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Absolutely! If you're gonna do the upgrade, take it all the way!
__________________
GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph.
Got a question about a GPI product? Feel free to shoot me a message! |
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