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03-12-2018, 07:04 PM
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#1 |
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USA-1
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Why aren't 3.45 gears worth it in a L99?
Hey all,
So I have a L99 that I want to give some more 'oomph', but the 3.91's just don't appear to be what I want right now. Reasons are, I do quite a bit of highway driving and I don't want to kill my highway mileage. Also, to get the 3.91's it will probably run me $1k or so. Now, I've heard people saying the 3.45's aren't worth it, but I figure if the 3.91's give a 20% increase, shouldn't the 3.45's give like a 5%? If 5% of 400 is 20, isn't 20 not bad? I can probably source a 3.45 differential for $500 or so, and maybe sell my 3.27 for 1-200ish (i'm guessing). Can someone tell me why this doesn't make sense? Oh, and I'll probably be throwing in a 3200 or 3600 converter at some point soon.
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"A Camaro in the garage is safe, but that's not what Camaros are built for..."
R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete |
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03-12-2018, 07:09 PM
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#2 |
     
Drives: 2010 Camaro 2ss/Rs Transformers Join Date: Aug 2014
Location: Yorba Linda, California
Posts: 1,564
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I just say go with the GM oem 3.91 gears. Oem quality. Big difference compared to stock and I also have a muti disk 3600-3700 circle D stall. I love it. I’m not sure how the 3.45’s would be. You’re gonna need to recalibrate the car for the new gears too
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YouTube:Krisprz garage
Insta:kris__perez & krisprz_garage LS3 conversion Vararam intake(tune model) Kooks LT headers & cats delete Corsa ZL1 3" exhaust RedBarn Racing Tune CMS Stage 3 Cam AFR CNC ported heads MSD Spark plug wires LNC-2000 Launch controller NGK TR6 Spark Plugs 1le strut tower brace-TPIS spacers Nick Williams 102mm throttle body Fast lsxr 102 intake manifold Slp 25% UDP Katech Tensioner Pulley Circle D 3600-3700 multi disk Stall GM 3.91 gears DDS carbon fiber driveshaft ZL1 fuel pump & injectors Flex fuel sensor(91/E85) https://wheelwell.com/kris-perez |
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03-12-2018, 07:39 PM
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#3 |
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'It's an experiment'
Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014
Location: Dallas TX
Posts: 8,695
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3.91s if staying Bolton’s or NA. I had them and they worked great. Once I went FI, 3.45 or stay stock IF going crazy power..
-Don
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747 RWHP 794 RWTQ
"Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577 |
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03-12-2018, 07:39 PM
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#4 |
Drives: 2015 camaro 2lt Join Date: Dec 2016
Location: Northern West Virginia
Posts: 925
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how do taller gears help?
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Cosmetic mods: SS hood with painted vent, SS bumper, acs 1le front lip black, big worm gfx tinted all lights, solar wing v2, Camaro seat belt pads and oracle color shift halos and fog light halos and rear colorshift bow tie, carbon creations carbon fiber stingray z spoiler
Wheels: lexani r-3 bg finish 19x8.5 Performance: cold air inductions intake, mrt v1, jacfab ported intake manifold, intake manifold spacer, overkill tuned on E85. |
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03-12-2018, 08:03 PM
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#5 |
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USA-1
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From what I've heard, 'it feels like the car lost 1000 pounds'.
Thanks for the help guys, as I mentioned, I don't want to take a big hit on the MPG since having 3.91s and the higher stall will hurt. I'm also trying to avoid having to buy bigger/wider tires! 
__________________
"A Camaro in the garage is safe, but that's not what Camaros are built for..."
R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete |
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03-12-2018, 09:06 PM
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#6 |
   
Drives: 2010 SS 2SS M6 Join Date: Aug 2016
Location: Smithsburg, Md.
Posts: 2,445
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my 3.45 R/P just sittin in my garage...
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2010 SS 2SS M6 - Tune by RDP dynoSteve!(Woot) - Daily Driver - 150K! - All work by me...
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03-12-2018, 10:26 PM
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#7 |
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Angewendet Ingenieur
Drives: 14 Camaro ZL1 Join Date: Apr 2015
Location: USA
Posts: 401
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Your concerns and the Math consider;
1. First gear ratio of the automatic 2. Fuel economy 3. High stall converter 4. Tire size used in daily driving (perhaps a smaller track tire?) 5. A lot of highway driving 6. Power output of the engine 7. Track or drag (occasional or often) You should be able to make an informed decision. I would only add a posi unit such as true trac. I am absolutely happy with my selection.
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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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03-13-2018, 12:53 AM
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#8 |
   
Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,020
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Going from 3.27 to 3.45 is not even a 1/4 ratio gain. Not worth it
__________________
Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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03-13-2018, 01:52 AM
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#9 | |
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Drives: 2010 Camaro 2ss/Rs Transformers Join Date: Aug 2014
Location: Yorba Linda, California
Posts: 1,564
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Quote:
That’s what I was thinking. Maybe 3.73s instead?
__________________
YouTube:Krisprz garage
Insta:kris__perez & krisprz_garage LS3 conversion Vararam intake(tune model) Kooks LT headers & cats delete Corsa ZL1 3" exhaust RedBarn Racing Tune CMS Stage 3 Cam AFR CNC ported heads MSD Spark plug wires LNC-2000 Launch controller NGK TR6 Spark Plugs 1le strut tower brace-TPIS spacers Nick Williams 102mm throttle body Fast lsxr 102 intake manifold Slp 25% UDP Katech Tensioner Pulley Circle D 3600-3700 multi disk Stall GM 3.91 gears DDS carbon fiber driveshaft ZL1 fuel pump & injectors Flex fuel sensor(91/E85) https://wheelwell.com/kris-perez |
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03-13-2018, 05:09 AM
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#10 |
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Angewendet Ingenieur
Drives: 14 Camaro ZL1 Join Date: Apr 2015
Location: USA
Posts: 401
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The concern is having a useable first gear 4.03 which is different from 3.01 and throw in a torque converter; Can it reasonably hook up? Again goes back to the original question “primary objective”, everything has a cost....
__________________
————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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03-13-2018, 07:33 AM
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#11 |
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USA-1
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Ya, I was reading Pro Stock Johns comments on another thread and he said he had bolt-ons, added the CD 3200 converter and he was having issues hooking. I honestly drive pretty normal, and every now and then get on it, so I'm not looking for a strip-only setup.
__________________
"A Camaro in the garage is safe, but that's not what Camaros are built for..."
R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete |
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03-13-2018, 07:48 AM
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#12 |
 
Drives: 2011 ss 2ss auto camaro Join Date: Mar 2015
Location: mary esther florida
Posts: 385
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I have a 4000 stall with 3.91 and was doing 1.60 60s on a 285/40/18 et streeet s/s now I’m back to a 305/45/18 nitto nt05r. When I had the 285/40/18 my ratio was 4.15 I was doing 70mph at 2500ish rpm now I’m at like 2100ish and I still get 23 on the highway
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2011 2ss white Camaro mods are texas speed stage 4 cam 235/239 Texas speed 2inch headers no cats magna flow bullet mufflers gpi rod mod ,circle d 4000-4200 5c stall. 3.91 gears vararm cai power wedge.
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03-13-2018, 08:44 AM
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#13 |
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Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,020
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Fast list guys run 3.91s
Don't see any 3.45 or 3.73 gears in those cars.
__________________
Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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03-13-2018, 09:02 AM
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#14 |
 Drives: 2011 1ss Join Date: Jun 2017
Location: Baton Rouge
Posts: 181
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I'll be putting in some 3.91s soon! Just got em in yesterday
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