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Old 02-25-2014, 06:34 AM   #15
Apex Motorsports
 
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Quote:
Originally Posted by Padre View Post
Consensus is that 3.73 is best for an L99 bolt-on car. First gear in an auto is pretty short, which would make it mostly useless with 3.91's (spin).

If you ever plan to used forced induction, then go with 3.45's.

Padre
This pretty well nails it.
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Old 02-25-2014, 09:50 AM   #16
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Shady, I think moving to 3.91's bump the rpms in every gear a noticeable amount, Jbrown and some others posted some info another thread (thanks again guys).

I'm not sure if Speed Inc. does gear swaps but you could ask them and they are a sponsor on here too. tom@speedinc.com
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PROJECT HEAVY CHEVY
Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune
12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
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Old 02-28-2014, 01:53 PM   #17
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I have a L99 whippled with LT headers and a 2800 stall daily driver that occasionally goes down the strip. What gears do you recommend?
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Old 03-10-2014, 01:50 PM   #18
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3.45's

OK, where can I find 3.45 gears for My Supercharged L99
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2011 Victory Red 2SS/RS
630hp. and 550ft. lbs.
Black Rally Stripes
6 Speed Automatic
Whipple 2.9L
LS3 Conversion
ARH LT Headers and X-Pipe
GMMP Axle Backs
Yank 2800 Stall
RotoFab CAI
RX Performance Catch Can
VMAX Ported Throttle Body
Built by C.B.I. Streetcars
Tuned By DSX Tuning
GM Quarter Flares
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Old 07-24-2014, 02:05 AM   #19
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I'm not an experienced drag racer, having taken it up at 67 years of age, so my numbers may not be indicative of what can be had. My PB to date has been 11.362 - 1/4 and 1.623 - 60'. My tuner thinks I should be able to get into the 1.5x - 60', but I haven't been able to accomplish that yet.
Howdy fellow geezer. I'm soon to turn 60 years of age, but have HUNDREDS of passes at the dragstrip and on the street. I've run both 1/4 mile tracks (Texas Motorplex and Green Valley Raceway) and a 1/8 mile track (Kennedale Raceway).

If you ever have a question or seek to understand something about drag racing and the various things about it, please do not hesitate to PM me. I should be able to answer most any racing related question. If I cannot answer a question, I know whom I should ask.

At one time I had my NHRA license to run a full bodied car to 7.99. A friend let me borrow his car to make al the runs to get licensed. I never had the money to build a car quicker than my homebuilt small block 9 second 1962 Chevy II.

Have fun and be safe!
Remember: It's better to abort a run than have an unfriendly meeting with the retaining wall...or worse, your competitors car.
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Old 07-24-2014, 02:09 AM   #20
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Originally Posted by FRANK121 View Post
OK, where can I find 3.45 gears for My Supercharged L99
An M6 differential would be just the ticket running 540 LB/FT of torque. The guys going way up the torque values are the ones having to upgrade. Keep an eye on the classifieds.

If I was not having to save property tax money, I'd sell you my gears. I've only got 1500 miles on the clock. Too bad I cannot afford to buy and have installed, the 3.73s I'd like to have
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Old 07-24-2014, 09:05 AM   #21
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I did 3.91's. I don't think I'd do them if I had a supercharger.

But I plan to do heads and cam.
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PROJECT HEAVY CHEVY
Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune
12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
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Old 07-24-2014, 09:42 AM   #22
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Originally Posted by Pro Stock John View Post
I did 3.91's. I don't think I'd do them if I had a supercharger.

But I plan to do heads and cam.
Same here in my L99 -- I'm doing similar mods Pro Stock John is doing -- no FI in my plans either.

-Don
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Old 07-24-2014, 12:27 PM   #23
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If I was going the power adder route, I would not do gears until later.
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PROJECT HEAVY CHEVY
Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune
12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
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Old 08-30-2019, 12:11 AM   #24
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Quote:
Originally Posted by Pro Stock John View Post
Shady, I think moving to 3.91's bump the rpms in every gear a noticeable amount, Jbrown and some others posted some info another thread (thanks again guys).

I'm not sure if Speed Inc. does gear swaps but you could ask them and they are a sponsor on here too. tom@speedinc.com
Can you daily drive 3.91 and how is it on the freeway
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Old 09-09-2019, 10:05 PM   #25
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I did 410s and so far and love them, but did clutch at same the same time so cant really get after yet (break of clutch 500 miles). I'm just basic bolt ons and cammed (.236/.242) and don't plan on FI, if so I'll probably regret the 410s and have to down size..
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Old 09-10-2019, 02:31 PM   #26
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Originally Posted by Gofastson View Post
Can you daily drive 3.91 and how is it on the freeway
Yes, I do, and it's about 2200 rpms at 70. car is beast from a roll too, but she is a heavy drinker.
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PROJECT HEAVY CHEVY
Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune
12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
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Old 09-16-2019, 01:48 PM   #27
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Weekend Warrior

Have a 2010 SS Automatic that I drive only on weekends granted weather is good (no rain); Burnt rear up at track, so time to do new locker and gear; what would be the disadvantage of the 3.91? Not worried about fuel mileage, Trans is already turned for shift points along with car. I don't see 150rpms being a big deal!! Help an old circle tracker out... LOL
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Old 09-30-2019, 12:51 PM   #28
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Thumbs up NEW GEARS

Had the 3.91's installed Friday nite, drove the car Saturday and love the gears. Now just to get the tranny set right (@67 I'm doing 55), Hit the interstate and doing 70-75; rpm's where around 2100 (give or take); gas mileage went down some, but I didn't buy the car to save money on gas..
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