3.25 to 3.45 Gears - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ZOOK · 01-25-2013, 09:50 PM

With the mods that i am doing this winter the gear change was one that i wanted to make the right call .

Thanks for the feedback

SC2150 · 01-26-2013, 10:44 AM

Quote:

Originally Posted by flht99b

The LS3 cars should have came with 3.70's from the factory as well as the L99 cars should have come with 3.45's from the factory, IMHO. Guess the EPA fuel numbers might have caused a gas guzzler tax with the increased gear. The seemingly small ratio change makes 6th ( manual ) so much more usable, there is a definite increase in acceleration in all gears ( very noticeable on the road course ), with stock diameter tires 80mph is 2,000 rpm so the car still gets great fuel economy on the road and isn't loud due to engine rpm. With my mild engine mods and 3.70 gears I still get 24.6 mpg on the highway. I'm sure the 3.91's are great also although they might shorten up 1st a bit too much for my taste. Even though the 3.91's weren't out when I installed the 3.70's, if I had it to do all over again I'd still take the 3.70's.
Ed M.

I agree.

Also, anyone wanting we have Diffs in stock complete.

NateSS · 01-26-2013, 04:00 PM

I'm going to end up doing the same thing.
I dont want to go to aggressive so just the jump up to 3.45 will be enough for me

SGOS252382 · 01-26-2013, 05:43 PM

Padre swapped his stock gears for LS3, 3:45s. He also documented his track times.
He said the gears made daily driving better (especially once he got his cam), but he didn't see much of any gain at the track.
12.06 @ 114.0 mph - stock gears
12.02 @ 113.9 mph - 3:45 gears
Both times corrected for DA for comparison.

So don't expect much improvement at the track with them.

Ice Demon · 01-26-2013, 05:57 PM

Quote:

Originally Posted by SGOS252382

Padre swapped his stock gears for LS3, 3:45s. He also documented his track times.
He said the gears made daily driving better (especially once he got his cam), but he didn't see much of any gain at the track.
12.06 @ 114.0 mph - stock gears
12.02 @ 113.9 mph - 3:45 gears
Both times corrected for DA for comparison.

So don't expect much improvement at the track with them.

That's depressing lol I was hoping for atleast .3 difference. Could you post a link so I can view that thread.

*mlee* · 01-26-2013, 06:18 PM

Quote:

Originally Posted by Ice Demon

That's depressing lol I was hoping for atleast .3 difference. Could you post a link so I can view that thread.

http://www.camaro5.com/forums/showthread.php?t=128997

Supercharged SS · 01-26-2013, 06:20 PM

When we experimented with gears at the track the 3.45's allowed the car to be in 4th longer, at higher rpms, resulting in higher trap speeds and lower ET's.

Ice Demon · 01-26-2013, 06:45 PM

So it basically seems that if you are looking to improve et's then 3.25 to 3.45 are a waste of $. So I guess I am back to looking at LPE 3.70 gears. I have considered 3.91 but I think they might be to much gear for my auto especially with the insane 1st gear. I would definitely need slicks to get it to hook. I doubt my nt05r could hook. Also with the 3.91 I'm afraid it would shift right before the traps. Are my assumptions about the 3.91's correct?

Supercharged SS · 01-26-2013, 06:48 PM

Quote:

Originally Posted by Ice Demon

So it basically seems that if you are looking to improve et's then 3.25 to 3.45 are a waste of $. So I guess I am back to looking at LPE 3.70 gears. I have considered 3.91 but I think they might be to much gear for my auto especially with the insane 1st gear. I would definitely need slicks to get it to hook. I doubt my nt05r could hook. Also with the 3.91 I'm afraid it would shift right before the traps. Are my assumptions about the 3.91's correct?

No it's not a waste. There's a reason all the fast cars are running the 3.45's.

More than likely the 3.91 will be to much gear. What's the rwhp of the car?

Ice Demon · 01-26-2013, 06:59 PM

Quote:

Originally Posted by Supercharged SS

No it's not a waste. There's a reason all the fast cars are running the 3.45's.

More than likely the 3.91 will be to much gear. What's the rwhp of the car?

Right now my car just has bolt ons 371rwhp 387rwtq. I also have a stall going in soon.

And I will be going FI in the future.

inferno camaro · 01-26-2013, 07:02 PM

FI= 3.45 in most cases it seems.

Supercharged SS · 01-26-2013, 07:03 PM

Quote:

Originally Posted by Ice Demon

Right now my car just has bolt ons 371rwhp 387rwtq. I also have a stall going in soon.

And I will be going FI in the future.

I'd put the 3.45's and be done with it. You could get away with a 3.91 now but once you go FI forget about that. All you'll do is blow the tires off and cross in 5th.

Ice Demon · 01-26-2013, 07:10 PM

Quote:

Originally Posted by Supercharged SS

I'd put the 3.45's and be done with it. You could get away with a 3.91 now but once you go FI forget about that. All you'll do is blow the tires off and cross in 5th.

Alright so 3.45 will yield minimum gains now but later on it will come into play when I go FI. Yea that's what I thought about the 3.91. Thanks all for the your advice

Motion427 · 01-26-2013, 07:15 PM

If you would have 3.91's and your trap speed would be 120mph. The rpm's would be 6500.

01-25-2013, 09:50 PM	#15
ZOOK Drives: 2010 2ss 6 speed Join Date: Apr 2011 Location: NEW BRUNSWICK CANADA Posts: 328	gears With the mods that i am doing this winter the gear change was one that i wanted to make the right call . Thanks for the feedback

01-26-2013, 04:00 PM	#17
NateSS 1337 AH64D driver Drives: 2010 Camaro 2SS/RS L99 Join Date: Sep 2010 Location: Houston, TX Posts: 254	I'm going to end up doing the same thing. I dont want to go to aggressive so just the jump up to 3.45 will be enough for me __________________ Cam/Heads by ARD, Tune by G-Force, Transmission/Gears by Circle D

01-26-2013, 06:45 PM	#22
Ice Demon Drives: 2010 Camaro SS Join Date: Oct 2011 Location: Memphis, TN Posts: 1,098 View My Garage	So it basically seems that if you are looking to improve et's then 3.25 to 3.45 are a waste of $. So I guess I am back to looking at LPE 3.70 gears. I have considered 3.91 but I think they might be to much gear for my auto especially with the insane 1st gear. I would definitely need slicks to get it to hook. I doubt my nt05r could hook. Also with the 3.91 I'm afraid it would shift right before the traps. Are my assumptions about the 3.91's correct? __________________ Mods: "Cam Only"

01-26-2013, 07:02 PM	#25
inferno camaro Drives: 2010 camaro pace car, 2008 cts bl, Join Date: Jun 2011 Location: Indiana Posts: 841	FI= 3.45 in most cases it seems. __________________ Mods, 2r max cam, ls3 conv,kooks lt w/hf cats,kooks street sleeper cat back with magnaflow res x-pipe, roto fab cai, v-max TB, vigilante 3700 stall, 3.70 LPE, 442hp/392tq, Mike Norris Tune 11.71@116.24 1.63 60' m&h DR's

01-26-2013, 05:43 PM	#18
SGOS252382 Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008 Location: S.W. Florida Posts: 6,294	Padre swapped his stock gears for LS3, 3:45s. He also documented his track times. He said the gears made daily driving better (especially once he got his cam), but he didn't see much of any gain at the track. 12.06 @ 114.0 mph - stock gears 12.02 @ 113.9 mph - 3:45 gears Both times corrected for DA for comparison. So don't expect much improvement at the track with them.

01-26-2013, 06:20 PM	#21
Supercharged SS Account Suspended Drives: 2010 Camaro Join Date: Feb 2010 Location: Sandy Hook, CT Posts: 11,927	When we experimented with gears at the track the 3.45's allowed the car to be in 4th longer, at higher rpms, resulting in higher trap speeds and lower ET's.

01-26-2013, 07:15 PM	#28
Motion427 Account Suspended Drives: 2010 2SS/RS Red Jewel L99 Join Date: Jun 2011 Location: NB,Canada Posts: 834	If you would have 3.91's and your trap speed would be 120mph. The rpm's would be 6500.