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

Ice Demon · 01-21-2013, 11:42 AM

Alright so my buddy just swapped out his 3.45 rear end in his LS3 and put the 1LE rear end in with 3.91. My question is since he has the entire rear end with 3.45's in it would it be worth it to swap my 3.25 (L99) for a 3.45 rear end. Would I see any noticeable difference in track times or would it not be worth doing? And my track times I mean 1/4. Btw my car is a auto L99

SC2150 · 01-21-2013, 03:07 PM

Yes, do it. Just need to flash in the ratio change for the speedo.

You will love it.

(then PM us and we will buy your 3.25 unit to put 3.91's in).

Ice Demon · 01-22-2013, 01:07 AM

Alright thx. I will definitely send u a pm about my 3.25's . Any idea what I can expect to gain as far as better ET's and trap speeds?

flht99b · 01-22-2013, 08:13 AM

I went from 3.45's to 3.70's in my LS3 SS and it was perfect, just that small ratio change made a world of difference. A change from 3.27's to 3.45's in an auto L99 would be a similar jump. You will need a tune for the speedo and odometer as stated in an above post.
Ed M.

Ice Demon · 01-22-2013, 09:42 AM

Quote:

Originally Posted by flht99b

I went from 3.45's to 3.70's in my LS3 SS and it was perfect, just that small ratio change made a world of difference. A change from 3.27's to 3.45's in an auto L99 would be a similar jump. You will need a tune for the speedo and odometer as stated in an above post.
Ed M.

Alright I was just worried that the 3.25 to 3.45 would not make that big of a difference but it sounds like it will make a big difference. I am aware that I will need to have my tuner take care of the speedo and odometer.

Motion427 · 01-22-2013, 01:46 PM

I just did mine today. From 3.27 to 3.45
Can't try it though.... due to weather.

Ice Demon · 01-22-2013, 01:51 PM

Quote:

Originally Posted by Motion427

I just did mine today. From 3.27 to 3.45
Can't try it though.... due to weather.

Nice, well whenever the weather improves and you can take it for a spin yet me know what you think..

SC2150 · 01-22-2013, 02:39 PM

With the A6 trans the jump is pretty ideal. Expect as much as .5-1 tenth gain in the 1/4 mile.

ZOOK · 01-23-2013, 07:32 PM

flht99b

I went from 3.45's to 3.70's in my LS3 SS and it was perfect, just that small ratio change made a world of difference. A change from 3.27's to 3.45's in an auto L99 would be a similar jump. You will need a tune for the speedo and odometer as stated in an above post.
Ed M.
---------------------------------------------------------------------
Ed M

I ordered my 3.70 with the eaton trutrack from jre plus extras.

tell us more about what you like

ZOOK · 01-23-2013, 07:35 PM

Motion427

Is it hard to traction at -30 c ??

Motion427 · 01-23-2013, 07:48 PM

New product
20x11 wheels with 315/35/20 studded tires for maximum winter traction.
lol.........

-30 c = -22 F
It's been a cold week for sure..........

STSL · 01-23-2013, 08:10 PM

I swaped my wifes and it really woke the car up,i had a tune at the same time but i really like it.

*mlee* · 01-23-2013, 09:01 PM

Quote:

Originally Posted by Street Slayer

I swaped my wifes and it really woke the car up,i had a tune at the same time but i really like it.

Nice to see Hendrix is back.

flht99b · 01-25-2013, 10:39 AM

Quote:

Originally Posted by ZOOK

flht99b

I went from 3.45's to 3.70's in my LS3 SS and it was perfect, just that small ratio change made a world of difference. A change from 3.27's to 3.45's in an auto L99 would be a similar jump. You will need a tune for the speedo and odometer as stated in an above post.
Ed M.
---------------------------------------------------------------------
Ed M

I ordered my 3.70 with the eaton trutrack from jre plus extras.

tell us more about what you like

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.

01-21-2013, 11:42 AM	#1
Ice Demon Drives: 2010 Camaro SS Join Date: Oct 2011 Location: Memphis, TN Posts: 1,098 View My Garage	3.25 to 3.45 Gears Alright so my buddy just swapped out his 3.45 rear end in his LS3 and put the 1LE rear end in with 3.91. My question is since he has the entire rear end with 3.45's in it would it be worth it to swap my 3.25 (L99) for a 3.45 rear end. Would I see any noticeable difference in track times or would it not be worth doing? And my track times I mean 1/4. Btw my car is a auto L99 __________________ Mods: "Cam Only" Last edited by Ice Demon; 01-21-2013 at 11:57 AM.

01-22-2013, 01:07 AM	#3
Ice Demon Drives: 2010 Camaro SS Join Date: Oct 2011 Location: Memphis, TN Posts: 1,098 View My Garage	Alright thx. I will definitely send u a pm about my 3.25's . Any idea what I can expect to gain as far as better ET's and trap speeds? __________________ Mods: "Cam Only"

01-22-2013, 08:13 AM	#4
flht99b Drives: 2010 Camaro 2SS/RS RJT Join Date: May 2009 Location: Knoxville Posts: 1,574 View My Garage	I went from 3.45's to 3.70's in my LS3 SS and it was perfect, just that small ratio change made a world of difference. A change from 3.27's to 3.45's in an auto L99 would be a similar jump. You will need a tune for the speedo and odometer as stated in an above post. Ed M. __________________ RJT 2SS/RS, AAM 3.70's, MTI Sway Bars, Shifter & SS brake lines, ZLI calipers, rotors & pads, BMR Trailing & Toe Arms, rear cradle & diff bushes, Pedders XA's, Camber/Toe eccentrics, Radius arm inserts, GTO clutch reservoir, LS9 cam, Comp valve springs, Melling 10296 oil pump, CR5 timing chain, LS6 damper, CAI Cold Air Intake, ARH LT headers w/HF cats, GMPP touring axle back, Elite Engineering Catch Can, Forgeline 20x9.5 & 20x11 DS3 whls, 275/40/20 & 315/35/20 tires, 2011 Convertible spoiler, 1LE front spoiler, Lloyd "SS" Floor Mats, GM Camaro Trunk Mat, wrapped console & Grant steering wheel.

01-23-2013, 07:32 PM	#9
ZOOK Drives: 2010 2ss 6 speed Join Date: Apr 2011 Location: NEW BRUNSWICK CANADA Posts: 328	3.70 flht99b I went from 3.45's to 3.70's in my LS3 SS and it was perfect, just that small ratio change made a world of difference. A change from 3.27's to 3.45's in an auto L99 would be a similar jump. You will need a tune for the speedo and odometer as stated in an above post. Ed M. --------------------------------------------------------------------- Ed M I ordered my 3.70 with the eaton trutrack from jre plus extras. tell us more about what you like

01-23-2013, 07:35 PM	#10
ZOOK Drives: 2010 2ss 6 speed Join Date: Apr 2011 Location: NEW BRUNSWICK CANADA Posts: 328	Motion427 Motion427 Is it hard to traction at -30 c ??

01-21-2013, 03:07 PM	#2
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 6,063	Yes, do it. Just need to flash in the ratio change for the speedo. You will love it. (then PM us and we will buy your 3.25 unit to put 3.91's in).

01-22-2013, 01:46 PM	#6
Motion427 Account Suspended Drives: 2010 2SS/RS Red Jewel L99 Join Date: Jun 2011 Location: NB,Canada Posts: 834	I just did mine today. From 3.27 to 3.45 Can't try it though.... due to weather.

01-22-2013, 02:39 PM	#8
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 6,063	With the A6 trans the jump is pretty ideal. Expect as much as .5-1 tenth gain in the 1/4 mile.

01-23-2013, 07:48 PM	#11
Motion427 Account Suspended Drives: 2010 2SS/RS Red Jewel L99 Join Date: Jun 2011 Location: NB,Canada Posts: 834	New product 20x11 wheels with 315/35/20 studded tires for maximum winter traction. lol......... -30 c = -22 F It's been a cold week for sure..........

01-23-2013, 08:10 PM	#12
STSL Account Suspended Drives: 2010 ZR1 Camaro Join Date: Dec 2012 Location: Everywhere, USA Posts: 163	I swaped my wifes and it really woke the car up,i had a tune at the same time but i really like it.