Any gains from a gear change?

Katfish · May 3rd, 2011, 05:38 PM

I'm pretty sure there will be some improvement, but how much?
I went from the stock 3.31's to 3.73s.

It's a 06 GT with a JLT CAI and Bama tune, I ran 13.7 with the 3.31s.

Funny story, I went to the local Dyno shop, nice guy and seemed very knowledgable, but he said "don't expect much improvement from the gears, remember they don't change the HP"

I understand it's his business to sell mods (and Dyno time) that increase HP, but I was surprised he said this several times?

So what can I expect, 13.50s?

Cobraman1024 · May 3rd, 2011, 05:52 PM

you probably would notice more of a seat of the pants change if you installed 4.10s or 4.30s.
13.5 seems about right.......you'll get a little lower with some drag radials on lightweight rims.

Bullitt5339 · May 3rd, 2011, 06:42 PM

I went from 13.3 to 12.9 with the installation of my 4.10's.

Katfish · May 3rd, 2011, 08:49 PM

Nice, what did you change from?

I actually can't tell much difference with just normal around town driving, hope it makes a difference at the track.

Scott2001GT · May 4th, 2011, 01:32 AM

14.3 to 13.8 with 4:10s, o/r midpipe and SCT handheld..auto

Bullitt5339 · May 4th, 2011, 07:45 AM

Originally Posted by Katfish

Nice, what did you change from?

I actually can't tell much difference with just normal around town driving, hope it makes a difference at the track.

I swapped from 3.27's to the 4.10's. The major difference for me driving around town was the fact that I could run 4th and 5th gear all the time, instead of constantly shifting.

andrewskaggs · May 4th, 2011, 09:31 AM

When I went to 3.73s, I also upgraded to a 31-spline rear. The gears plus launching harder (3800 on stock rear end to 4800 now) took me from 8.59 to 8.32 in the 1/8 mile.

Katfish · May 4th, 2011, 09:21 PM

Well, I guess I'll see what the result is within a month when I can get back over to the track. I'm running the car after each mod so I can tell what the effect is.

Bone stock (3.31 gears) - 14.2
CAI & Tune (3.31 gears) - 13.8
3.73 gears - ???

BaznastyDave · May 5th, 2011, 02:59 PM

I know some of the 05-09 guys cross the traps in the top of 3rd and when some of them switch gears they have to shift into 4th which makes their times the same or even slower.

dcook_14 · May 5th, 2011, 03:53 PM

With my car, stock gears, and a 27" tire I cross the traps right at the top of 3rd. It's ridiculous and I need to get some 3.73s asap

May 3rd, 2011, 05:38 PM	#1
Katfish Regular 2006 GT 13.75@102 Join Date: Feb 2011 Location: Central FL Posts: 154 iTrader: 0 reviews	Any gains from a gear change? I'm pretty sure there will be some improvement, but how much? I went from the stock 3.31's to 3.73s. It's a 06 GT with a JLT CAI and Bama tune, I ran 13.7 with the 3.31s. Funny story, I went to the local Dyno shop, nice guy and seemed very knowledgable, but he said "don't expect much improvement from the gears, remember they don't change the HP" I understand it's his business to sell mods (and Dyno time) that increase HP, but I was surprised he said this several times? So what can I expect, 13.50s?

May 3rd, 2011, 05:52 PM	#2
Cobraman1024 Enthusiast 1995 SVT Cobra Join Date: Nov 2010 Location: Fall River, MA and Juffair, Bahrain Posts: 780 iTrader: 0 reviews	you probably would notice more of a seat of the pants change if you installed 4.10s or 4.30s. 13.5 seems about right.......you'll get a little lower with some drag radials on lightweight rims. __________________ 1995 SVT Cobra #182/4005, 275/305, 217k miles 1996 SVT Mystic Cobra #1666/2000, 267/263, 178k miles 1995 Mustang, 3.8L, 233k miles 1993 Mustang LX, 2.3L, T5 convert, 95 GT suspension swap, 03 Cobra steering rack, 250k miles sold: 1987 GT MM Military Crew Member MM+Cleavage member #21

May 3rd, 2011, 06:42 PM	#3
Bullitt5339 Hardcore Enthusiast 2001 Bullitt 12.25@110.4 Join Date: Mar 2010 Location: North Carolina Posts: 2,599 iTrader: 1 reviews	I went from 13.3 to 12.9 with the installation of my 4.10's. __________________ Bolt-On Bullitt... Unmodified longblock, stock intake and throttle body. 266rwhp/306rwtq 12.25@110.4 1.64 60ft Currently Under Reconstruction

May 4th, 2011, 01:32 AM	#5
Scott2001GT BYAHHHH! 2001 Mustang GT 13.874 Join Date: Mar 2008 Location: Missouri Posts: 14,804 Blog Entries: 1 iTrader: 3 reviews	14.3 to 13.8 with 4:10s, o/r midpipe and SCT handheld..auto __________________ Precision Turbo\|TurboSmart\|TeamZ\|Strange\|Hellion\|BBK\|SCT\|Edge Converters\|Fairbanks\|CG Fabrications\|Treadstone

May 4th, 2011, 09:31 AM	#7
andrewskaggs Hardcore Enthusiast 2003 Mustang GT 8.26@83.06 (1/8) Join Date: Apr 2010 Location: Henderson, TN Posts: 1,104 iTrader: 4 reviews	When I went to 3.73s, I also upgraded to a 31-spline rear. The gears plus launching harder (3800 on stock rear end to 4800 now) took me from 8.59 to 8.32 in the 1/8 mile. __________________ SLP :: SCT :: Eaton :: Maximum Motorsports :: Baseline Suspensions :: Strange Engineering MM Bracket Racing Crew BAMA Performance Drag Team #1 Project Thread :: YouTube Channel

May 3rd, 2011, 08:49 PM	#4
Katfish Regular 2006 GT 13.75@102 Join Date: Feb 2011 Location: Central FL Posts: 154 iTrader: 0 reviews	Nice, what did you change from? I actually can't tell much difference with just normal around town driving, hope it makes a difference at the track.

May 4th, 2011, 09:21 PM	#8
Katfish Regular 2006 GT 13.75@102 Join Date: Feb 2011 Location: Central FL Posts: 154 iTrader: 0 reviews	Well, I guess I'll see what the result is within a month when I can get back over to the track. I'm running the car after each mod so I can tell what the effect is. Bone stock (3.31 gears) - 14.2 CAI & Tune (3.31 gears) - 13.8 3.73 gears - ???

May 5th, 2011, 02:59 PM	#9
BaznastyDave MM Fanatic 2004 Mustang Join Date: May 2010 Location: NC Posts: 4,339 iTrader: 4 reviews	I know some of the 05-09 guys cross the traps in the top of 3rd and when some of them switch gears they have to shift into 4th which makes their times the same or even slower. __________________ 305/333 WHP/WTQ with CMS Stage II cams 440/552 WHP/WTQ on Spray 7.86 @ 89.1mph, 1.61 60 foot N/A 7.20 @ 98.8MPH 1.55 60 foot on spray Stock Longblock with Cams

May 5th, 2011, 03:53 PM	#10
dcook_14 Banned 2004 Mustang GT 12.35@114.08 w/ 1.88 60' Join Date: Feb 2009 Location: Waterloo, IA Posts: 7,015 Blog Entries: 2 iTrader: 7 reviews	With my car, stock gears, and a 27" tire I cross the traps right at the top of 3rd. It's ridiculous and I need to get some 3.73s asap __________________ Do the Right Thing, Cook. ~Zip.

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