new gears for automatic?

silver04GTstang

New Member

Jan 16, 2007

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Jan 16, 2007

#1

• Jan 16, 2007

• #1

i am going to put new gears in my automatic and i was wondering what gear everyone thought was best as far as all around gear and what gas mileage was after gears. i was thinking 3.73 or 3.55 what should i get?

 

Duke309

Member

Oct 15, 2005

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Orlando, FL

Jan 16, 2007

#2

• Jan 16, 2007

• #2

3.73s atleast, my buddy has the j-mod, 373s and an xcal2 and I still think he should have gone with 4.10s.

Dont get 3.55s, they arent a big enough difference.

 

LaserRed01GT

Banned

Oct 3, 2006

739

3

0

Clearwater, FL

Jan 16, 2007

#3

• Jan 16, 2007

• #3

For an auto, a 3.90:1 is a nice compromise between performance and fuel mileage.

You should still be able to get around 21-23 MPG with your auto and 3.90's on the highway.

 

T

TGJ

New Member

Mar 30, 2005

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Jan 16, 2007

#4

• Jan 16, 2007

• #4

26 MPG on the HWY with 4.30's in my 96 TBird. Having had 3.27's( Stock ), 3.55's, 3.73 and 4.30's, in that car, my suggestion is nothing less than 4.10's.

 

0

007

Founding Member

Jan 29, 2002

3,287

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Broke

Jan 17, 2007

#5

• Jan 17, 2007

• #5

4.10s. I would be PISSED if id gone with anything less.

 

twogts4us

15 Year Member

Apr 1, 2004

4,188

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79

Dunedin, FL

Jan 17, 2007

#6

• Jan 17, 2007

• #6

4.10 or 4.30 - or you'll be disappointed

 

03ghoststang

Well-Known Member

Jul 16, 2005

1,930

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Los Angeles, California

Jan 17, 2007

#7

• Jan 17, 2007

• #7

4.10's and nothing less

 

04YELLOWGT

Active Member

Jun 29, 2005

1,135

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39

Indiana

Jan 17, 2007

#8

• Jan 17, 2007

• #8

4.10s for sure. I never really noticed a mpg difference when I installed them. I guess my first tank with them did but thats because I went WOT so many times. lol Other thatn the blower this is the biggest difference I could feel.

 

R

Rocketman

New Member

Apr 20, 2004

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SoCal

Jan 17, 2007

#9

• Jan 17, 2007

• #9

4.10's, no less in an auto.

4.10's cruising on the frwy in overdrive. 03 GT automatic.

 

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AmBo

Active Member

Feb 3, 2004

1,027

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New Jersey

Jan 17, 2007

#10

• Jan 17, 2007

• #10

Omgosh 2,700rpms @ 70mph would make me go insane. However, with an automatic, you need to go with 4.10s. ESPECIALLY if you are going to stay n/a. I love my 3.73s though...but love the blower more.

 

joshheat25

Member

Nov 8, 2004

871

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Delaware

Jan 17, 2007

#11

• Jan 17, 2007

• #11

3.73's or 4.10's it all depends on how much highway driving your doing!

 

Dusstbuster

I love meat more than anything! I just have a spec

May 31, 2004

1,462

33

64

Moorhead, Minnesota

Jan 17, 2007

#12

• Jan 17, 2007

• #12

I got 3.73's with my Auto just for the fact that I travel interstate every morning to work and going to the lakes on interstate for 45 minutes at 28-3000rpms gets annoying. Granted the 3.73's got me out of the 2200 drone zone so my ears don't ring nearly as bad after longer trips but still taching that high leaves you little room to accelerate much more. IMO the perfect gear for an automatic tranny that still has the stock redline is 3.73's. If your car can handle the higher rpm's then get 4.10's for sure. For me 3.73's were perfect though.

 

DropTopPony

Noob Slayer

Founding Member

Aug 13, 2002

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south jersey

Jan 17, 2007

#13

• Jan 17, 2007

• #13

I went with 3.73's but i knew i was getting a PD blower...otherwise i would have gone 4.10's.

 

'01 Steed

Founding Member

Aug 2, 2002

482

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Michigan

Jan 17, 2007

#14

• Jan 17, 2007

• #14

4.10's -- VT Stage II's -- 3600 stall -- 21 mpg on the highway (at 70 mph).

You'll get used to the engine speed at 70. Not to mention the fact that you're making more power in that rpm range, so walking away from traffic is ALOT easier.

 

9

98GT4Speed

New Member

Jan 8, 2007

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Jan 17, 2007

#15

• Jan 17, 2007

• #15

The one thing I have never seen and would like to see is - How much does installing 4.10's knock off your ET from 3.27's? No one ever seems to mention this.

 

Dusstbuster

I love meat more than anything! I just have a spec

May 31, 2004

1,462

33

64

Moorhead, Minnesota

Jan 17, 2007

#16

• Jan 17, 2007

• #16

That's a huge driver issue. I've heard it can lower times by .5 seconds, although depending on your driving abilities/tranny it could be more or less. Heck, if you can't control your newfound torque you might even get HIGHER times at first just cuz you'll be peeling out through 1st gear

 

S

svt_god

New Member

Jun 23, 2005

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Jan 17, 2007

#17

• Jan 17, 2007

• #17

I have a 02 GT 5spd and went with 4.10s. My gas milage has stayed the same around 22-24. I have always heard that autos needed a steeper gear, and I wish I would have went with 4.30s. But thats just me. DON'T FEAR THE GEAR! 4.6s love the upper rpm!

 

'01 Steed

Founding Member

Aug 2, 2002

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Michigan

Jan 17, 2007

#18

• Jan 17, 2007

• #18

98GT4Speed said:

The one thing I have never seen and would like to see is - How much does installing 4.10's knock off your ET from 3.27's? No one ever seems to mention this.

Click to expand...

4/10's here. I went from a 14.1 to a 13.7. The gears were one of my first mods.

 

Give Me TP

Member

Jun 17, 2004

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Republic of Texas

Jan 18, 2007

#19

• Jan 18, 2007

• #19

4.10's here in both my '03 Mach 1 5-speed and in my wife's '04 V6 automatic. Wouldn't go with anything different, and they are both used as daily drivers and have been on long highway trips without any significant drop in gas mileage compared to the stock gears.

 

BlackGT4.6

New Member

Jun 15, 2005

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In.

Jan 18, 2007

#20

• Jan 18, 2007

• #20

4.10's all the way