4:10 vs 4:30's in a 02 auto gt

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big T

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Feb 25, 2004

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Hawaii, oahu

Apr 4, 2004

#1

• Apr 4, 2004

• #1

I know its been asked a few times somewhere in this forum, but I can't find it. Which is better in my auto? What would the rpms be crusing the freeway at about 70mph? Would the 430's make much difference anyway? THX. I use the car as a daily driver and I would like to top out at least 140-150 mph. I plan on staying N/A as well and waiting for the hypertech/predator programmers to come out for the 02 auto's. I would also like to run in the 13's in the 1/4 mile as well. Are any of these gears going to kill my engine by 100,00 miles? THX

 

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HogStang

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Mar 25, 2004

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Apr 4, 2004

#2

• Apr 4, 2004

• #2

I was sort of also wondering this myself.. but in my case.. I'm going with these 3.90's for my 03 Auto GT.. I'd rather not go 4.10's becuase I don't want to have the high rpms while cruising on the freeway.. Anyone know how much of a difference with my Auto I should feel from the stock gears to these 3.90's?

 

Defleshed

Satanic Mechanic

Nov 30, 2003

10,569

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In Torment, In Hell

Apr 4, 2004

#3

• Apr 4, 2004

• #3

pm me on thursday (planning to set aside time on all day on wednesday to install), i'll let you know how my 4.10s in my auto 02 GT are working out from stock 3.27s.

 

DBMSTNG

I fantasize about it being BIG!

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Apr 23, 2002

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not quite here

Apr 4, 2004

#4

• Apr 4, 2004

• #4

4.30's are gonna be steep. what are your plans for the car?

 

BlackenedSVT

Active Member

Jan 18, 2004

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New Jersey

Apr 4, 2004

#5

• Apr 4, 2004

• #5

FYI i have 4.10s in my 98GT Auto right now..my top end is like ~110mph. Since the car has no 5th gear (like a 5speed) it is stuck in 4th doing 110mph. It can go a little faster, but the RPMs are high.

I would recommend 3.73's if you are Auto, and STAYING auto. The 4.10s are fun, and they are FINE, even for driving on the highway. But i personally like to go 125mph and what not sometimes and if i were to even get near 120mph my car would be screaming, and even cruising at 110 is a bit high! When i coast at like ~80mph my rpms are ~3,500. Which is kinda high... ...I am switiching my car to a manual though, so i will get that 5th gear soon

 

BlackenedSVT

Active Member

Jan 18, 2004

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New Jersey

Apr 4, 2004

#6

• Apr 4, 2004

• #6

Don't go 3.90's. They are made by other companies and are constructed of a softer material and need replacing after ~30-50k miles. Just from what i've heard. Anyway, go with FRPP gears

 

01GTConv

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Jan 16, 2004

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Highlands Ranch, CO

Apr 4, 2004

#7

• Apr 4, 2004

• #7

I am looking at going with 4.1's for my 2001 GT Auto. With my tires in overdrive at 80mph I would be at about 2964rpms. With 3.7's I would be at 2697rpms....not really a huge difference. Personally, I like to get to 80 really fast, but hardly ever go faster.

 

bamagrad03

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Feb 19, 2004

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Apr 4, 2004

#8

• Apr 4, 2004

• #8

I have an 00 auto with 4.10s. I like them, but get about 17mpg on the interstate at 85mph. grrrrrr.

 

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HogStang

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Mar 25, 2004

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Apr 4, 2004

#9

• Apr 4, 2004

• #9

UDTBadKarma.. well.. my 3.90's are made by Pro 5.0 and from what I've heard they're hard to keep in stock (partshopper had to drop-ship them to me from manufacture). Any idea where you heard they only lasted 30-50K miles? Anywho.. I know some people on this forum have said that they've gotten good results with the 3.90's... do you have an article or something with a bad review you could post in this thread.. becuase if they are what you say they are I'd like to read it too. Thanks.

 

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TARZAN

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Apr 25, 2003

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Philly MS

Apr 5, 2004

#10

• Apr 5, 2004

• #10

YES, I AM "THAT GUY"!!!!

I have 4.30's in my 00 GT Auto, and I LOVE THEM!!!!!!!!!

-Will

 

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TARZAN

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Apr 25, 2003

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Philly MS

Apr 5, 2004

#11

• Apr 5, 2004

• #11

DP

-Will