gear question

97yelstang

Member

Sep 12, 2004

43

0

6

Schuykill Haven, PA

Mar 13, 2007

#1

• Mar 13, 2007

• #1

ok i have 3.55 gears and i want to get something else 3.90 or something
i tach about 2500 at 75mph...sound about right?
what would it be if i had 3.90s or 4.10?
i also don't want my first and second gears to be too short, my friend had a 97 cobra with 4.10s and they were perfect for his car...
and about what would my top speed be? i think he topped his out at 140 or 150 not sure tho, just wondering so i know how much room i have to play with

 

Tim2002GT

Founding Member

Apr 10, 2002

635

4

29

Tulsa, Oklahoma

Mar 13, 2007

#2

• Mar 13, 2007

• #2

I just recently had 4.10's installed in my car. At 70 mph I am running about 2400 rpms. 1st gear is pretty short, but it isn't too bad. What I like about it is, every time I shift, the rpms stay within my engines power range. Like if I shift at 2500 the rpms only drop down to about 1800-2000 rpm. It seems like it pulls in every gear now! 5th gear even has a little pull to it! As far as top speed, well, I haven't ran it up past 100 yet. Follow this link and there are a few videos of a 4.10 car running it up to about 130+. http://forums.stangnet.com/showthread.php?t=521948

 

BurningRubber

10 Year Member

Dec 6, 2004

1,865

24

58

Mar 14, 2007

#3

• Mar 14, 2007

• #3

This will help you out...

http://www.tchracing.com/tech/gearc...m&givenval=60&givenvaltype=MPH&selectedgear=5

 

squares98

Member

Aug 20, 2004

852

0

17

Orange,ca

Mar 14, 2007

#4

• Mar 14, 2007

• #4

3:73's with a t-45. 4:10's with a t-3650

 

04YELLOWGT

Active Member

Jun 29, 2005

1,135

2

39

Indiana

Mar 14, 2007

#5

• Mar 14, 2007

• #5

Get the 4.10s you wont regret it. As far as top speed, in my auto Ive only been to 120ish but that was not in OD

 

Stan Weiss

Member

Dec 8, 2006

347

2

16

Philadelphia, PA

Mar 14, 2007

#6

• Mar 14, 2007

• #6

With 3.90:1 and stock 245-45-17 tires 75 MPH will be around 2565. In theory top speed should be around 152. But more like around 135 - 140 unless you are on the salt flats.
With 4.10:1 and stock 245-45-17 tires 75 MPH will be around 2700.