4.10 or 4.30 Gears

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brianwcooper

New Member

Aug 28, 2009

2

0

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Sturgis, SD

Sep 9, 2009

#1

• Sep 9, 2009

• #1

Trying to decide between going with 4.10 gears or 4.30's. Car is a 99 Mustang with a T56 6 Speed and vortech supercharger. Curretly have 3.73's and am just wanting something a little deeper for when i go drag racing at the local track, which is a 1/8th mile. Car will be used mostly on the street but want to race it as much as possible next year. I will be running a set of either a 26" or 28" ET Street Tires on the rear. Just was wandering if anybody has much expierence with the 4.30 gears, see alot of people are running 4.10's.

 

VEE EIGHT

Member

Apr 27, 2009

85

0

6

Texas

Sep 10, 2009

#2

• Sep 10, 2009

• #2

There's a thread in Talk about 4.30's in a 2V.

Personally, I think 4.30's are too much gear for a DD street car. I enjoy the occasional highway race (IN MEXICO OF COURSE) and Im afraid that 4.30's would kill my top-end too much. Im getting some 4.10's next month.

 

98COBRA281

10 Year Member

Nov 24, 2007

1,348

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Port St. Lucie, Florida

Sep 10, 2009

#3

• Sep 10, 2009

• #3

4.30's are a ton of fun, but i would not put then if a car with a blower, it would be to much. im all motor with 310rwhp, 1st and 2nd just burn like a joke, and if i hit 3rd right it will fight for traction at first then hook, ever thought about going 3.90's

 

scupking

Active Member

Sep 18, 2005

1,186

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Enfield, CT

Sep 10, 2009

#4

• Sep 10, 2009

• #4

Don't do 4.30s with a blower. I would say 3.73s or 4.10s would be best for you.

 

trinity_gt

10 Year Member

Jan 31, 2003

3,125

81

99

Canada

Sep 10, 2009

#5

• Sep 10, 2009

• #5

I love my KB/3.73 set up but everyone is different. On the street, your centri might like a bit more gear than my twin screw...

If you're going to race the car, do some math to find the optimal gear. If you know your current trap speed you can choose a gear that puts you in the optimal gear and RPM window as you cross the traps. I wouldn't go by guesses and mere suggestions here if ETs are important to you.

 

'13_ImpactBlue_GT

Angry Little Elf

Mar 30, 2005

872

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98

Where the men are men and the sheep are nervous

Sep 11, 2009

#6

• Sep 11, 2009

• #6

4.30's for me the next time around

 

bhuff30

Founding Member

Dec 11, 2001

6,037

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129

Olathe KS

Sep 11, 2009

#7

• Sep 11, 2009

• #7

First, you need to decide the tire size. The tire size is a much bigger change than the jump from 4.10 to 4.30!
Then, decide what gear you want to end the 1/8th mile in and what your mph is then. I'm guessing you'll want to cross 1/8th traps at 6000rpm in 3rd. If you normally run 90mph in the 1/8th, then choose the gears that will put put you at 90mph in 3rd at 6000rpm. If you expect to go faster, chose the next lower gear so you don't run out of rpms.

People are shouting out gear ratios, but it is all just flying poo. You have to decide the tire size, and do the calculations!

 

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brianwcooper

New Member

Aug 28, 2009

2

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Sturgis, SD

Sep 11, 2009

#8

• Sep 11, 2009

• #8

I am going to go with 4.10's and a 28" tall ET Street Tire. Should put me around 94 mph @ 6000 RPM's in third with the Cobra T56 6 Speed. Which would be about perfect. Thanks alot for all of the responses.