did 3 1/2 turns on my differential... what gear ratio do i have???

phenix86

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Jan 5, 2004

#1

• Jan 5, 2004

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so at 80mph im pushin around 2600 2700 rpm.. so before i decide to instal my 4 10s im curious to find what gear ratio i have... so i jacked up my car on the rear and marked the differential with white chalk and then i spun the wheel 1 full time and had my friend count how many times the differential turned for 1 full swing of the tire. It did almost 3 1/2 turns on the differential for one full turn on the rim. Does anyone have any idea of what kind of gears it is with almost a 3 1/2 turns???!?!? someone tell me somethin good here... hopefully 3 73's


anyone??

thanks in advance!

 

Beau

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Jan 5, 2004

#2

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isn't your stock differential 3.27?

 

Saleen201

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Jan 5, 2004

#3

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I would think 3.73.... isnt it 3.73 turns of the driveshaft to torn the wheel one full turn

 

phenix86

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Jan 5, 2004

#4

• Jan 5, 2004

• #4

Saleen201 said:

I would think 3.73.... isnt it 3.73 turns of the driveshaft to torn the wheel one full turn

Click to expand...

i sure as hell hope so!!!!!

 

phenix86

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1990StangLX said:

isn't your stock differential 3.27?

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ya but im thinking someone added a good gear to my car before i got it.

 

phenix86

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btw.. my car is an AUTO

 

Beau

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Jan 5, 2004

#7

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torque187 said:

ya but im thinking someone added a good gear to my car before i got it.

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oh i didnt know you bought it used..so maybe theres 3.55 gears on there or 3.73's?

 

phenix86

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im very interested to see what it is.

 

KaPPaBaLL

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BAYAREA

Jan 5, 2004

#9

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3 and half turns on the driveshaft is exactly 3.55 gears...

 

J

johndeerrm

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Jan 5, 2004

#10

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Im sorry to sound like a dick but this is the stupidest thread i have read in a long time.

Turn the wheel 1 time and get 1 rotation of the drive shaft you have 1:1 gears

Turn the wheel 1 time and get 3.5 rotations of the drive shaft you have 3.5:1 gears.

Just over 4 revolutions of the drive shaft to one revolution of the wheels? 4.10's!!!

 

4.6MustangSteve

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Jan 5, 2004

#11

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Yup, 3.55's indeed.

 

B C

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Jan 5, 2004

#12

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Almost 3.5 turns sounds like it could be 3.27 gears. Was it a just over 3.5 turns or less than 3.5 turns?

 

mrvax

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Jan 5, 2004

#13

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• #13

B C said:

Almost 3.5 turns sounds like it could be 3.27 gears. Was it a just over 3.5 turns or less than 3.5 turns?

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Agreed. Most likely 3.27 gears.

 

01MustangMan

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Jan 5, 2004

#14

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Eaither 3.27's or 3.55's

 

HoustonGT

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Jan 5, 2004

#15

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If its an auto, doesn't that mean that you would also have a chip to correct the speedo and shift points if the gears were changed? Im gonna say 3.27's

 

satter_m

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Jan 5, 2004

#16

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HoustonGT said:

If its an auto, doesn't that mean that you would also have a chip to correct the speedo and shift points if the gears were changed? Im gonna say 3.27's

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Not necessarily - someone could have used a Hypertech or other computer to correct the speedo. However, I'm going to vote for 3.27s since those are what come stock.

 

jrc_03_gt

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#17

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probably 3.27 gears.

 

G

GinoGT

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#18

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johndeerrm said:

Im sorry to sound like a dick but this is the stupidest thread i have read in a long time.

Turn the wheel 1 time and get 1 rotation of the drive shaft you have 1:1 gears

Turn the wheel 1 time and get 3.5 rotations of the drive shaft you have 3.5:1 gears.

Just over 4 revolutions of the drive shaft to one revolution of the wheels? 4.10's!!!

Click to expand...

 

TomBadger

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Jan 6, 2004

#19

• Jan 6, 2004

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I believe autos came with 3.55s, while the sticks came with 3.27s.

 

jadesville

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Jan 6, 2004

#20

• Jan 6, 2004

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TomBadger said:

I believe autos came with 3.55s, while the sticks came with 3.27s.

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i believe you're right