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Old 09-09-2013, 08:12 AM   #1
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gears

How do I tell what gear my car has in it
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Old 09-09-2013, 08:23 AM   #2
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The rear Pumpkin should have a sticker from factory. But if someone put an aftermarket one in the past I don't know how to say other than doing the math and seen what Rpm u have at 60
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Old 09-09-2013, 09:17 AM   #3
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Jack the rear end up. Mark the bottom of the wheel and drive shaft. Turn the wheel one revolution while counting how many times the ds turns.

3.73 is three and three quarters.
3.31 is three and a quarter.
4.10 is four turns.
3.55 is three and a half turns.
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Old 09-09-2013, 11:09 AM   #4
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The best thing to do is to crack open the rear diff and see what number is on the gear.
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Old 09-09-2013, 11:11 AM   #5
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You can check the codes on your door...there should be a sticker inside the outside jam.

Here's the codes

8 = 2.73:1 w/ non-locking (open) differential
M = 2.73:1 w/ locking (Traction-Lok) differential

Y = 3.08:1 w/ non-locking (open) differential
Z = 3.08:1 w/ locking (Traction-Lok) differential

5 = 3.27:1 w/ non-locking (open) differential
E = 3.27:1 w/ locking (Traction-Lok) differential

F = 3.45:1 w/ non-locking (open) differential
R = 3.45:1 w/ locking (Traction-Lok) differential

6 = 3.73:1 w/ non-locking (open) differential
W = 3.73:1 w/ locking (Traction-Lok) differential
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Old 09-09-2013, 11:15 AM   #6
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Quote:
Originally Posted by Defiant 5.0 View Post
The best thing to do is to crack open the rear diff and see what number is on the gear.
That's an expensive option just to find out what gears in it.
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Old 09-09-2013, 11:36 AM   #7
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Quote:
Originally Posted by tc x 4 View Post

That's an expensive option just to find out what gears in it.
This is true, but I used all of the afore mentioned methods and thought I had 3.90's. Come to find out I have 4.10's.
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Old 09-09-2013, 06:23 PM   #8
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Quote:
Originally Posted by 01LaserCobra View Post
You can check the codes on your door...there should be a sticker inside the outside jam.

Here's the codes

8 = 2.73:1 w/ non-locking (open) differential
M = 2.73:1 w/ locking (Traction-Lok) differential

Y = 3.08:1 w/ non-locking (open) differential
Z = 3.08:1 w/ locking (Traction-Lok) differential

5 = 3.27:1 w/ non-locking (open) differential
E = 3.27:1 w/ locking (Traction-Lok) differential

F = 3.45:1 w/ non-locking (open) differential
R = 3.45:1 w/ locking (Traction-Lok) differential

6 = 3.73:1 w/ non-locking (open) differential
W = 3.73:1 w/ locking (Traction-Lok) differential
LOL those look like fox body gears.
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Old 09-09-2013, 07:19 PM   #9
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Quote:
Originally Posted by Defiant 5.0 View Post

This is true, but I used all of the afore mentioned methods and thought I had 3.90's. Come to find out I have 4.10's.
You didn't count right.
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Old 09-09-2013, 07:29 PM   #10
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Cliffy k did a calculator that is pretty dead on. If u search it's in one of the threads.
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Old 09-09-2013, 07:47 PM   #11
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Quote:
Originally Posted by 01LaserCobra View Post
You can check the codes on your door...there should be a sticker inside the outside jam.

Here's the codes

8 = 2.73:1 w/ non-locking (open) differential
M = 2.73:1 w/ locking (Traction-Lok) differential

Y = 3.08:1 w/ non-locking (open) differential
Z = 3.08:1 w/ locking (Traction-Lok) differential

5 = 3.27:1 w/ non-locking (open) differential
E = 3.27:1 w/ locking (Traction-Lok) differential

F = 3.45:1 w/ non-locking (open) differential
R = 3.45:1 w/ locking (Traction-Lok) differential

6 = 3.73:1 w/ non-locking (open) differential
W = 3.73:1 w/ locking (Traction-Lok) differential
What is the code for 3:15
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Old 09-09-2013, 09:15 PM   #12
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Quote:
Originally Posted by tc x 4 View Post

You didn't count right.
Eh, you're probably right. Had to change out bearings anyway, so I I say whatevs.
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Old 09-15-2013, 06:37 PM   #13
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Quote:
Originally Posted by tc x 4 View Post

You didn't count right.
To get a better resolution, I would turn the tire several turns and count the corresponding drive shaft turns. Gear Ratio is number to DS turns divided by number of tire turns.
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