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Old 12-31-2012, 09:08 PM   #1
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Determing gear ratio in stock MT 95 YJ

Is there a way to determine what gears I have in my YJ, minus putting it up on blocks and turning the drivetrain and view the axle to determine how many rotations I get from each turn? Possibly by the VIN or something else? I have had it since new in 95, only owner, so I know no changes made since factory.

Also, what recommendations for gear/ axle upgrades? I have had it in storage for over 8 years, just got it shipped out to me so I'm making some upgrades now. The 33s take a bit to get going, so I'm guessing I have 3.07 gears. Looking at possible 3.73 or 4.11 with lockers. I'm not to familiar with the axle and gear upgrades.

Thanks

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Old 12-31-2012, 09:14 PM   #2
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Quote:
Originally Posted by Finn Sizzle View Post
Is there a way to determine what gears I have in my YJ, minus putting it up on blocks and turning the drivetrain and view the axle to determine how many rotations I get from each turn? Possibly by the VIN or something else? I have had it since new in 95, only owner, so I know no changes made since factory.

Also, what recommendations for gear/ axle upgrades? I have had it in storage for over 8 years, just got it shipped out to me so I'm making some upgrades now. The 33s take a bit to get going, so I'm guessing I have 3.07 gears. Looking at possible 3.73 or 4.11 with lockers. I'm not to familiar with the axle and gear upgrades.

Thanks
There should be a tag on one of the bolts that hold the diff covers on that will have the gears stamped in them. If it is a 4.0L 5 speed, I am betting 3.07.

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Old 12-31-2012, 09:19 PM   #3
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If it is the 4cyl with 5 spd it is 4:10

I went to 4:88 in my mine but it is the 4 cyl with 32-11.5-15 and it pulls well to 75 now
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Old 12-31-2012, 09:53 PM   #4
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It's a 4.0 5 speed, yes. I'll check and see if there is a tag
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Old 12-31-2012, 10:01 PM   #5
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If there is no tag you can always try to count tire revs vs drive shaft revs.
Got to make sure both tires spin at the same rate or spin only one and divide the number you get by 2. I think or multiply if its way off.
Brain just turned off.
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Old 01-01-2013, 12:25 AM   #6
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Just pop your diff cover off and count the ring gear teeth and then count pinion gear teeth. There's charts online to show you what gearing you have or take the 2 numbers and divide them into each other.
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Old 01-01-2013, 12:32 AM   #7
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Just pop your diff cover off and count the ring gear teeth and then count pinion gear teeth. There's charts online to show you what gearing you have or take the 2 numbers and divide them into each other.
Probably could use a diff fluid change anyways.
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Old 01-01-2013, 10:53 AM   #8
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Originally Posted by Speedy4x4 View Post

Probably could use a diff fluid change anyways.
True. Good time to change the fluid check the gears for a lot of extra ware and stuff.
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Old 01-01-2013, 12:07 PM   #9
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Originally Posted by cakes567

True. Good time to change the fluid check the gears for a lot of extra ware and stuff.
Yep, had that on the calendar for next weekend!
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Old 01-01-2013, 05:54 PM   #10
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Originally Posted by Finn Sizzle View Post

Yep, had that on the calendar for next weekend!
Then that's what id do. It's gotta be the best way. Because your acutely counting the gears and know for face how many teeth you have.
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Old 01-01-2013, 06:37 PM   #11
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Originally Posted by Hanksride View Post
There should be a tag on one of the bolts that hold the diff covers on that will have the gears stamped in them. If it is a 4.0L 5 speed, I am betting 3.07.
I found out by contacting Jeep here and asking for a copy of my build sheet...since I wasn;t the original owner I had to prove it was currently tittled in my name but they were so cool about helping me out
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Old 01-01-2013, 08:00 PM   #12
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Originally Posted by tommyjeep View Post

I found out by contacting Jeep here and asking for a copy of my build sheet...since I wasn;t the original owner I had to prove it was currently tittled in my name but they were so cool about helping me out
It all depends on what year your jeep is. Mine is a 87 and they can't run the vin to find any of that info or anything like that. The computers don't go back that far anymore.
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Old 01-02-2013, 09:28 PM   #13
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Quote:
Originally Posted by cakes567

It all depends on what year your jeep is. Mine is a 87 and they can't run the vin to find any of that info or anything like that. The computers don't go back that far anymore.
I have an 87 and I called the other day to find my gear ratio and they had all the information about the jeep except for the gear ratio! The one thing that I needed!
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Old 01-02-2013, 09:47 PM   #14
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I have an 87 and I called the other day to find my gear ratio and they had all the information about the jeep except for the gear ratio! The one thing that I needed!
Ya that's what the dealer said to me everything but the ratio! So I just went in and counted my self!

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