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Old 05-09-2012, 03:43 PM   #1
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How to find out gears??

How do I find out my gearing on my 98 4L with the d35?

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Old 05-09-2012, 03:44 PM   #2
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Look on the diff cover... should be a stamped plate on there somewhere.

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Old 05-09-2012, 03:45 PM   #3
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Spin the tire one complete revolution. Count how many times the pinion rotates. ~3.5 turns = 3.55s. A little less than 4 turns = 3.73s. Over 4 turns = 4.10 and so on and so on.
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Old 05-09-2012, 04:04 PM   #4
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It says 41356 on the diff, what does that mean?
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Old 05-09-2012, 04:58 PM   #5
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Originally Posted by CJYJTJJK View Post
It says 41356 on the diff, what does that mean?
That is the code that tells you to spin the tire one full rotation and count the rotations of the pinion. Only way to be 100% sure what is in it.
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Old 05-09-2012, 05:14 PM   #6
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That is the code that tells you to spin the tire one full rotation and count the rotations of the pinion. Only way to be 100% sure what is in it.
Wheres the pinion?
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Old 05-09-2012, 05:15 PM   #7
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Hooked up to the yoke that is hooked up to your drive shaft.
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Old 05-09-2012, 07:13 PM   #8
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How do I find out my gearing on my 98 4L with the d35?
Check out this link, be sure to read the tips & warnings
http://www.ehow.com/how_12156231_calculate-gear-ratios-rotating-rear-wheel.html
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Old 05-09-2012, 07:19 PM   #9
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or register on jeep.com and go to owners and punch in your vin and it will come up with the build sheet. but then you ahve to assume it hasnt been changed.
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Old 05-09-2012, 08:24 PM   #10
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or register on jeep.com and go to owners and punch in your vin and it will come up with the build sheet. but then you ahve to assume it hasnt been changed.
I would try that but the PO swapped out a d35 from another wrangler because the old one went
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Old 05-09-2012, 08:29 PM   #11
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Check out this link, be sure to read the tips & warnings
http://www.ehow.com/how_12156231_calculate-gear-ratios-rotating-rear-wheel.html
Thanks I'll try that tomorrow. I didn't know the wheel had to be turned twice, I thought only once
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Old 05-09-2012, 08:31 PM   #12
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It's either 3.07 or 3.73. If your Jeep has plenty of power, odds are good it's 3.73. If it's a dog, it has the 3.07.

But... look on the front axle, odds are good its axle tag is still there. Look on the second row of numbers, you'll find the ratio as in the below tag that is showing 3.73.

Don't be surprised if it says 3.74 or 3.08 instead of 3.73 or 3.07, the TJ's front and rear axle ratios are .01 apart.

And with an open axle when both tires are off the ground, you have to rotate the tire twice to cause the pinion shaft to rotate the driveshaft a number of revolutions to equal the axle ratio. Be sure the transfer case has been shifted into Neutral before attempting this.
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Old 05-09-2012, 08:44 PM   #13
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It's either 3.07 or 3.73. If your Jeep has plenty of power, odds are good it's 3.73. If it's a dog, it has the 3.07.

But... look on the front axle, odds are good its axle tag is still there. Look on the second row of numbers, you'll find the ratio as in the below tag that is showing 3.73.

Don't be surprised if it says 3.74 or 3.08 instead of 3.73 or 3.07, the TJ's front and rear axle ratios are .01 apart.

And with an open axle when both tires are off the ground, you have to rotate the tire twice to cause the pinion shaft to rotate the driveshaft a number of revolutions to equal the axle ratio. Be sure the transfer case has been shifted into Neutral before attempting this.
The tag on my rear axel reads 2111760AB on the first row, and 07 5993-1 on the second row. Any ideas what that could mean? I know it's not the factory axel, it was swapped out of another wrangler by the PO
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Old 05-09-2012, 08:46 PM   #14
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Read your tag a little more carefully or clean it off better... I'm betting that '07' is actually saying '3 07'.
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Old 05-09-2012, 09:04 PM   #15
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Read your tag a little more carefully or clean it off better... I'm betting that '07' is actually saying '3 07'.
Yep you were right, the tag was bent so it was tough to see the 3. Is 3.07 too low to run 33s?
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Old 05-09-2012, 09:17 PM   #16
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I wouldn't even consider trying to run 33" tires with 3.07. I wouldn't even like running 30" tires with 3.07.
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Old 05-09-2012, 09:34 PM   #17
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I wouldn't even consider trying to run 33" tires with 3.07. I wouldn't even like running 30" tires with 3.07.
Ouch, I'm running 31x10.5s now and not having any problems
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Old 05-09-2012, 10:46 PM   #18
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Ouch, I'm running 31x10.5s now and not having any problems
"Not having any problems" is all relative. If you drove a Jeep properly geared for that size tire, I think you'd probably no longer be happy with your current gearing.

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