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-   -   How to find out gears?? (http://www.wranglerforum.com/f282/how-to-find-out-gears-159154.html)

CJYJTJJK 05-09-2012 02:43 PM

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

02Prove 05-09-2012 02:44 PM

Look on the diff cover... should be a stamped plate on there somewhere.

MR.CLIFFORD 05-09-2012 02:45 PM

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.

CJYJTJJK 05-09-2012 03:04 PM

It says 41356 on the diff, what does that mean?

MR.CLIFFORD 05-09-2012 03:58 PM

Quote:

Originally Posted by CJYJTJJK (Post 2351551)
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.

CJYJTJJK 05-09-2012 04:14 PM

Quote:

Originally Posted by MR.CLIFFORD (Post 2351738)
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?

MR.CLIFFORD 05-09-2012 04:15 PM

Hooked up to the yoke that is hooked up to your drive shaft.

50Johnbob 05-09-2012 06:13 PM

Quote:

Originally Posted by CJYJTJJK (Post 2351490)
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

lee indy 05-09-2012 06:19 PM

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.

CJYJTJJK 05-09-2012 07:24 PM

Quote:

Originally Posted by lee indy (Post 2352202)
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

CJYJTJJK 05-09-2012 07:29 PM

Quote:

Originally Posted by 50Johnbob (Post 2352184)
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

Jerry Bransford 05-09-2012 07:31 PM

1 Attachment(s)
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.

CJYJTJJK 05-09-2012 07:44 PM

Quote:

Originally Posted by Jerry Bransford (Post 2352408)
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

Jerry Bransford 05-09-2012 07:46 PM

Read your tag a little more carefully or clean it off better... I'm betting that '07' is actually saying '3 07'.

CJYJTJJK 05-09-2012 08:04 PM

Quote:

Originally Posted by Jerry Bransford (Post 2352469)
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?

Jerry Bransford 05-09-2012 08:17 PM

I wouldn't even consider trying to run 33" tires with 3.07. I wouldn't even like running 30" tires with 3.07.

CJYJTJJK 05-09-2012 08:34 PM

Quote:

Originally Posted by Jerry Bransford (Post 2352564)
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

Jerry Bransford 05-09-2012 09:46 PM

Quote:

Originally Posted by CJYJTJJK (Post 2352612)
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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