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Old 05-01-2014, 10:14 AM   #1
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Identifying Axle and Gear Ration on Used Wrangler

Morning everyone. I apologize for what may be a stupid question, but I'm trying to find out some information. My fiance bought a used Wrangler the other day and it came with what looks like a 4" Procomp lift kit and 33' tires as well as some other performance goodies. I have some concerns about her lift kit and tires though, especially after beginning my research here on axles and gear rations when getting larger tires. Is there any way to identify what kind of axle and gear ration she has without taking the jeep to a shop and disassembling parts or am I thinking about something that is not plausible?

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Old 05-01-2014, 10:22 AM   #2
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Unless the previous owner removed it, there is a tag as shown below that will has the axle ratio embossed into it. The tag below is indicating the axle has a 3.73 ratio.

Her front axle is a Dana 30, that is what came in all non-Rubicon Wranglers.

The rear axle can either be the standard Dana 35c or the optional/stronger/more desirable Dana 44. The first axle pic shows the Dana 35c, it will have a black plastic snap-in plug in its perfectly oval-shaped cover's lubricant fill hole. The last pic shows the Dana 44, it has a threaded steel plug in its more stopsign-shaped cover's lubricant fill hole.
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Old 05-01-2014, 10:23 AM   #3
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The Wrangler probably has either a D35 or D44 in the rear,and a D30, or if a Rubicon, a D44 in the front. Here are some pictures of the different axle housings. If the axles have not been regeared, there should be a tag bolted on the driver's side rear of the pumpkin. The one pictured below is 3.73. If the tag is missing, you can jack up one back wheel and on an open differential, turn the tire two complete revolutions and count the number of revolutions the drive shaft makes to determine the gear ratio. In the case of the 3.73, it woul be about 3 3/4 turns.

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Old 05-01-2014, 10:32 AM   #4
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Looking at cover on back diffy will tell 44 from 35 or a photo posted to the forum

For gear ratio
if open diffy
Do not start jeep
do not apply parking brake but put blocks in front and behind front tires
Jack up one rear tire
put transfer case in neutral
Rotate drive shaft till the u joint at rear diffy has one part of the cross straight down
Mark inside of jacked up rear tire with chalk at bottom pointing straight down
Mark the diffy u joint at diffy straight down part with chalk
Now turn drive shaft the same way 1/4 turn (one part of u joint cross at a time) at a time carefully counting until rear tire makes 2 full rotations
the number of full drive shaft ritations to make those two tire rotations is your ratio
ie 4 full rotations plus 1/2 of another quarter rotation to make the 2 tire rotations is a 4.11 ratio

If the jacked up rear wheel will not rotate with TC in neutral you have a lock or limited slip and you have to jack up both rear wheels as they turn together
I this case it is the number of drive shaft rotations for ONE full rotation of both rear tires.
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Old 05-01-2014, 10:40 AM   #5
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Awesome, thanks you guys. Now, here's another question, it looks like the axle is a Dana 30 and I think the gear ratio is 3.07. Now with 33" tires, is this a problem?
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Old 05-01-2014, 10:43 AM   #6
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3.07 would not be a good choice of ratio for 33" tires. The correct ratio to go with depends on her engine size (4 vs. 6 cylinder), model year, and transmission type, auto or manual.
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Old 05-01-2014, 10:45 AM   #7
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What problems could occur with this set up? It has Dana 30 axles in the front and back with 3.07 gear ratio.
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Old 05-01-2014, 10:49 AM   #8
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Besides the obvious poor performance...it will burn more fuel.........
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Old 05-01-2014, 10:49 AM   #9
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3.07 and 33" tires is a mis-match that results in a significant hit to the power the engine is able to deliver to the rear tires. Not to mention worse fuel economy. And with a manual transmission where you would need to slip the clutch more due to that mismatch, it would accelerate clutch wear.
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Old 05-01-2014, 10:52 AM   #10
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As long as there is not going to be anything catastrophic, then we are ok with that. However, is there a possibility of getting different/ better gears installed into the Dana 30 or would she require an entirely new axle?
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Old 05-01-2014, 11:07 AM   #11
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Yes the gears can be changed without changing the axle. And if you regear, you have to regear both the front and rear axles so they have the same ratio.
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Old 05-01-2014, 11:18 AM   #12
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Don't assume tag is correct ratio if PO added lift and bigger tires he may have already re-geared so gotta check what current ration is
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Old 05-01-2014, 11:43 AM   #13
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Very true. One day I'll have her take the Wrangler in to check, and if it needs bew gears, we'll do so in time. With this set up, what gears would you guys recommend? Manual transmission, I6, off roading but nothing serious by any means, ideas?
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Old 05-01-2014, 11:52 AM   #14
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Assuming the transmission is the 5-speed, 4.56 is the optimal highway and trail ratio for 33" tires.
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Old 05-01-2014, 11:54 AM   #15
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LOL ideas? We got all kinds...... I have a very similar setup...about 4" total lift 33" tires 5speed and 4.0...I have 4.88s in stock axles...it is about "perfect"
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Old 05-01-2014, 02:27 PM   #16
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Now in regards to gears an axles, I have seen so far in my research that Dana 44s with a 4.56 ratio is damn near ideal in most cases. For when I get my Wrangler, what would be the benefits of a 4.56 ratio in Dana 35 axles vs a 4.56 ratio in Dana 44 axles?
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Old 05-01-2014, 02:28 PM   #17
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The only difference is the Dana 44 is a much stronger axle more suitable to big tires and lockers.
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Old 05-01-2014, 04:41 PM   #18
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Thank tou for all your help. One final question for the time being, will my fiancé be able to tow anything with her current rig or is it unsafe to do so?
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Old 05-01-2014, 05:51 PM   #19
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Originally Posted by CelticMonster View Post
Thank tou for all your help. One final question for the time being, will my fiancé be able to tow anything with her current rig or is it unsafe to do so?
The maximum tow rating for a wrangler is 1500 pounds. With 3.07 gears, even that will be a struggle and very hard on a clutch.
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Old 05-01-2014, 06:01 PM   #20
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The SWB TJ's official max tow rating is actually 2000 lbs. The only exception is with the 2.5L engine and automatic transmission combination which is limited to 1000 lbs.
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Old 05-01-2014, 06:08 PM   #21
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So with 33" tires and potentially (not confirmed but at least that's how it's currently labled) 3.07 gear ratios in Dana 35 axles, what do you think would be the max towing capacity? Manual, 4.0L I6
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Old 05-01-2014, 06:12 PM   #22
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To know for sure, email Chrysler here http://m.chrysler.com/en/mobile/webs...ice/email.html with your jeeps vin number, they give you a complete build sheet of it. Takes a couple days to hear back but they're usually good about it.
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Old 05-01-2014, 06:15 PM   #23
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Thank you Midnight06
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Old 05-01-2014, 06:25 PM   #24
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But like I said before a modded jeep may or may not still have same same axle ratio it had originally as shown on the build sheet

My build sheet says 3.73 or something like that but my current gears are 4.56/4.55
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Old 05-01-2014, 06:34 PM   #25
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Quote:
Originally Posted by Jerry Bransford View Post
The SWB TJ's official max tow rating is actually 2000 lbs.
That's right...I think my memory is still working at 64kb.
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Old 05-01-2014, 07:09 PM   #26
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Mistake on post #21, I meant Dana 30 axles
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Old 05-01-2014, 08:41 PM   #27
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When towing, you also have to consider brakes. The TJ brakes will stop the Jeep OK but when you put a trailer behind it, I wouldn't go over 1000 pounds without either a hydraulic set up on the trailer or an electric brake setup with a controller. Too much and the trailer WILL push the Jeep, been there, done that.
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Old 06-03-2014, 02:48 AM   #28
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Quote:
Originally Posted by Midnight06 View Post
To know for sure, email Chrysler here Contact Chrysler with your jeeps vin number, they give you a complete build sheet of it. Takes a couple days to hear back but they're usually good about it.
Actually, if the vehicle is 1998 or later you can use this: Jeep - Contact Us

Under 'Your Vehicle' click on 'Equipment Listing'. Enter the VIN.

This produces a PDF buildsheet.

However, since this is a modified Jeep it would be best to do a visual check, in the event the previous owner changed it.

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