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Old 07-06-2011, 11:34 PM   #1
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Question about the Dana35

I believe my 94 YJ came with the rear Dana 35 rear axle. I've been looking around and I have not come up with a clear answer of what gears came stock with the aforementioned axle.

I would like to re-gear it according to this chart, since the PO has put in 31 inch tires on it.

Yellow=Highway Driving, Good Fuel Economy
Green=Daily Driver, Best Overall Performance
Blue=Most Power and Towing, Reduced Fuel Economy

I am looking at the daily driver, best overall performance ratios in green. (2.73,2.94,3.07) how ever any other better suggestions will be most welcome. Another question I have is the numbers in the green boxes associated with the 31 inch tires, not sure what they mean. (2755,2896,3008). I am guessing those numbers are based on a 1:1 gear ratio? I am lost.






(the above information came from Jeep Parts, Jeep Accessories & Jeep Soft Tops From The Jeep Parts Experts - Quadratec)

Also, is there anything special I should take into consideration when attempting this? I will look for a write up when I get all the research/ parts ordered.

Thanks,
Cam H.

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Old 07-06-2011, 11:48 PM   #2
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Cam,

if im not mistaken the 4 digit numbers with in the color boxes is the optimum RPM's in which your vehicle wiht operate at in its most efficent way with the gears and size of tires.

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Old 07-07-2011, 01:26 AM   #3
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What size engine? My 2.5 has 3.07. Could be 3.55, 3.73, 4.10.
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Old 07-07-2011, 01:34 AM   #4
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The chart shows the nominal RPM at 65 mph for a standard transmission in the 1:1 ratio gear (on 5 speeds that's usually 4th gear). I would recommend you find out what gear ratio you have by going 65 mph (checked with a gps, not the speedometer since it might not be accurate if tire size is not stock) in 4th gear and checking your RPMs. You can then look up your tire size and the closest RPMs. That should be the gears you have.
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Old 07-07-2011, 10:54 AM   #5
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I'm presuming you've checked the diff cover for the tag that has the ratio on it? If so and it's not there you can put a chalk mark on your driveshaft and one on your rear tire. Jack up the rear, put it in neutral and rotate your tire one revolution while keeping an eye on how many times the driveshaft rotates. Roughly 3:1 = 3.07, roughly 3 1/2:1 = 3.55, roughly 3 3/4:1 = 3.73, etc.
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Old 07-07-2011, 11:07 AM   #6
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What engine and transmission? 2.5 with AX5 5 speed manual should be 4.10 stock. 4.0/4.2 with ax15 5 speed should be 3.73 stock.
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Old 07-07-2011, 11:21 AM   #7
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From the profile I see 2.5cly. so stock gears are 4.11 though I recall some auto 4cly had the 3.07's or 3.73s. Never the less. if your going to spend the money on a regear, spend some more and upgrade the rear axle.. 8.8 swap, dana 44 out of an xj for example. For gears, assuming you already have the 4.11's I think you need to go to 4.88's, as 4.56 is not enough of a jump. However you 1st need to let us know what gears it has in it now.
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Old 07-07-2011, 11:43 AM   #8
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Quote:
Originally Posted by 10huey View Post
Cam,

if im not mistaken the 4 digit numbers with in the color boxes is the optimum RPM's in which your vehicle wiht operate at in its most efficent way with the gears and size of tires.
That makes sense to me now after reading another post on here, good call too.

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Originally Posted by Jeeprich25 View Post
What size engine? My 2.5 has 3.07. Could be 3.55, 3.73, 4.10.
2.5L

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Originally Posted by rmed4defense View Post
The chart shows the nominal RPM at 65 mph for a standard transmission in the 1:1 ratio gear (on 5 speeds that's usually 4th gear). I would recommend you find out what gear ratio you have by going 65 mph (checked with a gps, not the speedometer since it might not be accurate if tire size is not stock) in 4th gear and checking your RPMs. You can then look up your tire size and the closest RPMs. That should be the gears you have.
That's a really neat trick, I will have to try that today.

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Originally Posted by Mitchness View Post
I'm presuming you've checked the diff cover for the tag that has the ratio on it? If so and it's not there you can put a chalk mark on your driveshaft and one on your rear tire. Jack up the rear, put it in neutral and rotate your tire one revolution while keeping an eye on how many times the driveshaft rotates. Roughly 3:1 = 3.07, roughly 3 1/2:1 = 3.55, roughly 3 3/4:1 = 3.73, etc.
I will try that today, along with the GPS method used above.

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Originally Posted by Xpress View Post
What engine and transmission? 2.5 with AX5 5 speed manual should be 4.10 stock. 4.0/4.2 with ax15 5 speed should be 3.73 stock.
It is a 2.5L w/ the Ax-5. Sorry, I should have put that info in the original question.

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Originally Posted by 4Jeepn View Post
From the profile I see 2.5cly. so stock gears are 4.11 though I recall some auto 4cly had the 3.07's or 3.73s. Never the less. if your going to spend the money on a regear, spend some more and upgrade the rear axle.. 8.8 swap, dana 44 out of an xj for example. For gears, assuming you already have the 4.11's I think you need to go to 4.88's, as 4.56 is not enough of a jump. However you 1st need to let us know what gears it has in it now.
A man after my own heart, I would love to throw an 8.8 in there, since my ultimate goal is to put a 350 under the hood and upgrading the tranny, I will try to find out what gears are in there today, since I have some good information on how to find that out.
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Old 07-07-2011, 11:47 AM   #9
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I've yet to see a 2.5 with anything other than 4.10 from the factory
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Old 07-07-2011, 11:55 AM   #10
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Quote:
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i've yet to see a 2.5 with anything other than 4.10 from the factory
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Old 07-07-2011, 12:38 PM   #11
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I am assuming by "tag" You mean that little metal strip that bolts in on the 3 o' clock position on the diff cover, it is un-readable. Anyhow, I just snapped a picture of the cover itself, the bottom numbers are hard to read but read "C5 U4 94"-not sure if that helps.
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Old 01-28-2012, 03:49 PM   #12
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Quote:
Originally Posted by Mitchness View Post
I'm presuming you've checked the diff cover for the tag that has the ratio on it? If so and it's not there you can put a chalk mark on your driveshaft and one on your rear tire. Jack up the rear, put it in neutral and rotate your tire one revolution while keeping an eye on how many times the driveshaft rotates. Roughly 3:1 = 3.07, roughly 3 1/2:1 = 3.55, roughly 3 3/4:1 = 3.73, etc.
I just tried the chalk mark trick and my driveshaft only rotated 1.5 times to my tires' 1 time. Never heard of that ratio.
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Old 01-28-2012, 09:22 PM   #13
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Originally Posted by chensley View Post
It is a 2.5L w/ the Ax-5. Sorry, I should have put that info in the original question.
Stock is 4.10 gears. Do some power modifications and you can run 31's with authority (depending on the intake you have, you might see upwards of 35hp increase)

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I've yet to see a 2.5 with anything other than 4.10 from the factory
Automatic 4 cyl, comes with 3.73 gears.
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Old 01-29-2012, 01:03 AM   #14
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Quote:
Originally Posted by saddlemine2
I just tried the chalk mark trick and my driveshaft only rotated 1.5 times to my tires' 1 time. Never heard of that ratio.
If you're turning one tire while the other is stationary, you need to go 2 turns with the tire.
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Old 01-29-2012, 07:49 AM   #15
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The proper way to check your gear ratio without pulling cover would be to, with rear end jacked up and properly supported, mark the drive shaft and at least one tire. Then rotate the drive shaft, counting the revolutions until the tire makes one full revolution. If for example you rotate the drive shaft 4 revolutions to make 1 revolution of the tire, that would be 4.10:1. I also have never seen anything but 4.10 with 2.5 manual. Only 2.5 auto would have a different ratio.
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Old 01-29-2012, 07:59 AM   #16
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I have a 95 with stock rear end and if I read the dif cover correct I have 3:73 but with the 31's I am running I can't even Cruz in 5 gear just bogs down

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