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Old 01-01-2011, 01:05 PM   #1
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Question dana 30 and 35 with 33s

i have a dana 30 3.07 on the front and dana 35 3.78 on the rear i am about to put 33s on my tj now do i need to upgrade the front now since i will be mainly using it on road? thanks

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Old 01-01-2011, 01:08 PM   #2
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You have a 3.07 ratio in the front and a 3.73 ratio in the rear? How did that happen? When you say "upgrade the front", do you mean do you need to regear it so the ratio matches the rear?

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Old 01-01-2011, 01:08 PM   #3
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Why do the gear ratio's not match? For just street running you don't need to upgrade. Though the gears need to match for use of 4wd.
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Old 01-01-2011, 01:19 PM   #4
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You have a 3.07 ratio in the front and a 3.73 ratio in the rear? How did that happen? When you say "upgrade the front", do you mean do you need to regear it so the ratio matches the rear?


i looked at the tj's axle identification's thread http://www.wranglerforum.com/f5/tj-l...ion-50307.html and as well as the manual stated that's but then again this is a sport model trail rated version i tried to look at the plate in the front but didn't find any but i saw the one at the back and yes the questions is if i needed to regear the front now to match the back thanks
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Old 01-01-2011, 01:24 PM   #5
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Well, the axles don't come geared differently so based on that I doubt your axles are geared to two different ratios. Whatever the tag on the back axle says is your ratio for both axles. What transmission and engine do you have?
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Old 01-01-2011, 01:33 PM   #6
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Well, the axles don't come geared differently so based on that I doubt your axles are geared to two different ratios. Whatever the tag on the back axle says is your ratio for both axles. What transmission and engine do you have?
i hope so because it doesn't make sense to me at all but then again i am a newbie on these all i do is just the normal preventative maintenance and just now looking into upgrading so i have a lot of questions sorry people just bare with me a little while longer and i will look at it more later to see exactly the number but i do know that i have np231j t-case
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Old 01-01-2011, 01:36 PM   #7
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Here's where to look for your axle ratio. The ratio on that tag indicates that axle has a 3.73 ratio.

You didn't answer the question on what engine and transmission you have.
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Old 01-01-2011, 01:38 PM   #8
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Well my guess will be they match. If your just going to drive around town you don't persay have to change anything. you will notice a loss of power/acceleration with the larger tires.

You can if you want consider a gear swap for the front and rear axle to compensate for the larger tires. Cost runs between 1000-1500(total) at most places. However there are other things to consider as you may not want to invest that kind of money into the dana 35 as its a weaker axle vs the dana 44 that also came on the TJ.
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Old 01-01-2011, 01:47 PM   #9
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Here's where to look for your axle ratio. The ratio on that tag indicates that axle has a 3.73 ratio.

You didn't answer the question on what engine and transmission you have.

i have 4.0 6speed manual thanks
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Old 01-01-2011, 01:50 PM   #10
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For the 6-speed, 4.10 is a very good choice for 33" tires. If you find out you have the 3.73 ratio, it's probably not worth it to regear since there's not that much difference between 3.73 and 4.56. If you have the 3.07 ratio, you definitely should regear for your new tires.
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Old 01-01-2011, 02:03 PM   #11
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For the 6-speed, 4.10 is a very good choice for 33" tires. If you find out you have the 3.73 ratio, it's probably not worth it to regear since there's not that much difference between 3.73 and 4.56. If you have the 3.07 ratio, you definitely should regear for your new tires.
well i know for a fact that the rear is 3.78 i saw that plate but the front i haven't yet but i will later i'm just being lazy to get underneath to look so what of this ford 8.8? thanks
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Old 01-01-2011, 02:08 PM   #12
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It's not a 3.78, it's a 3.73.
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Old 01-01-2011, 02:11 PM   #13
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It's not a 3.78, it's a 3.73.
Just what I was thinkin! beat me to it Jerry!
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Old 01-01-2011, 02:26 PM   #14
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It's not a 3.78, it's a 3.73.
i was trying to type and do other things at the same time playing this game online hehehe well i can't deny that i am a newbie on certain things well a lot of things
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Old 01-12-2011, 09:42 PM   #15
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I have the same problem. My 3.07 geared rear end went out, and I replaced it with a used rear end with a 3.73 ratio. What a difference it made driving around. But now my front and rear don't match.

After this ridiculous snow storm Atlanta was just saddled with I would like to be able to use my 4wd again. Is it even worth it to regear my front stock axle on a 2003 X? I assume it's a Dana 30. If not then can anyone suggest any alternatives that don't cost many hundreds of dollars. I don't do any significant off-roading. My jeep would be looked upon with shame by most of you I would assume, but it lives in the city... :-)
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Old 01-12-2011, 09:45 PM   #16
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Quote:
Originally Posted by ehron
I have the same problem. My 3.07 geared rear end went out, and I replaced it with a used rear end with a 3.73 ratio. What a difference it made driving around. But now my front and rear don't match.

After this ridiculous snow storm Atlanta was just saddled with I would like to be able to use my 4wd again. Is it even worth it to regear my front stock axle on a 2003 X? I assume it's a Dana 30. If not then can anyone suggest any alternatives that don't cost many hundreds of dollars. I don't do any significant off-roading. My jeep would be looked upon with shame by most of you I would assume, but it lives in the city... :-)
Needs to be regeared for 4wd. A D30 is worth the regear, especially if it lives in the city.
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Old 01-12-2011, 10:17 PM   #17
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LOL. Thanks for the reply. I feel compelled to state that I understood it needed to be regeared before asking if a Dana 30 was worth spending money on. I would imagine my front and rear wheels turning at different rates won't produce favorable results...
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Old 01-14-2011, 05:57 PM   #18
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LOL. Thanks for the reply. I feel compelled to state that I understood it needed to be regeared before asking if a Dana 30 was worth spending money on. I would imagine my front and rear wheels turning at different rates won't produce favorable results...
Especially on ice.....there is no way that it will track straight for more than 2 feet that way.

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Old 01-14-2011, 06:54 PM   #19
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I installed my rear axle with 4.88's, before I even moved the jeep, I removed the front driveshaft. I drove it to the gear shop to have my frot 4.88's installed. I am not certain, but I thought for sure that the xfer case cannot hack different gears even if you stay out of 4WD.... am I right? Or did I proceed with too much caution?

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