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Unread 02-02-2011, 10:04 AM   #1
Logant
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Axle help

I have a 97 Tj sport with a Dana 44 rear and a 30 up front.. Just wondering if that is a good/rare combo cause I don't see a whole lot on here, thanks! Any info is appreciated

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Unread 02-02-2011, 10:12 AM   #2
05TurboS2K
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dime a dozen.

Decent setup for 33" locked or 35" open.

To upgrade:
D44 rear could probably survive 35" locked but I'd generally reccomend and upgrade to a super 44 kit and then a HP front 30.
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Unread 02-02-2011, 10:13 AM   #3
freeskier93
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Yes, from the factory that's a good combo. You can run up to 35s without any mods to the axles. Of course with 35s other things should be done as well. Upgrade the axles to a super 44 or HPD30 and you will probably be set for life.

Really the only next step for axles would be ford 9 or d60s, which are some serious axles.
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Unread 02-02-2011, 10:16 AM   #4
Logant
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I know the 44 is what people want basically but how is the 30? DD with trails every now and then nothing major.. 2.5 inch RC lift
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Unread 02-02-2011, 10:18 AM   #5
freeskier93
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Quote:
Originally Posted by Logant View Post
I know the 44 is what people want basically but how is the 30? DD with trails every now and then nothing major.. 2.5 inch RC lift
Because the front axle doesn't see as much abuse the D30 is actually a pretty good axle.

For about 600 bucks you can upgrade it to an HPD30 which I believe makes it 20% or so stronger.
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Unread 02-02-2011, 10:39 AM   #6
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What would the stock gearing be?
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Unread 02-02-2011, 10:47 AM   #7
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Quote:
Originally Posted by Logant View Post
What would the stock gearing be?
stock gearing for the HPD30 found in XJ's are the following ratios, this can all be searched however, this is a very common topic, but I've asked questions before that could have been searched so here ya go:

3.07 - used with 4.0L engine / manual transmission
3.31 - only available on older (pre87?) 2 door XJs with "Fuel Economy" package
3.55 - used with 4.0L engine / automatic transmission
3.73 - found in some XJs with the towing package
4.10 - used with 2.5L engine usually, and older XJs with the "Off-Highway Vehicle" package.
4.56 - rare but can be found on some older (~ 89 ~) models with 2.5L engine and auto transmission

EDIT! sorry you have a 1997 so this may not be true *the gearing in TJs with the D30/D44 combo is most likely 3.73 if thats what you were asking also*
http://www.jeepforum.com/forum/f9/st...1/#post4118404
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Unread 02-02-2011, 10:48 AM   #8
freeskier93
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Based on year it could be 3.07, 3.55, or 4.10/4.11. Because it a D44 I would lean more towards the 4.10/4.11. I'm actually not sure because the the D44 in the 1997 sport was a factory option and is pretty rare.

Here are some great links you should read:

http://www.jeepforum.com/forum/f9/st...1/#post4118404

http://www.jeepforum.com/forum/f9/st...1/#post4118404

http://www.jeepforum.com/forum/f9/tj...9-11-a-615132/

http://www.jeepforum.com/forum/f9/tj...embers-722109/

The first link it gives you information about stock ratios, then at the bottom there is a link that will tell you how to determine your ratios for sure.
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Unread 02-02-2011, 11:03 AM   #9
BlakJeep
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Quote:
Originally Posted by freeskier93 View Post
Based on year it could be 3.07, 3.55, or 4.10/4.11. Because it a D44 I would lean more towards the 4.10/4.11. I'm actually not sure because the the D44 in the 1997 sport was a factory option and is pretty rare.
I believe its only the rubi d44 that has 4.10/4.11, but yes definately read, helps out a lot down the road. Gears are often changed so unless your the original owner you may want to check the "for sure" way to tell your gear ratio as freeskier said
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Unread 02-02-2011, 11:36 AM   #10
freeskier93
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Quote:
Originally Posted by BlakJeep View Post
I believe its only the rubi d44 that has 4.10/4.11, but yes definately read, helps out a lot down the road. Gears are often changed so unless your the original owner you may want to check the "for sure" way to tell your gear ratio as freeskier said
Yeah its kinda confusing, because based on year those are the ratios they would be. And 1997 the Rubi wasn't created yet and the D44 was a pretty rare axle because it was factory option.

OP, there should be a tag on the differential that gives the gear ration. If it's missing or unreadable there are a couple other methods outlined int the FAQ. Here's the direct link to figuring out your axle ratio:
http://www.jeepforum.com/forum/f9/fa...-ratio-615380/
There are a couple mathematical ways to do it.

Now I'm really curious to find out what ratio it is.
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Unread 02-02-2011, 01:12 PM   #11
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D44/HP30 combo locked on 35" tires will survive just fine.

For added security add in chromos on both ends and go wheel.

I wheel on 35" tires on a stock/locked HP30 and a Super35 kit with ARB...I have yet to break anything.

My buddy wheels on a stock/locked D30 and stock/locked D44 on 35" tires with much success.


I can't make a guess as to your stock gearing. BUT you can jack up the front axle off the ground and count revolutions of the driveshaft while making a complete revolution of the tire.
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Unread 02-02-2011, 02:12 PM   #12
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alright thanks guys! i dont know if i will go to 33s just because of the power issuue.. i just dont wanna lose my top end power going down the highway
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