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Old 12-07-2012, 05:41 PM   #1
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TJ with Dana 35, verses JK Unlimited with Dana 44

What has been discussed in the past is that the Dana 35 does pretty well with the 2.5 engine, but is at risk with tires larger than 33s and a heavy throttle off road with the 4.0 engine, particularly if the Jeep gets into a bouncing axle shock load situation.
The Dana 44 does pretty well with the TJ 4.0 and the JK, which I believe is about 400 pounds heavier than the TJ and with the new more powerful 3.6 engine.
If everybody pretty much agrees with that being said, then what about the JK unlimited even yet much heavier with the 3.6 more powerful engine?
My question is the Jk Unlimited 3.6 engine with Dana 44 with lets say 35 or larger size tires, more likely to have the same type problem as the Tj 4.0 with a Dana 35, because of more weight and additional H Power? Should the JK Unlimited really have been specked out with a Dana 60?
I understand that most all of the above combinations will live with common sense and knowing when to get off of the throttle. But in the real world we know that doesn't always happen.
I WILL BE REAL INTERESTED IN HEARING YOUR OPINIONS ON THE ABOVE QUESTION.
There are lots of you that have extensive experience in Jeep power trains and I am trying to learn from your experiences.
JERRY I HOPE THAT YOU RESPOND TO THIS ONE!

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Old 12-07-2012, 05:44 PM   #2
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they will be fine with the 44, a lot of full size trucks have 44 rears and their heavy pigs

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Old 12-07-2012, 05:53 PM   #3
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The 3.6 does have more horsepower than the 4.0, however you won't be getting into the 280 or so range until you are close to redline, which I don't see happening, and I believe the 4.0 will be producing more torque in the range when you are rock crawling which you are most likely to break an axle. The 44 stands up to most rigs locked with 35s, so even though the JKU weighs more I don't see it needing a Dana 60 real end
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Old 12-07-2012, 06:14 PM   #4
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you gotta understand the JK D44 isn't really a D44. It's better and stronger. More like a D45. FWIW, some JK's did come with a D60 rear...ever heard of the J8?
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Old 12-07-2012, 06:18 PM   #5
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I can't believe that the rubicon JKU wasn't spec'd with Dana 60 rear and Dana 44 front axles. The new Pentastar engine is putting out the power and torque of a V8.. and if math actually works, those rear 44s on the much heavier JKU, along with 35's or 37's will twist just like a Dana 35 would do with 33s or 35s.. I've seen a lot more than a couple of JKUs that broke those 44s and the owners just replaced them with 60s instead of fooling around with trying to upgrade the 44s..
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Old 12-07-2012, 06:26 PM   #6
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I feel like it is very possible to break the d44 with a 12+ JKU with 35s or more likely 37s, however, it is not easy. All things considered it really comes down to the driving style. You can break nearly any axle that would normally be fine if you drive stupid enough. I don't think you need to work about the JKU with 35s. Locked and 37s would be another story in my opinion.
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Old 12-07-2012, 06:32 PM   #7
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Unlimited LJ04,
That is very interesting there being differences in the Dana 44s, between Jeep models and makes a lot of sense as to why they would still use a 44 in a JK Unlimited.
No, I am not familiar with a J8.
I currently have a 2003 TJ with a Dana 35 and a 2012 2DR Rubicon. My wife would like me to sell the both of them and purchase a 2013 Rubicon Unlimited so we have more room to hall items. I was concerned about the longevity of the rear axle with the additional weight and HP, eagle 223 made a good point about possible less torque from the 3.6 at low rpm when rock crawling.
My wife and I do go out a lot by ourselves and would prefer not to break down. Sometimes we are a 150 miles back in the woods and sometimes where we go there isn't anybody else for miles away and sometimes we are out of cell phone range. But it sure is a lot of fum!!!!!!!!!
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Old 12-07-2012, 06:32 PM   #8
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The dana 35 weakness is more about its weak axle shafts, being 27 spline and smaller in diameter than a dana 44(tj). You can upgrade to 30 splines and for alot of folks that is all they need. And you can upgrade the dana 44 to 33 spline shafts.. Of course as you upgrade a new weak link will step up. Axle tube, ring gear etc etc. Why no 60 in the standard JK line.. cost would be my guess. also the 60 in J8 is not the best design as i recall, c clip and some other quirks...

All that being said I enjoyed worry free willing for the most part when I ran my 60's.
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Old 12-07-2012, 06:40 PM   #9
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Quote:
Originally Posted by Old Dogger View Post
Unlimited LJ04,
That is very interesting there being differences in the Dana 44s, between Jeep models and makes a lot of sense as to why they would still use a 44 in a JK Unlimited.
No, I am not familiar with a J8.
I currently have a 2003 TJ with a Dana 35 and a 2012 2DR Rubicon. My wife would like me to sell the both of them and purchase a 2013 Rubicon Unlimited so we have more room to hall items. I was concerned about the longevity of the rear axle with the additional weight and HP, eagle 223 made a good point about possible less torque from the 3.6 at low rpm when rock crawling.
My wife and I do go out a lot by ourselves and would prefer not to break down. Sometimes we are a 150 miles back in the woods and sometimes where we go there isn't anybody else for miles away and sometimes we are out of cell phone range. But it sure is a lot of fum!!!!!!!!!
There are a whole bunch of differences in D44's across the decades they have been in use. The TJ D44 isn't the same as the D44 in a 70s F250, and neither are the same as a JK D44. Heck there are Dana 60's out there that have the same size shafts as a TJ's D44.

The JK Rubi D44 rear has bigger tubes, a bigger ring gear, bigger shafts/more spline count and the front's use bigger u-joints. that's why they're called "New Generation" Dana 44's.

Dana & Jeep want the name "Dana 44" for marketing. Don't consider the marketing name to be a correlation to strength.
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Old 12-07-2012, 06:44 PM   #10
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4JEEPN,

If I keep my TJ and go with up graded chromoly 4340 shafts and 30 spline side gears, then who makes the best quality ones? I am probably going to trade in my 2012 Rubicon on the 2013 R Unlimited, but really want to keep my TJ that only has 49,000 on highway miles on it.
Do you have a feel for the cost of the upgraded parts "shafts, side gears, bearings and seals" and labor?
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Old 12-07-2012, 11:16 PM   #11
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Quote:
Originally Posted by eagle223 View Post
The 3.6 does have more horsepower than the 4.0, however you won't be getting into the 280 or so range until you are close to redline, which I don't see happening, and I believe the 4.0 will be producing more torque in the range when you are rock crawling which you are most likely to break an axle. The 44 stands up to most rigs locked with 35s, so even though the JKU weighs more I don't see it needing a Dana 60 real end
Very true. Torque snaps axles, HP just makes is awesome
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Old 12-08-2012, 08:23 AM   #12
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Quote:
Originally Posted by Old Dogger View Post
4JEEPN,

If I keep my TJ and go with up graded chromoly 4340 shafts and 30 spline side gears, then who makes the best quality ones? I am probably going to trade in my 2012 Rubicon on the 2013 R Unlimited, but really want to keep my TJ that only has 49,000 on highway miles on it.
Do you have a feel for the cost of the upgraded parts "shafts, side gears, bearings and seals" and labor?
From days past superior axle has an nice product, but it depends on your budget. From a fast look the shafts appear retail to be around 900 or so, and add a locker your in the 1500+ range... that same thing a few years back was under 1k. I would check craigslist and auto-parts.com for used TJ dana 44's for that price. OR ECGS for a 8.8 build. The TJ 44 or the ecgs(or other maker) will just bolt in, bleed the brakes and your set for the most part.
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Old 12-08-2012, 10:49 AM   #13
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Quote:
Originally Posted by 4Jeepn View Post
From days past superior axle has an nice product, but it depends on your budget. From a fast look the shafts appear retail to be around 900 or so, and add a locker your in the 1500+ range... that same thing a few years back was under 1k. I would check craigslist and auto-parts.com for used TJ dana 44's for that price. OR ECGS for a 8.8 build. The TJ 44 or the ecgs(or other maker) will just bolt in, bleed the brakes and your set for the most part.
Thank you for the Info!

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