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Old 08-24-2012, 08:33 AM   #1
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Rubicon 44 or dana 30 front axle

A guys need help which would be better sooner or later I want to put 37 on my jeep I'm going after hunting and putting 35 do I find a Dana 44 from a rubicon or just beef up the Dana 30 please help

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Old 08-24-2012, 11:09 AM   #2
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A guys need help which would be better sooner or later I want to put 37 on my jeep I'm going after hunting and putting 35 do I find a Dana 44 from a rubicon or just beef up the Dana 30 please help
The general consensus on most jeep forums is that you can run 35s on either axle reliably, especially if you beef them up with alloy shafts, but 37s would be pushing the limits of both axles. You should look to something stronger (and more expensive) to reliably run 37s.

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Old 08-24-2012, 11:16 AM   #3
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The only difference between the rubi44 and the stock 30 is the ring and pinion size...everything else (tubes, shafts, etc) are the same. Like Border Dave said, you would be much better off looking into something stronger to handle the 37s reliably.
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Old 08-24-2012, 11:25 AM   #4
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The only difference between the rubi44 and the stock 30 is the ring and pinion size...everything else (tubes, shafts, etc) are the same.
I'm sure you were talking about the outer stub shafts being the same size, but I just wanted to mention the Dana 44 does have larger 30 spline inner axle shafts, whereas the Dana 30's are only 27 spline.
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Old 08-24-2012, 11:39 AM   #5
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I'm sure you were talking about the outer stub shafts being the same size, but I just wanted to mention the Dana 44 does have larger 30 spline inner axle shafts, whereas the Dana 30's are only 27 spline.
Correct. Even though the spline count probably isnt the biggest worry anyways since the weak point on the D30 is the the U-joint before anything else...so I would assume the same applies for the D44.
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Old 08-24-2012, 12:01 PM   #6
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Yep the Rubicon has a 30 spine inner shaft but its u-joint and 27 spline outer shaft is the same as the D30's. Same with the axle tubes, knuckles, ball joints, brakes, etc. are all D30.
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Old 08-24-2012, 12:51 PM   #7
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ford 9"
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Old 08-24-2012, 12:57 PM   #8
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I neglected to mention that for all practical intents and purposes, it is impossible to beef up the Rubicon D44 or D30 front axles sufficiently to hold up to 37" or larger tires if you wheel in conditions tough enough to require 37" or larger tires.
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Old 08-24-2012, 01:23 PM   #9
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you could always find a jk rubi44. Sleeve it and it should hold 37's fine. Good luck bud
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Old 08-24-2012, 01:38 PM   #10
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you could always find a jk rubi44. Sleeve it and it should hold 37's fine. Good luck bud
Better get them as a set then...the JK axles are wider than the TJ axles.
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Old 08-24-2012, 02:56 PM   #11
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Better get them as a set then...the JK axles are wider than the TJ axles.
Ya I was looking at that to
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Old 08-24-2012, 06:04 PM   #12
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How much wider
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Old 08-24-2012, 07:04 PM   #13
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even if you upgrade to the RCV shafts the D44 is not strong enough for 37s?
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Old 08-24-2012, 07:06 PM   #14
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even if you upgrade to the RCV shafts the D44 is not strong enough for 37s?
You can make the shafts more than strong enough, it's the rest of the front Rubicon D44/D30 axle that isn't up to that big of a tire as was described in post #6 above. And add to that the inner & outer C's... not strong enough for anything bigger than 35" tires if you wheel on trails that require tires bigger than 35".
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Old 08-24-2012, 09:03 PM   #15
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You can make the shafts more than strong enough, it's the rest of the front Rubicon D44/D30 axle that isn't up to that big of a tire as was described in post #6 above. And add to that the inner & outer C's... not strong enough for anything bigger than 35" tires if you wheel on trails that require tires bigger than 35".
Gotcha. I asked because of different rigs I have seen like that. 37s d44 with the rcv. I'm personally happy with my 33s here in Maryland and the mid Atlantic region. But I want to know about strengths and capabilities because it seems that once I move to the west coast ( san Diego area ) I would like to be able to run 35s and harder trails.
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Old 08-24-2012, 09:20 PM   #16
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So how good is the Dana 44 I have in the rear
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Old 08-24-2012, 09:41 PM   #17
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So I guess I'm asking I what will I need for 37 do I need to get a new rear axle to is that Dana 44 not very well built to if so what would you recommend and thanks for helping so far
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Old 08-24-2012, 10:58 PM   #18
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So I guess I'm asking I what will I need for 37 do I need to get a new rear axle to is that Dana 44 not very well built to if so what would you recommend and thanks for helping so far
The rear factory Dana 44 only has .25 inch wall tubes. In order to run 37s, I would think you'd want a good axle housing truss, cryo'd ring and pinion, 33 spline alloy shafts, and a bit of luck. Maybe someone else has input on the bearing strength.

Personally, if I were going to run 37s, I'd want to go with a complete Currie or Dynatrac axle assembly in the rear. If you can work with metal, you could put in a junkyard Dana 60, but it'd take quite a bit of work if you didn't want to run full width axles.
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Old 08-24-2012, 11:41 PM   #19
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I don't know crap but I have a lot of friends that do lol
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Old 08-24-2012, 11:44 PM   #20
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I hear land cruiser has Dana 60 is that right
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Old 08-25-2012, 12:33 AM   #21
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How much wider
I think they're 4" wider but I could be mistaken
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Old 08-25-2012, 02:43 AM   #22
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So what will hold 37 I don't want to spend 2 to 3 grand on axles each if I don't have to
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Old 08-25-2012, 06:48 AM   #23
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Originally Posted by J33ps
So what will hold 37 I don't want to spend 2 to 3 grand on axles each if I don't have to
To answer ur question ur not going to be able to run 37s cheap, cheapest route is probably gonna be getting jk axles and trussing them as stated above but there are other things that go along with that as well that u will have to replace I'm not sure of them all but I'm sure someone here is, plus another big thing to worry about in axle swaps is making sure u have the right gears, and I doubt anything u find is going to have the gearing for 37s unless u get a currie or danatrac built axle, just fyi, so u have to factor that into the equation as well, hell I'm looking to move up the 35s and its gonna cost me a small fortune to do it right, 8.8 rear with a locker and gears, regear front axle, jj control arms, sye, bl mml tummy tuck, and a dc driveshaft, just to name a few, so I can't even imagine the cost to jump to 37s.
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Old 08-25-2012, 10:25 AM   #24
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I new all that I'm not putting them on right away I figured start with the axles put 35 on there then go from there
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Old 08-25-2012, 11:20 AM   #25
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I new all that I'm not putting them on right away I figured start with the axles put 35 on there then go from there
A rear Dana 44 and front Dana 30 is fine for 35" tires. It'd be uber-expensive to make a Jeep worthy of 37" or larger tires for difficult offroad use.
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Old 08-25-2012, 06:30 PM   #26
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Thanks everyone for ur help
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Old 08-25-2012, 10:28 PM   #27
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Old 08-25-2012, 10:54 PM   #28
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Jerry, I would like to have my O4 Rubi D44 sleeved and the C's gusseted, better Ball Joints with RCV's. I want to run 35's with out having to worry. Will that stand up?
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Old 08-25-2012, 11:14 PM   #29
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The only difference between the rubi44 and the stock 30 is the ring and pinion size...everything else (tubes, shafts, etc) are the same. Like Border Dave said, you would be much better off looking into something stronger to handle the 37s reliably.
How do you figure? The 44 has 30 spline axles, and the d30 has 27 spline axles.

If you're going to build a d30 to 30 spline, the outer shafts will still have 27 spline at the wheel hubs. Unless you spend $2,400 and get the full 30 spline, hub kit, and ARB locker, and gears.

ALLOY USA has a nice kit for $2,400

Front Grande 30 Axle Shaft Kit with ARB Air Locker, 92-06 Jeep Models

A lower cost way is just the axles, and maybe put a tru-trac in the front

http://www.alloyusa.com/conversion-k...usa-12232.html
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Old 08-25-2012, 11:33 PM   #30
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So what will hold 37 I don't want to spend 2 to 3 grand on axles each if I don't have to
It's not a matter what will work, you need to take into concideration stretching the wheel base, which calls for cutting the fenders, getting control arms that will stretch, fuel tank, spring, and shock relocation brackets, driveshaft work, brake line work.

37" is just asking to spend money. 35s can get you all the fun you need out of a jeep.

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