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post #1 of 11 Old 12-07-2008, 05:39 PM Thread Starter
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Axle questions

So I'm cruising the forum and notice some guys running up to 37" tires on D30's. I know I have heard you need D44 or D60 for 37" or bigger from various people. My question is what makes the D44's or D60's stronger than the D30/35's? Is it tube thickness, shaft strength, gears?

I have also seen a axle sleeve mod. Does this along with gussets help running bigger tires?

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post #2 of 11 Old 12-07-2008, 05:53 PM
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Quote:
Originally Posted by H8T2W8T View Post
So I'm cruising the forum and notice some guys running up to 37" tires on D30's. I know I have heard you need D44 or D60 for 37" or bigger from various people. My question is what makes the D44's or D60's stronger than the D30/35's? Is it tube thickness, shaft strength, gears?

I have also seen a axle sleeve mod. Does this along with gussets help running bigger tires?
All of what you said is correct. A dana 44's ring gear is larger than a d30 and a d60 ring will be larger than both. The larger ring gear takes less strain than a smaller ring gear and more important the pinion gear is also larger in the bigger axles. When you move to a lower gear ratio higher numeric the pinion gear gets smaller which will be easier to break. The axle tubes will be thicker and in most cases larger in diameter which increases the strength of the axle. I have the axle sleeve kit in hopes to strengthen the tubes and inner C gussets to help strengthen the inner C's. Shaft diameter is also going to increase with larger axles assemblies which helps as well. I don't think you need a dana 60 to run 37's just a well strengthened housing and good shafts, IMO.


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Last edited by bodyguy; 12-07-2008 at 05:58 PM.
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post #3 of 11 Old 12-07-2008, 06:24 PM
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i would say you want dana 44s for any thing over stock tire sizes. 37s is probly the limit for the 44. any thing over 37s should probably go to dana 60 or 70

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post #4 of 11 Old 12-07-2008, 07:09 PM
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bigger, stronger shafts (bigger, more spline count) is the main part. in some instances, the tubes are thicker and larger, but not always. larger knuckles.

gears usually are not the weak point of an axle/diff. something else usually breaks before ring and pinion blow up. sometimes a diff or R&P will become collateral damage when something else breaks first, though.

with the old D44's, 37's is often pushing it (depending on the driver of course). with the JK Rubicon D44's, 37's are rarely a problem. swap in chrome-moly shafts and do a little gusseting, and the JK Rubicon 44's are practically as strong as a D60.

35's on a D35 can have bad results. D30's can usually survive 35's, with some simple upgrades and a prudent driver.
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post #5 of 11 Old 12-07-2008, 07:47 PM
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with all the money upgrading a dana 44 id rather pull a 60 or 70

Thats ill cause they act a different way with me
I feel like no body wanna playa with me
thats real cause they treat me
like a stain on their clothes
they treat me like i got a red nose
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post #6 of 11 Old 12-07-2008, 09:43 PM
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Quote:
Originally Posted by White Widow View Post
with all the money upgrading a dana 44 id rather pull a 60 or 70
a thousand bucks is nothing like the price of a D60

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post #7 of 11 Old 12-08-2008, 05:32 AM
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You can pull Dana 60s out junkyards here in denver for 2 or three hundred bucks

Thats ill cause they act a different way with me
I feel like no body wanna playa with me
thats real cause they treat me
like a stain on their clothes
they treat me like i got a red nose
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post #8 of 11 Old 12-08-2008, 06:37 AM
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Quote:
Originally Posted by White Widow View Post
You can pull Dana 60s out junkyards here in denver for 2 or three hundred bucks
True, but putting junk yard axles in to a brand new vehicle just doesn't feel right to me. Besides, by the time you've cut them down, most likely re-geared, bought new rims, etc, etc, you'll be way passed $300-400.

The JK 44's have pretty well proven they can handle 37's just fine. Some extra strengthening here and there and you have some pretty solid axles.
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post #9 of 11 Old 12-08-2008, 09:22 AM
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Originally Posted by PhilD View Post
True, but putting junk yard axles in to a brand new vehicle just doesn't feel right to me. Besides, by the time you've cut them down, most likely re-geared, bought new rims, etc, etc, you'll be way passed $300-400.

The JK 44's have pretty well proven they can handle 37's just fine. Some extra strengthening here and there and you have some pretty solid axles.
this is true. i guess i have 40s in eyes for the future. trailer jk most likely

Thats ill cause they act a different way with me
I feel like no body wanna playa with me
thats real cause they treat me
like a stain on their clothes
they treat me like i got a red nose
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post #10 of 11 Old 12-08-2008, 12:20 PM
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Mt Logan Off Road axle sleeve kit + Off Road Evolution axle gusset kit + a few welds here and there =

ONE STRONG ASS DANA 44 FRONT AXLE!
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post #11 of 11 Old 12-08-2008, 12:34 PM
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Quote:
Originally Posted by White Widow View Post
You can pull Dana 60s out junkyards here in denver for 2 or three hundred bucks
if you have the ability to cut them down (or leave them full-width, i guess) and fabricate new mounts for control arms and track bars, etc....i guess this would work.

most people with JK's can't.
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