Jk Rubicon 4:10 gears vs. 1974 Chevy 4:10 gears (pics) - JeepForum.com
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Unread 12-03-2009, 09:44 AM   #1
Xtremjeepn
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Jk Rubicon 4:10 gears vs. 1974 Chevy 4:10 gears (pics)

I just happen to have both of these sets of gears laying here so I thought I would take some pictures for you guys.

(ignore the blue towel, my workbench is black so the pics of the black gears would be harder to see).

The left is a front 4:10 from a 2008 Rubicon. The right is a 4:10 from a 1974 Chevy 3/4 truck. Both front axles.
(and the dog fur is wolf hybrid, not cracks in the gears)









Ring gear bolts.



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Unread 12-03-2009, 10:03 AM   #2
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Finally, something where Chrysler DIDN'T cut corners.
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Unread 12-03-2009, 10:11 AM   #3
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So are the good? They look the same
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Unread 12-03-2009, 10:47 AM   #4
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Where’s the beef?
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Unread 12-03-2009, 11:12 AM   #5
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Well the JK uses a "thick" designed ring gear and the old skool your showing is a reg ring gear.

to honestly put apples to apples, you should have found a "thick" d44 ring gear to put it against.

But all in all, yes the JK D44 is a bit more brawn. not significantly but some..
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Unread 12-03-2009, 11:23 AM   #6
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Originally Posted by RWKHausSupply View Post
to honestly put apples to apples, you should have found a "thick" d44 ring gear to put it against.
There is no old school "thick" 4:10
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Unread 12-03-2009, 11:27 AM   #7
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Quote:
Originally Posted by Xtremjeepn View Post
There is no old school "thick" 4:10
Sure there is. ANY rubicon D44 TJ gear is a typ D44 RG that is "thick" and fits ANY d44 LP 3.73 and dn carrier. Hence thick 4.10 ratio RG.
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Unread 12-03-2009, 11:30 AM   #8
Xtremjeepn
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Originally Posted by RWKHausSupply View Post
Sure there is. ANY rubicon D44 TJ gear is a typ D44 RG that is "thick" and fits ANY d44 LP 3.73 and dn carrier. Hence thick 4.10 ratio RG.
I would not consider 2003+ "old school"
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Unread 12-03-2009, 11:35 AM   #9
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I would not consider 2003+ "old school"
Well there were a few factory's that did offer a thick D44 RG prior to 1997 for sure. It was more common to do a ring gear spacer though, back in the 80's and 90's. We sold many of them at Super Shops back then. But a few companys did offer a thick design way prior to 2003 though.
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Unread 12-03-2009, 11:45 AM   #10
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Ring gear spacers were a way to get around the carrier break for gear ratios. Use a deep carrier LSD but have a high ratio gear set. Cheaper to use a spacer.

The ring gear here is only part of the story anyway. The thickness of the pinion shaft and the size of the bearings (not pictured) is a massive difference.

Put them all toghether and you get one stout axle compared to what we used to consider "3/4 ton stuff" in an old truck.
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Unread 12-03-2009, 11:47 AM   #11
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Mmmm...beefy.
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Unread 12-03-2009, 11:50 AM   #12
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Quote:
Originally Posted by Xtremjeepn View Post
Ring gear spacers were a way to get around the carrier break for gear ratios. Use a deep carrier LSD but have a high ratio gear set. Cheaper to use a spacer.
Yep or a thick set...
Quote:
Originally Posted by Xtremjeepn View Post
The ring gear here is only part of the story anyway. The thickness of the pinion shaft and the size of the bearings (not pictured) is a massive difference.

Put them all toghether and you get one stout axle compared to what we used to consider "3/4 ton stuff" in an old truck.
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Unread 12-03-2009, 03:12 PM   #13
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Specs

http://dynatrac.com/images/pdf/New_G...ison_chart.pdf
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Unread 12-03-2009, 08:21 PM   #14
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My question is what caused the D44 gears to be liberated from the 2008 ruby?
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Unread 12-03-2009, 08:59 PM   #15
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I swapped in 5:13s
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