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Unread 01-05-2013, 10:14 PM   #1
Yamajer
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Mod 12 bolt isuzu vs d44

Doing a 6 lug swap in the Yj and leaning toward the modified 12 bolt trooper axle. Has anyone got any educated opinions between the d44 and a 12 both. (Both Isuzu)

The 12 bolt will be a 98 and newer for the larger ring gear and axle shafts. I know about the aftermarket support on the 12b is limited at best bit they are brutes. The rodeo d44 has alot in common with the standard 44 so I get all that.

My plan is with the axle swap (waggy front btw) to run 35's until I do my body lift then have 37's. Locking hubs up front with a spool and welded spiders if I do the 12b.

I do like the ground clearance I keep wight the 12b. As apposed to a 14 bolt GM.

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Unread 01-06-2013, 08:23 AM   #2
jason m
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Quote:
Originally Posted by Yamajer View Post
As apposed to a 14 bolt GM.
I dont know the semi float 14 bolts are very tuff axle's, 9.5" ring same, 6 lug pattern and the same WMS as the 12 bolt.

Didn't know Chevy still used the 12 bolts even in the newer trucks thought they were a 10 bolt axle.

Jason.
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Unread 01-06-2013, 11:18 AM   #3
Yamajer
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The 14 bolt GM is a 8 lug axle and full width. I'm staying as close to 60" as possible.

The Isuzu 12 bolt is nothing similar to the GM 12 bolt. Isuzu 12B is a third member axle similar to a ford 9".
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Unread 01-06-2013, 01:14 PM   #4
jason m
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Quote:
Originally Posted by Yamajer View Post
The 14 bolt GM is a 8 lug axle and full width. I'm staying as close to 60" as possible.
But the 6 lug semi float 14 bolt is what I thought what you were talking about, thats the one im refering too.

I had its big brother for yours and its a beast, great axle.

Jason.
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Unread 01-06-2013, 07:13 PM   #5
Yamajer
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I've seen so any ppl talk more about the FF14bolt... what are the SF 14 bolts from?

If not mistaken arnt they from late 80's heavy half tons? You have the FF 14B? Just hate the ground clearance issues, the shave is nice but by the time I gear it, shave it and get the axle I'm at where I would be with the 12b Isuzu and my d44 front done. 2 for 1 with money...

Thanks
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Unread 01-07-2013, 04:13 PM   #6
foggybottombob
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Chevy 14 bolt 9.5" semi float axles are from the 2500 series trucks. These are the 3/4 ton Chevys. I see them in the junkyards a lot. Axle shafts are 33 spline on these so that should handle a 37" tire fine.
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Unread 01-07-2013, 08:30 PM   #7
Yamajer
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Good thanks bob! Are they in both 2 and 4 wd? That would be a good option. I haven't had a chance to look into them more from both you and Jason's post with the recommendations ill def read up on them. It seems like there would be more aftermarket support for it.
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Unread 01-08-2013, 06:11 AM   #8
Yamajer
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After looking at all the details on them the major drawback is the width.

The axle shafts are smaller than the Is 12b by almost a .25" in dial as well. While there are some positives for the SF 14 I just don't think they out weigh the mod 12b for my application.

Thank you both for the added knowledge about this axle though. That will come in handy here real soon for a friends light build!
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Unread 01-08-2013, 02:13 PM   #9
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Do you have any links to posts about the Isuzu 12 bolt axle? I'd like to learn some more about it. Thanks!
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Unread 01-08-2013, 02:41 PM   #10
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Here was one of the most helpful.

http://www.zu4x.com/modules.php?name...howpage&pid=21

There was a ton though when I goodle'd modified 12 bolt isuzu axle. A few guys on here had a post but most were Isuzu forms.

They are lower spline count shafts but there are tons of guys running these with 37's all day and heavy s.p.r. (Fire fighter acronym : Skinny Pedal on the Right)
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Unread 01-08-2013, 03:52 PM   #11
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Quote:
Originally Posted by Yamajer View Post
Here was one of the most helpful.

http://www.zu4x.com/modules.php?name...howpage&pid=21

There was a ton though when I goodle'd modified 12 bolt isuzu axle. A few guys on here had a post but most were Isuzu forms.

They are lower spline count shafts but there are tons of guys running these with 37's all day and heavy s.p.r. (Fire fighter acronym : Skinny Pedal on the Right)
Thanks! I didn't see the gear ratios I would need for my rig, but it's still a neat option for those it will work for!
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Unread 01-08-2013, 04:05 PM   #12
Yamajer
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Ya that is the downside for them. They have three options.... what ratio are you running?
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Unread 01-08-2013, 04:44 PM   #13
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Quote:
Originally Posted by Yamajer View Post
Ya that is the downside for them. They have three options.... what ratio are you running?
I'm running 4.88's in a 8.8 and HPD30 atm, but I'd like to run steeper in similar sized axles.
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Unread 01-08-2013, 04:53 PM   #14
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You can do I think 5.13 or 5.38's with the 12b. What do you plan to do up front for a axle?
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Unread 01-08-2013, 06:17 PM   #15
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Quote:
Originally Posted by Yamajer View Post
You can do I think 5.13 or 5.38's with the 12b. What do you plan to do up front for a axle?
I didn't see that in the earlier links posted. Maybe I didn't look in the right spot?

Right now I'm running an HPD30 up front with a Ford 8.8 rear axle, 4.88 gears and 37x14.50r15 Swamper Irok bias plys.

I have an HPD60 king pin axle in the garage that I might build, but I'm not sure I want to go down that road just yet. I might cut up the D60 and build a hybrid HPD44 front axle and a HPD60 rear axle. I'm still doing research ATM...
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