A couple questions on the 12 bolt from a Jeep guy

[Timmay]

Here's the deal, I have an '00 Cherokee (XJ) and a D44 front from a J10 (same as a waggy). After a little research here I realized that the toyota 8" would be a great match for it. Unfortunatly the minitruck axles are far too narrow for my XJ's spring width. Then I found out about the Isuzu 12 bolt.

Here's what I think I know. Please correct me if any of this information is wrong.

'92-'97 12 bolts are 61" wide, if the trooper didn't have fender flares. With flares it is 63" WMS to WMS.
3.5" axle tubes
Disc brakes
1.3"? axle shafts
4.55:1 gearing, most of the time. (how can I tell between that and 4.30s without pulling the third member?)

Here's what i'd like to know:

Will this axle hold up well to my 4.0 with a healthy right foot and 35s, lincoln locked? I plan for a 4.6L stroker and 37s down the line, what about then?

Are there any alloy shafts offered for this axle? I know aftermarket support is slim, but that's okay, because in stock form it fits my needs perfectly.

Is there any way to adapt a 1310 ujoint (my stock style driveshaft) to the pinion flange on the 12 bolt? What size joint comes in the stock trooper?


That's all I can think of about the 12 bolt right now.

Another isuzu question regarding the Rodeos.

I'm pretty sure I read that they also came with 4.56s in their rear 44s and that the gearset is a thick version, much like the Jeep Rubicons. Would it be possible to run this thick gearset in my waggy44 with a 3.73 and down carrier? It came stock with 2.72s so the pinion is huge, therefore the thick gearset would make sense. I just need to make sure the D44s aren't some bastard version in the Rodeos. Any specific years and/or drivetrain combo's to look for for the 4.56 gears in rodeos?


Sorry for the hellishly long post but I figured i'd ask questions before I roamed the junkyard without much of a clue. I was at Harry's U Pull It in hazleton today and its packed with Isuzu stuff. Perfect for me. :D


Thanks again,
Tim

[Andre75]

I don't have much experience with the 12-bolt, but I can tell you that the Rodeo D44 from the 91-97 Rodeo is pretty standard, and can be found with 4.10 or 4.30 with the thick ring gear. The 98+ axle uses an oddball pinion size, but can be made to work with standard gears. 4.56's were not an option in the Rodeo with D44 to my knowledge.

[Timmay]

I don't have much experience with the 12-bolt, but I can tell you that the Rodeo D44 from the 91-97 Rodeo is pretty standard, and can be found with 4.10 or 4.30 with the thick ring gear. The 98+ axle uses an oddball pinion size, but can be made to work with standard gears. 4.56's were not an option in the Rodeo with D44 to my knowledge.

Ahh that saves me a lot of trouble. Thanks. :smokin:

[lttlbddy]

Not to many have ever broken the Isuzu 12-bolt. I know some that are behindhealthy V8s. Some have been lincoln locked and seem to hold up okay. They are stronger than a d44 and ABOUT the same as a ford 9.

Which gears? Spin the brake rotor and count revolutions of the pinion? If you mark the pinion you should be able to tell the difference between a 4.3 and a 4.55.

Not sure on the u-joint size or ability to change the yoke. There have been some posts in this forum on that subject before though.

[DirtyComanche]

Unfortunatly, search has been disabled for the lowly members.


That's the only reason I've actually been making ANY posts.


I NEED to know what I can do about that flange on the 12B pinon.

[Timmay]

Unfortunatly, search has been disabled for the lowly members.


That's the only reason I've actually been making ANY posts.


I NEED to know what I can do about that flange on the 12B pinon.

I sent Jesse at High angle an email. BrettM got his adaptor for his yota 8" from him and said it was about $40 and was a pretty beefy peice. I'm thinking the yota and the isuzu have very similar if not exactly the same flange on the pinion. If Jesse doesn't respond tomorrow i'll give him a call and see what he can do for us.

Good to see another jeep guy looking at this axle, it seems to be the PERFECT swap for a waggy44 front and 35s. I wouldnt be suprised to see it become more common after we do it and post pics.

[lttlbddy]

Who need a red star:

http://www.pirate4x4.com/forum/showthread.php?t=460901

[Timmay]

Awesome link! Thanks a lot. That solves that issue.

[DirtyComanche]

Booya.


Gotta hand it to you isuzu guys for bearing with us when we're hacking up your shit.

[lttlbddy]

There are a few Jeep parts hanging under Isuzus too. The fact is, no one breaks Isuzu 12 bolts, so it's not like any of us see the need for the spare parts.

[Timmay]

There are a few Jeep parts hanging under Isuzus too. The fact is, no one breaks Isuzu 12 bolts, so it's not like any of us see the need for the spare parts.

Thats good to know. I plan to pick up a spare third member and shafts just in case. I'll probably leave the spare open so if I feel the need to swap it in for the winter I can.

Is the 1st gen third member the same as the second gen? Like one say from an '88 and one from a '94, same thing? I know the shafts will be different, but what about the third?

[lttlbddy]

The thirds should all be the same except for the 98+Troopers that have the modified 12 bolt with the bigger ring gear.

88 and 94 should be no problem. As you mentioned just match up your axle lengths and you should be good to go.

[Timmay]

I don't have much experience with the 12-bolt, but I can tell you that the Rodeo D44 from the 91-97 Rodeo is pretty standard, and can be found with 4.10 or 4.30 with the thick ring gear. The 98+ axle uses an oddball pinion size, but can be made to work with standard gears. 4.56's were not an option in the Rodeo with D44 to my knowledge.

According to this link:

http://isuzu4x.com/modules.php?name=Content&pa=showpage&pid=21

The Rodeo 44s came with 4.56s in the 4 cyl models. Can anyone verify this? I'd love to use the thick gearset off of a rodeo on my existing carrier...



The thirds should all be the same except for the 98+Troopers that have the modified 12 bolt with the bigger ring gear.

88 and 94 should be no problem. As you mentioned just match up your axle lengths and you should be good to go.

That's what I figured. Thanks a lot. Looks like third members will be a dime a dozen here, there's 1st gens all over the place.

[Locomigo]

The only D44 gear ratio I am aware of are:
4.10
4.30
4.77

The 98+ have the thicker carrier/gearset. Not certain of the prior years.

The 4.56 were out of the 12 bolt.

[Andre75]

The Rodeo 44s came with 4.56s in the 4 cyl models. Can anyone verify this? I'd love to use the thick gearset off of a rodeo on my existing carrier...


I think that the 4cyl model might have had a GM10-bolt, but I'm not sure of that. The thick 4.56 R&P for the D44 should be readilly available. I know Matt at Independent4x.com carries them.

[Smiley]

Booya.


Gotta hand it to you isuzu guys for bearing with us when we're hacking up your shit.

Call me an optimist, but I envision a day when the currently fashionable trail comment “How in the #@&$ did you get that Isuzu UP HERE!?!” is replaced by “Hey man, nice Isuzu… Has anyone called ‘Dibs’ on your rear axle yet?”

:laughing: :laughing: :laughing:


Cheers!
Smiley

[Timmay]

I think that the 4cyl model might have had a GM10-bolt, but I'm not sure of that. The thick 4.56 R&P for the D44 should be readilly available. I know Matt at Independent4x.com carries them.

I know I can get thick 4.56s without a problem. But junkyard parts are awesome. :smokin: I already have a regular set of 4.56s so I'll just run them with a new carrier if the rodeos didn't come with the thick set.

[DirtyComanche]

Are the 12B to 1310 flanges spicer parts? Anybody have a number?

I looked in the jyard for a flange, there was nothing. The moron at Lordco didn't feel like trying to help me (Izusu, what?).

[Timmay]

Are the 12B to 1310 flanges spicer parts? Anybody have a number?

I looked in the jyard for a flange, there was nothing. The moron at Lordco didn't feel like trying to help me (Izusu, what?).

That's what I gathered... That the flange is a spicer peice. I'm going to the yard soon, if I find more than one i'll grab it for you.

[DirtyComanche]

Don't bother, the shipping will be as much as they are new.




(I live in the great white north)



As long as it's a spicer part, I can get it easily (cheap).

[Timmay]

Ah I gotcha. If I find one i'll check for a part number on it then. Maybe someone on here can look under their rigs for us? It'd be nice to have that handy...

[dig'umz]

The only thing on mine says spicer on one side and c2-2-721 or G2-2-721. Thats from a 95 rodeo 2wd auto. Mines going in a 89 yj.