Isuzu Trooper axles width ?

[Berg]

Just doing some bench engineering and wondered about the width of 92-99 rear Trooper Axles..
anyone know what the WMS is?

..Are trooper v6 axles as strong as suggested..what are their weak points?
I grabbed this from the toyota forum .....
"how about an isuzu rear end?
On the general bored is a discusion of the trooper rear end, someone stated it was 1.5" shafts and disk brakes.

Quote: they have a DOHC 3.5L v-6 rated a little over 200 hp, the Isuzu trans/case and the late models have a Larger version of the rear axle called the Corp. 12 bolt.

this axle has 1.5" shafts and a ring gear roughly the size of a D60....and it is a 3rd member design.

right lug pattern. for chevy and Toyota
These might be an option for the Cruiser guys looking for a centered rear end ?

Bennett

[Joe_W]

I believe its right around 58" to 60". Hopefully Matt or someone will have exact width

[Locomigo]

Not certain of the wms but, as FYI...

The Trooper axles are a corp 12 bolt, and ARB are available.

The Rodeo/Amigo axles are 30 spline, semi-floating Dana 44, with 6 on 5.5 lugs, discs, and many locker choices.

[Independent4x]

yeah....good idea

the isuzu 12 bolt rear is a very underrated axle IMHO
the older ones....like 88-95 are a little narrower, i want to say 56" is what comes to mind....i'll try to get a real measure fore you.

the later ones (96-99) are a couple inches wider (ase the newer troopers got wider)

there is an ARB available for the early and late version.


RD44 - fits the 87-95's w/ 1.32" 26 spline axles

RD85 - fits the 98+ w/ 1.50" 23 spline axles


so early axles:

more common
narrower: 56" +/-
smaller shafts BUT....higher spline count
ring gear roughly sized like a Dana 44
locker: ARB
gears: 4.56, 4.77. 5.38


late ones:

little wider
little bigger brakes
larger shafts, BUT lower spline count
Larger ring gear - roughly like a 60
locker ARB
gears: 4.30's (i think) (5.38's available Internationally)


this is all right off the top of my head, i'll try to clarify if you need help.

[Nazrat]

The key to remember is that you can pick up an Isuzu axle for next to nothing, that will have disk brakes, 3rd member design, 4.56 gears (stock), arb locker availability, and the choice of leaf spring mounts or a 4-link coil spring setup.

The leaf spring variety are easier to find probably, since 88-91 Troopers and 89-94 Amigos all had them. 92-97 Troopers have the coil spring setup. All of these vehicles came with 4.56 gears. If you happen to find a Trooper with 4.77s, someone with an Isuzu will gladly swap you some 4.56s for them, and since it is a 3rd member design, the swap is trivial.

The 98+ Troopers also have 4-link coil spring setups, and the slightly stronger axle internals (that Matt described).

I don't know how much abuse the guys in Iceland have put the rear axles through, but they run some pretty large tires on them. They also sell 5.38 gears for the later axles. http://www.4x4mountainsport.com/modifications/isuzu/isuzu_800x600.htm

Tera sells 5.38 gears for the pre-98 Isuzu 12-bolt.

[Tuite]

The 98+ rear ends are fairly beefy with the 1.5" shaft and the ring gear is ~9.6" (I think).

The draw back is gearing and traction. All came with 4.30s and an LSD. The 5.38 are gonna cost you close to $400 from Iceland. They have a mechanical selectable locker too but it's around $1000.

[Hickeyjones]

Are the 12 bolt housings steel or cast or what?

[Kevin V]

From memory, my service manual (2001 Trooper) lists the ring gear diameter at 9.61 inches. The axle width is just shy of 63", WMS to WMS. Drop-out steel third member. Sorry, don't know type of steel (cast, forged, etc.)

As was mentioned earlier, the problem is gearing. For the 98+ axles, it's either stock 4.30's, or 5.38's from Iceland.

Hope this helps,
Kevin V

[houlster]

Originally posted by Hickeyjones
Are the 12 bolt housings steel or cast or what?

It's a 3rd member housing, so it's steel, not cast. The earlier narrow housings have 3" tubes. The later wider housings from the Troopers have 3.5" tubes.

--Dan

[houlster]

12 bolt Widths:

1st gen 12 bolts are all the same width. Matt said 56", but I think it's closer to 58". Axle tubes are 3". 8.7" or so ring gear. Ring gears are also substantially thicker than a 44 gear.

'89 - '94 Amigo
mid '88 - '91 Trooper


2nd gen 12 bolts have a couple widths. Axle tubes are 3.5". These came with bigger disks brakes, with the internal drum e-brake.

'92 - '97 Trooper. Either 61" or 63". If it came with factory fender flares, it's 63". Most are 63" I think.
VX - ? Not sure. Probaby same as Trooper.


And the bigger 12 bolts
'98+ Trooper. Someone else said 63" as well. This has the bigger (but fewer splines) shafts, D60 sized ring gear, etc.


And an oddball:
The '94 Amigo used the narrower 1st gen axle, but the same larger brakes/internal e-brake drum that came on the wider 2nd gen Troopers.


ABS:
Rear-wheel ABS trucks used a sensor in the 3rd member with an exciter ring pressed onto the carrier. This ring will fit the ARB carrier as well.

4-wheel ABS trucks used sensors at each wheel.


--Dan

[Independent4x]

great info Dan....i was guessing on that width...58 sounds right

i'm making a few notes here ;)

[DaveFl]

Not too familar with the late model 2nd Gens 98+ but what I understand is the axles are wider then than the previous 2nd gens 63".

This might also be only for euro Troops, Read a Aussie write up on the 98 Trooper that was talking about axle width some time ago.

I wont swear on this but it would be intresting to know.

Dave

[gringo]

I´m not sure on the widths but it is definitely a really strong axle. I have the 3rd member design with an RD44 and coils and it works great. What I can tell you though is that it is wider than the FJ40 axle. I put one up front and had to lengthen it to match the trooper axle (not to mention that I had to swap out R&P for 4.56s)

conclusion: it´s a solid solid axle and for TLCs that want to center their rear diff, its a good option (they would end up with my same setup.

Cheers,

JC

[That Mick]

What are the weight capacity's on the Zu axles??

[AirTrooper]

I just put a 89 12 bolt in my 86. it is 55" wms to wms. much wider than the 86 original 10 bolt.

[TrooperLX]

i thought the rear older 12 bolts on troopers were 53.5" measured from backing plate to backing plate?

[Grampa]

I measured my '89 12 bolt and it was 58" WMS to WMS. IIRC Cruiser front diffs are 56", so its a bit wider. Earlier 12 bolts, 88+ have an 8.66" ring gear, but they are THICK!!! Compared to my D44 front 4:56, I'd say at least 1/2" thicker than the 44, and IIRC the pinion shaft is quite a bit bigger too.