Outer Limits 4x4 Board

was chatting to Brian (dumbdunce) at J7 regarding upgrading the diffs in the shorty

What I am after is some info on the isuzu diffs from the 4wd trucks like the RFS fire tankers, primarily are they locked? can they be locked? what is the ratio in them? has anyone put them in anything? what width are they? how hard would it be to run an airbrake system?I seem to recall they are air over hydraulic? how much could you shave off them?

I am not sure what kid of cost they would be, but they could be a suitable option over mogs understanding of course they are not portals

any info, discussion etc would be appreciated

Thanks

Tiny

Good idea, but have you checked out the size of the pumpkin? They hang low, even with truck sized tyres there's not that much clearance under them. No doubt like most truck diffs they will be very strong, probably have a 10inch crown wheel or bigger, and should take 44 inch tyres no probs....and you'll need that size to get reasonable clearance under them. Also, they are very expensive and in demand because of the high repair costs and relatively few of them about. Some years ago a local truck wrecker quoted me 5k on a second hand front Isuzu diff, which was not the later wide track model, and it needed work. They have massive swivels and axles in them too

Reddo wrote:Good idea, but have you checked out the size of the pumpkin? They hang low, even with truck sized tyres there's not that much clearance under them. No doubt like most truck diffs they will be very strong, probably have a 10inch crown wheel or bigger, and should take 44 inch tyres no probs....and you'll need that size to get reasonable clearance under them. Also, they are very expensive and in demand because of the high repair costs and relatively few of them about. Some years ago a local truck wrecker quoted me 5k on a second hand front Isuzu diff, which was not the later wide track model, and it needed work. They have massive swivels and axles in them too

yeah strength would not be an issue, from talking to brian I understand you should be able to shave a heap off them, but yeah if they are that exxy then mogs would be cheaper with the benifit of portals

Mitsubushi make a 4x4 truck. the rear diff on that is lockable comes with 5.3 diffs I think. The diff centers may even be interchangable, but you would have to check, that one

AFeral wrote:Mitsubushi make a 4x4 truck. the rear diff on that is lockable comes with 5.3 diffs I think. The diff centers may even be interchangable, but you would have to check, that one

thanks, I cont find much info on these things, but positive locking on front an rear is essential

Tiny wrote:

AFeral wrote:Mitsubushi make a 4x4 truck. the rear diff on that is lockable comes with 5.3 diffs I think. The diff centers may even be interchangable, but you would have to check, that one

thanks, I cont find much info on these things, but positive locking on front an rear is essential

They come from the Mitsu Canter. The one at Narangba RFS, when you put it into L, the locker(s) automatically go in.

There was silver canter type thing set up as a extremem campvan onn 44's. Front rear winches etc in 4wdm last month I think, deffinatly in the last 3 issues.

yep...April issue of 4WD Monthly ..pages 94 - 99...not that I have it on my desk..

The 4WD Mit Canter is SPOA with twin koni's on each corner and I think the front diff has been trussed but it hard to tell in the photos. It is running 37 x 12.5 Michelin MXL tyres..with some weird looking positive offset rims

Diff ratios are 5.714:1 with a locker in the rear...doesn't say the type of locker

It was built by a company called "All Terrain Warriors" Specialised 4WD Vehicle Builders

Open: Mon-Fri 7.00am-4.30pm 44 Central Park Drv Yandina 4561
Ph: (07) 5446 8666

www.atwarriors.com.au

Want anything else? nope good!

Isuzu 4x4 specs are here:
http://www.isuzu.com.au/assets_dynamic/ ... RK0238.pdf

Diffs are 5.125:1 banjo-type, full floating, front has birfields (CVs - wonder how big?), rear is 4-pin with LSD.

Definitely don't look too big - only downside is no lockers (unless they are an option?)

Wheels are approx 35" diameter!

hmmm wonder if they would cope with the 44s? also if there would be any way to get an ARB center in using custom axles?

Tiny wrote:hmmm wonder if they would cope with the 44s?

Should do easily. These aren't just built for 35" wheels, they're built for 35" wheels with a fully loaded truck on top of them.

KiwiBacon wrote:

Tiny wrote:hmmm wonder if they would cope with the 44s?

Should do easily. These aren't just built for 35" wheels, they're built for 35" wheels with a fully loaded truck on top of them.

they were my initial thoughts, th problem in now what cost and can they be fitted with a manual type locker....front at least, rear can be auto

KiwiBacon wrote:

Tiny wrote:hmmm wonder if they would cope with the 44s?

Should do easily. These aren't just built for 35" wheels, they're built for 35" wheels with a fully loaded truck on top of them.

Yes exactly - 35" wheels with a GVM of 6000kg and a big torquey motor - should easily be able to cope with 44's and a GVM of 2000kg or less.

have u thought of lookin at the N series 4wd diffs as the would b a mutch betta option then the F series diffs that are in the RFS. and yes the brakes in them are hydrolic over air. the other thing is all these diffs use leaf springs. They are a massively strong diffs we rarely see any of them at work that require diff work.

look at the old international truck diffs 2.5t rated (most modded trucks in the statesrun them) they are a rockwell diff from memory
and have seen them at the truck wreckers here before
<they are the ones that the pinion piots up and the shaft runs via a 90 degree gear drive very very strong diffs
that white knight rig in the states runs em from memory and they can come with standard lockers

cooter wrote:look at the old international truck diffs 2.5t rated (most modded trucks in the statesrun them) they are a rockwell diff from memory
and have seen them at the truck wreckers here before
<they are the ones that the pinion piots up and the shaft runs via a 90 degree gear drive very very strong diffs
that white knight rig in the states runs em from memory and they can come with standard lockers

Pete and phill (Tuff trucks) are running a hybrid rockwell diffs using the rockwell outer swivel and a nissan center they got rid of the rockwell center as it was too bulky. Very strong setup.

If your after good info on what works and doesnt in truck diffs give pete at OPW a call there isn't too many truck diffs he hasn't pulled appart.

cooter wrote:......strong diffs that white knight rig in the states runs em from memory and they can come with standard lockers

Cooter

If it is this White Knight you are talking about http://www.whiteknight.ca/HOME%20BASE.htm
then it has a Dana 60 front and Corporate 14 bolt in the rear.

Cheers

the SNIPER rock crawlers from years back in the states used rock well diffs very strong but tail shaft is very high, I'd look at 404"s personally

AlbyOne wrote:

cooter wrote:......strong diffs that white knight rig in the states runs em from memory and they can come with standard lockers

Cooter

If it is this White Knight you are talking about http://www.whiteknight.ca/HOME%20BASE.htm
then it has a Dana 60 front and Corporate 14 bolt in the rear.

Cheers

my mistake was a white truck i seen though