taller diff gears

[chris davey]

Hey guys,
I don't own a pajero but I have a Pajero diff in my Corona drag car.

I originally had a single spinner which became a bit noisy so I replaced it. The original I was told was a 4.6 so from research it was actually a 4.625. I then bought an LSD which I was told was a 4.6 also but it seems that it is actually a 4.875:1.

I got my first full pass down the strip on the weekend and the diff ratio is just too low. Third gear in the auto is 1:1 and I am running 225/60 15's and I run out of revs at about 105mph. I need to be able to hit about 125-130mph.

I think the diff is out of a 90 model Pajero. That is what the 4wd place said but the diff guy said an 90 model.

Is there any option for me to fit a taller ratio?

I have heard that possible an L200 ute diff has a 4.22:1 ratio and that would fit in.

From this info I have just found here, it seems that I have a Nf or NG rear diff which is 9â€

[chris davey]

anyone?

[PajeroSRV]

As far as I know, there aren't any diff gears for Paj's that are higher than 4.625. You're correct in saying that the rear is a 9'in in the NG.

I'd suggest google, and a whole lot of patience......but I am sure the info is out there. Maybe try the diff out of a Starion....?

[chris davey]

I have tried google, I have tried Pajeroclub, I have tried performanceforums, I have tried 2 diff shops who REALLY weren’t helpful. I just can’t believe that they would have such a limited range of options eg. If you have a G series Toyota diff that came from hilux’s to supras you can get ratios from around 3.3 all the way up to 5.0. I am sure something must be able to fit as I really don’t want to swap diff housings.

Thanks for your reply though mate.

[Lordtrunks]

Here in the states our mitsu pickups got 4.22's 3.90's and I believe some even got 3.54.

[chris davey]

Thankyou VERY MUCH for that! I will do another google search on it. But I am hoping that the centres would swap between different 4wds and pickups in different countries. If I have the axle information and I know that it is a 9â€

[chris davey]

Is there a difference between the diffs in NF-and NG LWB and SWB models? Ie. will a SWB fit into a LWb? ANd if so, a guy reckons SWB come in 4.3:1. Is this true?

[Lordtrunks]

Here in the US ours are all geared the same lwb or swb pajero either 4.88(rare) or 4.62's

[chris davey]

Here in the states our mitsu pickups got 4.22's 3.90's and I believe some even got 3.54.

Did you just say they did come in other ratios?

[chris davey]

What about a mitsu scorpion diff? I have been told that they come in3.9:1 and a L300 centre fits into the scorpion housing. So a scorpion centre will fit into a L300 housing. Therefore, question is: is the L300 diff the same as Pajero?

[J Top]

I thought the L2oo diffs were 8" the same as the early Paj and the Scorpion
J Top

[chris davey]

Measurements taken yesterday:

Total radius of the mounting plate is 77cm.
It is a 10 bolt diff and each bolt is approx 8 cm apart.
The crown gear is 8" in diameter.
There are some numbers on the crown gear which are 339(ho in japanese)51120

The axle is 30.5mm at the spline and 33mm further down
It is a 28 spline axle.

Brakes are solid disks 330mm X10mm with big single piston calipers.

I rang a Mitsu wreckers and he said that I am stuck with that ratio and the 4.22's that the L200 utes come out with is a smaller diff and doesn't bolt in.

Except I thought the diff I had was a 9" but the crown gear is definitely 8" so does this mean an L200 diff may fit?


Here are some pics that may help?





[imag]http://pic2.picturetrail.com/VOL1006/34 ... 151448.jpg[/img]

[Bitsamissin]

Chris, the 8" ring gear is a 10 bolt and the 9" ring gear is a 12 bolt.
I have heard rumours of a 10 bolt 9" that was used around the late 80's and early 90's but have never seen one.
The rear disc brakes look like a custom job (not standard) ??
When we say a 8" or 9" we mean the the diameter of the crownwheel (on the gear side).
If you have a 9" then there is nothing in Oz vehicles that is lower than a 4.625 you will have to get a 9" 3.90/4.22 from the US.
If you have the 8" there are a few local possibilities :-
- 2wd (4 cylinder) L200/Triton = 4.22.
- Starion has a 3.54 and a 3.90 lsd in later models.
Where abouts are you located ?

Frank.

[chris davey]

The crown gear is definitely 8â€

[Bitsamissin]

Not 100% sure on that.
I would pull an axle from yours and take it to a wrecker and try it in a 2wd Triton rear diff you may get lucky and can just swap over centres rather than swapping the C&P.

[chris davey]

Yeah, already got the axle out and my spare diff ready to go and compare but no one seems to have any Sigma or L200 diff's that are already out of the car. So I suppose I will just have to pull an axle out and see.

Thanks mate.

[chris davey]

Well, just been to the wreckers.

Triton diff was way too big. Unsure what year model. It was about 90cm perimeter and was a 10 bolt also. Drum brakes.

Another pajero diff was also around the same size, 10 bolt and disc brakes.

Tried 2 2wd L300's and they were about 72cm perimeter, 10 bolt diffs.

The diff I have is 77cm perimeter diff so none of them seem to fit. I need to find more Triton ones (I think 2wd) as they should be smaller and hopefully the same size as what I have.

If anyone has a
2wd Triton
2wd L200
Sigma
Scorpion
Starion

Can you please measure the perimeter of the diff where it mounts and how many bolts it uses. This would be greatly appreciated as I can't find any of these diffs in wreckers so far.

[Miyagi]

have you any pics of the rest of the car? just interested...

[chris davey]

Here are a couple







All fine and dandy, but until I get the diff ratio sorted it is going to be a slow 13 second car for a while!

[Adomw]

Chris,

If you can't sort out another diff - why don't you run taller tyres/ wheels?

Ado

[chris davey]

That is the final option. Can't run a massive tyre though in my little Rona.

[chris davey]

Ok, I am going with the larger tyres and 4.625:1 ratio. Does anyone know if I can get a proper locker for this diff or do I have to get it welded up? Thanks

Chris

[chris davey]

Can I get my 4.625:1 locked? Just like a minispool section that will permanently lock the diff. Can you get these for Pajero diffs? Don't want an air locker as they look like way too much work.

Otherwise, if someone has a 4.625 LSD, I can swap you for my 4.875:1 LSD. That would be ideal

All help appreciated
Chris

[chris davey]

ttt

[chris davey]

no one wants some 4.875's??????????????????????

[-Scott-]

Personally, I'm now completely confused by which diff you have - but I already have 4.875, so it's not much use to me anyway.

Personally, I would have thought taller tyres would be your best bet. If you can squeeze in 10% taller tyres that would be about the same as 4.4s. Otherwise, weld it!

Scott

[Bitsamissin]

Chris you can't get an off the shelf spool.
There are Detroit lockers available (custom made down here in Melbourne).
But if you have the 8" diff there is an ARB locker for it.
The only other option is to weld it.

[chris davey]

Thank guys. Yeah the old single spinner is getting welded at the moment and I plan on using that (4.625) as well as some taller tyres.

But if anyone wants to swap a 4.625 LSD for my 4.875 LSD that would be great as I don’t have a use for it. It is the 8â€

[paulv1818]

Hi Chris,
FYI my '84 scorpion has a ratio of 3.308:1, hope this helps.
paul