Locker in P38

[Remy]

Hi all,

I have a RD 138 ARB locker and want to install in my 96 p38. I am getting conflicting info. Can anyone advise as to what locker fits the 96 diff and if this should fit both front and rear. From what i have read rd138 will go in the back but ARB quote 98 onwards and the RD128 will fit the front but not the rear.

Paul can you check yours. I know there are a few others with lockers who may also be able to provide advice. The cars is in the mechanics getting a few things done while i am in the states so any quick advice will be useful so i can get back to the mechanic. I was sure the rd138 would fit the rear.
Cheers,
Remy

[PaulP38a]

Want me to pull the rear diff apart, or is there a simpler way to tell?

Cheers, Paul.

[Remy]

Sorry Paul thought it was written on the diff but i cannot remember. I will search the ARB site and get back to you. Do you know if the early 95 diffs changed later in the year models. I thought they all stayed the same. Andy would probably know. Nothing like trying to solve a problem from half way around the world :)
Cheers,
Remy

[PaulP38a]

Here's what I understand... someone please correct me if I've got it wrong.

It's all to do with 2W-Traction Control versus 4W-TC:


95-98 models (TC on rear only) have a 2-pin diff at front and 4-pin diff at rear.
99+ models have 4-pin diffs front and rear, and TC front and rear.


The RD128 suits the front for 95-98 models.

The RD138 suits the rear for all P38's, and front for 99+ models.

Cheers, Paul.

[Remy]

Thanks Paul

[Scouse]

The RD128 suits the front for 95-98 models.

The RD138 suits the rear for all P38's, and front for 99+ models.


If you had a 95-98 model & wanted to fit a rear locker only, would it not be better to swap the front & rear diffs around, then update the old front (now rear) to a locker?

That way you end up with a stronger 4 pin front diff.

[RR P38]

Now that is thinking!
When you buy a locker does it come with the 4 pin centre though?
How much will this cost me to do this upgrade?

[Scouse]

When you buy a locker does it come with the 4 pin centre though?
All ARB lockers are 4 pin AFAIK.

ARB Air Lockers & Accessories | Products | ARB 4x4 Accessories (http://www.arb.com.au/products/arb-air-lockers-accessories/100design-&-Engineering.php)

[Remy]

Sounds like a great idea. When i get back from the states i will see what was done and what i have at my disposal. Thanks Scouse!

[jbell110]

Front crown wheel & pinion on a P38 are reverse cut so putting the front in the rear & rear in front you will be running on the weak side of gears..
get the right locker for the right end...


Jeff

[Remy]

Thanks Jeff

[Scouse]

Front crown wheel & pinion on a P38 are reverse cut so putting the front in the rear & rear in front you will be running on the weak side of gears..
get the right locker for the right end...


JeffI didn't realise that was the case with the P38.
It's not the case with the Discoveries so I wonder why LR went that way with the RR.

[ashtrans]

Hi,

this is getting over complicated,

all P38's take the RD138.

simple, never the RD128, yes some were 2 pin, some were 4 pin, front was reverse cut but superseeded to rear,

no swapping around required, just RD138's

Dave