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Ashcroft P38/Wolfe Locker


Product Information

This model is to suit the P38 Range Rover and the 2002 onwards 110 rear axle.

The Locker includes a new pair of Timken journal bearings.

We can supply the Ashcroft Locker as individual units or we can build them into diff casings for you. Whatever spec you require, whether it be diff "pegging", standard 3.54 ratio or one of our HD different ratios, we can build them to your needs. If you would like a complete rebuilt diff please see here

Please note that if you opt to have your locker turned there may be a small delay in dispatch of the order

Note we can fit the locker to your diff assuming its in good condition at £ 95 + VAT.


Please note that you will need to drill and tap a hole in the diff housing for the air feed pipe to pass through. We are able to supply the drill and tap should you require.


We are able to offer a complete spare parts listing. Please see the exploded diagram below to help identify which parts you may require.


Spare parts are listed in our product codes ASH-AL01 to ASH-AL-42




Diff Pegging   This is an option for those customers who are fitting their Locker to a pegged diff.  It is not an adviseable option if the Locker is being fitted to a standard diff.   If you are pegging the diff the outside diameter must be reduced to clear the pegging pad.  If you do this op and then fit to a standard, non pegged diff, the Locker will be weaker .  For more information on pegged diffs please see here



Fitting Option


If you bring or send us your diff we are able to install the Ashcroft Locking  centre centre for £95 per diff.  

In some incidences there may be additional parts required and these will be charged in addition to the costs above.





In order to calculate your shipping costs you will need to put the items in your shopping basket and confirm your delivery address. Once you have entered these details a shipping quote will be generated. Please do not proceed to the payment stage unless you are ready to order.


User Guide

The locker can be engaged in theory at anytime that you have zero wheel speed difference, ie at a standstill or driving in a straight line but we would advise only locking below 20 mph due to handling considerations. Do not lock when you have a high difference in wheel speed ie when stuck and wheelspinning. When engaged you can expect it to lock in under 2 seconds, unlocking may take 3-5 seconds depending if the lockring is undertension due to 'wind up'. Beware of crossing side slopes with the locker engaged as this may encourage the rear to swing downhill.

Product Code: ASHLOCKERP38

Installation Information » (Click to Expand Collapse)


We have separated our installation guide into four main categories.


1) Installing your locker into the differential,


Remove the stock diff centre but be sure to mark the bearing caps so they are refitted on the correct side,

Drill are tap the diff housing, the drill size is 29/64" but 11.5mm will work OK. Then tap ¼ BSPF (19 tpi) here :



Fit the crown wheel to the new centre, install locker and set preload and backlash as per factory specs. Fit the cylinder locking tab so that the tab stops the cylinder rotating, see below.


2) Installing the Air Lines

 The solenoid is marked as shown and should be fitted as follows:-




P = Air Compressor

R = Exhaust

A = Diff (blue pipe)


Once the air compressor is mounted remove the nut and coil from the solonoid and fit to the air compressor with the 1/8” BSP M/M nipple, see photo below, it must be this way round:



Fit the 1/8” tapered 90 deg push fit elbow to the other port. Refit the coil:



Fit the brass 1/8” parallel 90 deg elbow compression fitting to the locker cylinder and fit the copper pipe to this fitting, pass the other end through the tapped hole in the diff housing. We would suggest fitting the pipe like this to allow some flex in the pipe :



Once the copper pipe is through the taped hole, fit the brass adapter nut from the outside and mark the pipe flush with the brass nut, remove nut and cut pipe, refit nut, fit the small ‘O’ ring, fit 1/8” parallel 90 deg push fit elbow. Fit air line between this push fit connector and the one on the solenoid.


3) Installing the switches and electrical connections


Rear switch

Pin 8, dash illumination, on ARB loom is blue/white (shows red bar when side light on)

Pin 7, ground, on ARB loom use black (either one)

Pin 2, feed, on ARB loom use red

Pin 3, to rear solenoid, on ARB loom use yellow


Front switch

Pin 8, dash illumination, on ARB loom is blue/white (shows red bar when side lights on)

Pin 7, ground, on ARB loom use black (either one)

Pin 2, feed, on ARB loom use yellow

Pin 3, to front solenoid, on ARB loom use green



Connecting to the solenoids

The connector on the ARB compressor loom cannot be used so please snip this off and crimp on the 2 spade connectors supplied with the locker, connect these 2 spades to the 2 parallel pins on the solenoid.


4) Final testing


Handbrake off, Centre diff unlocked, mainbox in neutral, Jack up one wheel, the wheel should spin freely,

Switch the air compressor on, allow it to run up to pressure,

Select the locker whilst spinning the wheel and it should stop dead.

Switch the locker off and the wheel should spin freely again.


Torque Settings:

Crown Wheel Bolts: 58 Nm

Bearing Caps: 90 Nm

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