Page 101 - JGS4x4 CATALOGUE

> Off-Road

Ashcroft Transmissions

DA1224 Diff Locker
> A unique non-rotating annular piston locking actuator is
designed to eliminate air leaks sometimes found with
rotating seals.
> The annular piston is also designed to eliminate the oil
blow back in the air exhaust line.
> The large piston area gives maximum hold-in force to
reduce the possibility of jumping out of lock.
> Locking ring gives full 6mm positive engagement with Heavy-duty Crown Wheel & Pinions
side gear, again reducing the possibility of jumping out With the standard diff design, under extreme conditions,
of lock. the front diff tries to climb out of full engagement under
> Gears have been redesigned for maximum strength full power and then easily strips the teeth. Ashcroft has
and durability. cut the gears in reverse for the front so they try to push
> The lock ring is made from high spec 300m steel to together in mesh rather than push out so much stronger
provide ultimate strength and ability to withstand shock then the original design. Ashcroft looked at the materials
loads. used and compared these to the genuine materials
> Locking actuator cage made from steel to withstand used by Land Rover. The range are made from improved
shock loading caused by power locking. materials which is an improvement over the genuine
> Locker body turned from billet 817M40T (EN24T) to give specification. All pinions accept the later 24 spline drive
optimum strength.
DA9011 flanges and have the female thread to accept the later
> Only change necessary to fit the locker is drill and tap type bolt (FS112301P) and washer (FTC5413), all ring gear
the diff housing ¼” bsp for the air feed fitting. threads are the stock 3/8 UNF, we stock the late flanges
> No changes to the axle case. head high tensile bolts for these also FTC5150, see
> Requires on board air supply - not supplied. related parts. Ashcroft have chosen to coat the crown
DA1224 wheel and pinions in chemical black to aid corrosion
Defender 90 - 1993 onwards Front & Rear resistance and offer a unique appearance.
Defender 110 - 1993 onwards Front DA1207
Discovery 1 - 1993 - 1998 Front & Rear Front with reverse cut
Discovery 2 Front & Rear Heavy-duty 4.12 ratio using a tooth count of 33 on the
Range Rover Classic - 1993 - 1996 Front & Rear crown wheel and 8 teeth on the pinion.
DA1224SN NEW Defender/Discovery 1/Range Rover Classic
Defender 110 - 2002 onwards (Wolf) Rear DA1508
Range Rover P38 Front & Rear Rear long pinion
Heavy-duty 4.12 ratio using a tooth count of 33 on the
crown wheel and 8 teeth on the pinion.
Defender - up to 7A/Discovery 1/Range Rover Classic
DA1225 Automatic Torque Biasing Limited Slip Differential DA1208
DA9011 Rear short pinion
Defender - 1993 onwards Front & Rear Heavy-duty 4.10 ratio using a tooth count of 41 on the
Discovery 1 - 1993 - 1998 Front & Rear crown wheel and 10 teeth on the pinion.
Discovery 2 Front & Rear Defender - 7A onwards/Range Rover P38
Range Rover Classic - 1993 - 1996 Front & Rear DA1207
> Fully automatic - needs no driver input
> Totally transparent on road, i.e., no unwanted adverse
effects
> Only comes into play when one wheel looses traction,
i.e., a difference in wheel speed
DA1225 > Enhances the traction control as it multiplies the bias
Cross Pin load created by the braking effect of the traction control
The standard LT230 transfer boxes have a two piece > Needs no special oils
cross pin in the centre diff, this is two shafts with a cut > Needs no adjustment as the gears compensate for any
out in the centre so they can overlap. This one piece wear that takes place
heavy-duty cross pin is much stronger. > Only with 24 spline side gears

Photo courtesy of Adrian Payne
www.britpart.com 105