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The Ford Motor Company reference for this axle was Salisbury (no connection to the Salisbury LSD). Unlike the English axle where the whole differential assembly can be removed from the axle, the Salisbury is one unit and the rotating parts are fitted in from the rear of the axle casing.

  Salisbury Ford (Atlas) axle
  Salisbury Ford
(Atlas) axle
First made in 1970 and was fitted to Cortina 2.0 OHC and 2.3 V6, Capri 2.0 V4 and OHC, 2.8 and 3.0. The ratios fitted depending on model were 3.09, 3.22, 3.44, 3.75. Also the Ford Motor Company made 4.63 and 5.14 for competition use and reproductions of these have become available.

>Modified versions of the axle for rally use acquired the name 'Atlas' and has become the name generally applied to all versions of this axle.

The combination of design and large size make it a very durable axle, but eventually mileage can cause slack and noise to become apparent.

The axle is completely stripped and chemically cleaned and then inspected for damage, corrosion and cracks. All bearing housings are checked for size and that they are round. Assuming the axle is satisfactory, new pinion bearings are fitted to the axle, then measurements are taken using special tooling to determine the size of the pinion bearing spacer required. A spacer is then made. Measurements are also taken in the axle casing and on the crown wheel carrier to ascertain the size of the carrier bearing shims required to obtain the correct bearing preload

Then the crown wheel carrier is stripped, cleaned and checked for damage and wear, if found unsatisfactory, the parts are replaced with ones in good condition and reassembled with new thrust washers.

The drive flange is also checked for wear and damage and if found satisfactory is re-machined on both front and rear faces to ensure the surfaces are flat.

A trial assembly is done with the crown wheel and pinion together with new pinion and carrier bearings and then everything is set up to obtain a gear mesh marking. Depending on the result achieved a change of size of the pinion spacer may be required, then another spacer is made in a different size based on the meshing marking indicated. This process is repeated until the gear meshing is satisfactory. As an indication of the accuracy needed, the Ford Motor Company used a range of 60 different size spacers in increments of seven tenths of one thousand of an inch and four different size carrier bearing shims.

In the final build a specially made pinion bearing sleeve, a new seal and pinion nut are fitted and the pinion bearing rotational torque is set using special tooling. The crown wheel and carrier assembly are then fitted and the rear cover, with a new gasket, is bolted on.
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