Salisbury Differential

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Original submission by T Apr 10th 2007:

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Salisbury Rear Axle from HK-T-G Holden. Note a Salisbury Rear Axle has a Cover on the rear side and the Diff centre is not removeable. Click to Enlargen. Photo by Jayson Condon.
Banjo Rear Axle. Note there is no rear Cover. Photo by Ben Campbell. Click to Enlargen.
 
Salisbury Diff with the Rear Cover and the Carrier removed. Note that the Pinion Gear can remain in the Axle housing. You can see the Diff Breather on the upper right hand side of the Axle Housing. Photo by Irenk Wahyudi. Click to Enlargen.
 
A Salisbury 10 bolt Rear Axle. The early type from a HK T G. Note the rear tinplate cover. The 10 Bolts holding the Cover is not relevant to the Diff name. Click to enlarge. Photo by Afreakin Sam.
 
10 bolt salisbury 2.78 diff to suit hq -wb ute pvan tonner. Click to Enlargen. Photo by Pedroshq.

Salisbury Differential:

Origin of the Name:

So often car parts are named after a region in Detroit where so many car patents were established. A Salisbury diff has a removeable tinplate cover on the rear of the axle housing. 

LSD:

Limited Slip Differentials have been made in either Banjo or Salisbury form. LSD
HZ Salisbury Rear Axle. With the Tinplate cover removed it can be seen that the Carrier Bearings bolt directly to the Axle Housing. Click to enlarge. Photo by Dusty Dirt Roads.

Why Salisbury?

A Salisbury Rear Axle solves the problem of the rotating centre that Banjos have by placing the carrier bearings in the axle housing rather than in the removable centre.

10 Bolt:

Submitted by Qute on Tue, 10/04/2007 - 11:52. A Salisbury diff is called a 10 bolt because it has 10 bolts holding the crownwheel. The fact there are 10 bolts holding the cover on is just a coincidence. End of Qute's submission. Further details here Thread

Ratios:

if the car is original and you can guarantee it has the original diff you could go off the body ID plate under the bonnet.
However if someones replaced the diff at some stage it may have a different ratio.Look for the plate under the bonnet on the cowl with ENG TRANS RRAXLE down the bottom. compare the code next to RRAXLE to these:
GU4 = 3.08:1
GU7 = 2.78:1
GU8 = 3.90:1
GV2 = 3.36:1 (V8 HQ's Only)
GV4 = 3.36:1
GV7 = 3.55:1
G70 = 2.60:1
GM9 = 4.44:1 
VK V8 Commodore Salisbury Rear Axle. Click to enlarge. Photo by Benzit116.
   

Diff Gears:

The diff gears are accessed by a tin plate cover on the rear of the axle housing. The image shows an axle in the background that is a Salisbury. It does not have a removable centre with studs and nuts that look like the skin tuning keys on a Banjo. See also Salisbury Cover Removed Thread See also Banjo_Differential. See also 9 Inch Banjo Thread.GTS688's Shed

Rear Axles:

 Note that there are coarse and fine spline axles.

Coarse Spline Axles:

 The coarse spline axles have the fewest teeth and are the early type. These were prone to breaking.

Fine Spline Axles:

The fine spline axles have the most teeth and are the later type. These solved the axle breaking problem.

Diff Change:

Note that when changing the differential the axle type must be observed. Changing the side gears inside the differential is a quick job for a diff ace and can make it easy to match axle type to the side gears.Rear Axles 
Salisbury Rear Axles. Click to enlarge. Photo by GTS688.
 
Salisbury Rear Axles. Click to enlarge. Photo by GTS688.
 
LH Sals yoke. RH banjo 6cyl yoke. Click to enlarge. Photo by HQ SS.
 
Foreground is a 9 Inch Banjo Differential and Rear Axle. See the 9 Inch Thread, background is Salisbury. Click to enlarge. Photo by HQDreamer.
 
 
2.6 Ratio VK V8 Salisbury Diff. Click to Enlargen. Photo by HZ Tonner 308.
 
Salisbury Diff. Note the damaged teeth on the side gear. Click to Enlargen. Photo by Sarsha.
 
The Pinion Nut in a Differential is not tightened to any torque setting. It has been tightened to set a specific Pre-Load (drag) in the Pinion Bearings. Before undoing the Nut, it must be marked so that it can be re-tightened to exactly the same position to preserve the Pre-Load. Photo by March17th . Click to Enlargen.
 
Axle Tube separating from the Diff Housing from a Salisbury Rear Axle on a 253 Powered HX. Photo by SpudWB. Click to Enlargen.
 
Axle Tube separating from the Diff Housing on a Salisbury Rear Axle on a 253 Powered HX. Photo by SpudWB. Click to Enlargen.
 
VK Commodore Borg Warner Axle Filler Plug. It's a Rubber Bung rather than a Hexagonal Bolt or a 3/8" Drive Plug like some other Axles use. GM Part Number VS16561. Photo by T. Click to Enlargen.
  
  

A UC Salisbury Rear Axle and Diff is the Ideal Replacement for an EH:

The UC Salisbury Diff has fine splined Rear Axles and the perfect width for fitting to an EH that has increased Rear Axle torque needs. 

Links:

HX 253 Axle Separation Thread

Terms:

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