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[Datsun 1200 encyclopedia]

Borg Warner Differential

From Datsun 1200 Club

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Category: Rear Axle And Rear Suspension

Australian-assembled B110s and B210s used a Borg Warner rear axle assembly. These use a 'Salisbury' type differential, where the gears are embedded into the axle housing. Other B110s used the Hitachi Differential, with a removable "pumpkin" gear center-section. Also some POST South Africa 1200s were fitted with a BW differential. The Borg Warner 78 is a popular swap for 1200s in Australia.

* B110: Borg Warner #Model 60 6" ring gear
* B210: Borg Warner #Model 68 (8-bolt cover) 6.75"
* R31 Australia: BW #Model 78 (9-bolt cover)


Model 60

Australian-assembled B110s used a Borg Warner Model 60 rear axle, starting in late 1971 with chassis numbers:

* Manual serial number 54507
* Automatic serial number 40937

10059.jpgAlbum click to view 14032.jpgAlbum click to view

Apparently this is the same diff that was in Australian Motor Industries-built Corolla KE10, but those have a 4 x 110 wheel bolt pattern.

Part Numbers
* 38300-H1000BW Carrier & Diff Assembly
* 38310-G0400BW Carrier
* 38315-G0400BW Bolt-carrier bearing
AXLE specs
Seal: Plaseal 18557
Axle shaft diameter: 30mm
Bearing O.D. 60mm

Wheel Bearings

Kits with bearing, collar and oil seal
Statewide Bearings kit 2742
Allied Automotive Parts kit KT2742_3
Kit 2742 contains:
* bearing 411546R (30 x 62 x 21 mm) 
* R3 (206R) collar 29.85mm id 46mm od 9mm wide
* oil seal

27108.jpgAlbum click to view

Rear wheel bearing KIT 2742
* Datsun 1200 Borg Warner axle - for most B110 Series Sedans 1970-1974
* Datsun 120Y Borg Warner axle 1974-1975
* CAPRI RWD 1972-1974 (Excluding Salisbury diff or V6)
* CORTINA Mk11 1968-1973 (Excl Salisbury Diff)
* ESCORT 1100,1300,1600, GT 1970-1976
* ESCORT TWIN CAM 1970-1971
* RS2000 MK11 1978-1982
* MkII 1976-1982 (Excluding RS 2000)
* Austin MARINA Australian Production 1972-1975
* COROLLA KE30,KE35,KE36,KE38,KE50,KE55 Borg Warner rear axle 1974-1981
* CORONA RT40,RT41 Sedan Borg Warner rear axle 1965-1970

Model 68

Australian 120Y 4-dr Sedans from July 1976 were locally assembled and used a Borg Warner rear axle assembly. (BW model M68). All were 3.889 ratio and have 23 spline axles. The 120Y Coupe, Wagon, and Panel Van, being fully imported into Australia, continued to use the Hitachi H150 (Japan) rear-end in 3.9 ratio while the Van might have had a different [lower] ratio.

120Y Sedan (vertical Shock absorbers) and iso-clamps
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South Africa sedan
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Cast ID on bottom
13822_56514ccb9ec63.jpgPost click for topic

ID tag
13822_56514cd8e24a5.jpgPost click for topic

BW: removable back cover (Salisbury type) | Japan: welded back cover (banjo type)
18657.jpgAlbum click to view 1660.jpgAlbum click to view

Width is 120Y standard: 1305 mm brake-to-brake.

M68 - 8-bolt cover (octagonal shaped)
11404.jpgAlbum click to view 11405.jpgAlbum click to view 25513.jpgAlbum click to view 25514.jpgAlbum click to view

BW can be identified as there is a rear cover (the diff [center] doesn't unbolt from the front of the axle housing - like a GM differential only smaller). There will be a metal tag on one of the bolts that holds the cover on. It tells you which type of Borg Warner, and also the ratio (makes life easy at the wreckers).

They say Borg Warner on the bottom.

  • it will be a BW if it has a removable cover at the back of the diff
  • if it doesn't have a removable cover, it is either a H150 or H145

The BW68 is the same width as a 1200 H145 diff, but have a different input flange, so you will also need the matching 120Y-BW tailshaft.

43000-H7A05-02 ???

This is the same differential in:
* Australia-assembled KE70 Corollas
* some MKII Ford Escorts
* some Cortina
* AUS Mitsubishi Sigma 6.75 diff
* Australia assembled Corona
* TX and TC Gemini (australia-assembled)
* South Africa-built Cressida
* Escort RS2000 South Africa used an M68 LSD
South Africa M68 Escort axles are called the Johannesburg axle.

Since the BW68 axle housings are a larger diameter, spring seats and U-bolts with wider spacings are used:
11422.jpgAlbum click to view 11423.jpgAlbum click to view

25-spline axles
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Click each photo for more detail

adapted Bluebird Rear Disc Brakes
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Gearset removal
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The 1400s use the M68, but with thicker sideshafts than those fitted to the 1200's M68.

173 mm (6.8") crown wheel (ring gear)
4.1 Ratio
43100-GG655 3.89 ratio
43100-HB801  035-08734  M 68  Ratio 3.89
16298.jpgAlbum click to view

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Model 78

Australian-built R31 Skyline/Pintara came with a Borg Warner 78 rear axle assembly, although fitted with M75 diff (7.5"/190 mm crown wheel/ring gear). The ring gear (CRP) is strong, about as strong as the H190 in the Datsun pickups.

10701.jpgAlbum click to view

A unique feature is the 9-bolt rear cover.

Another unique feature is the 6-bolt flange:
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Borg Warner M78 differential is also used by many other cars, but with different axle housings and brakes. Ex: 1987-1989 Chevrolet Camaro.

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Series II Silhouette LSD 
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Rear Disc Brakes
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BW78 can be narrowed and installed in 1200.


R31 Skyline: 28-spline axles (strongest)
R31 Pintara: 25-spline axles (good)

Part Numbers
Nissan Australia 38100-J7000 4.1 gearset (Pintara)
Nissan Australia 38100-J7100 3.9 gearset R32 Skyline
Nissan Australia 38100-J7110 3.7 gearset R31 Skyline M/T


R31 Skyline Silhouette had 4-pinion LSD.

BW78 LSD out of a Holden an be fitted.

There are two series BW78 carrier, LSD are different for each.

13997.jpgAlbum click to view

Brake Upgrades

Large 300ZX rear caliper adapted
13294.jpgAlbum click to view

Sigma M68 rear axle with assembly rear disc brakes

1982- Sigma GSR (GJ/GK)
1984- Sigma Super Saloon (GJ)
1984- Sigma SE (GK)
24059.jpgAlbum click to view


The BW rear ends are pretty strong - meant to be stronger than the similar-size Hitachi diffs.

BW60: 6.0" ring gear (152 mm -- larger than H145)
BW68: 6.75" ring gear (171 mm -- larger than H165)
BW78: with M78 7.75" ring gear (197: mm -- larger than H190)
            with M75 7.5" ring gear (190 mm)

M78 is offically rated for 320 lb/ft

BW60 (1200) vs BW68 (120Y)
11470.jpgAlbum click to view

BW68 (120Y) vs BW78 (R31 Australia)
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Comparo: BW78 vs H165
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This page has been accessed 92,185 times. This page was last modified 18:35, 29 June 2019. Content is available under Datsun 1200 Club.