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[Datsun 1200 encyclopedia]

Borg Warner Differential

(Redirected from BW78)

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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)

Contents

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 10059 14032.jpgAlbum 14032

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 27108

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
19445.jpgAlbum 19445

South Africa sedan
10915.jpgAlbum 10915

3147.jpgAlbum 3147

Cast ID on bottom
13822_56514ccb9ec63.jpgPost 473891

ID tag
13822_56514cd8e24a5.jpgPost 473891

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

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

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

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 11422 11423.jpgAlbum 11423

25-spline axles
11425.jpgAlbum 11425

Click each photo for more detail

adapted Bluebird Rear Disc Brakes
17285.jpgAlbum 17285 18656.jpgAlbum 18656 18657.jpgAlbum 18657 18658.jpgAlbum 18658

11424.jpgAlbum 11424 11426.jpgAlbum 11426 11472.jpgAlbum 11472 3147.jpgAlbum 3147

Gearset removal
13050.jpgAlbum 13050 13051.jpgAlbum 13051

Bakkie

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 16298

16299.jpgAlbum 16299

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 10701

A unique feature is the 9-bolt rear cover.
R31_BW78_Gasket.jpg

Another unique feature is the 6-bolt flange:
19237.jpgAlbum 19237

Borg Warner M78 differential is also used by many other cars, but with different axle housings and brakes. Ex: 1987-1989 Chevrolet Camaro.

640.JPGAlbum 640 641.JPGAlbum 641 1202.jpgAlbum 1202

Series II Silhouette LSD 
2263.jpgAlbum 2263 

Rear Disc Brakes
7213.jpgAlbum 7213 7214.jpgAlbum 7214 7215.jpgAlbum 7215 18391.jpgAlbum 18391

Swaps

BW78 can be narrowed and installed in 1200.

Splines

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

Part Numbers

http://www.9bolt.com
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

LSD

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.

Mini-spool
13997.jpgAlbum 13997

Brake Upgrades

Large 300ZX rear caliper adapted
13294.jpgAlbum 13294

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 24059

Comparison

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 11470

BW68 (120Y) vs BW78 (R31 Australia)
11442.jpgAlbum 11442

Comparo: BW78 vs H165
12864.jpgAlbum 12864 12865.jpgAlbum 12865 12864.jpgAlbum 12864 

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This page has been accessed 97,945 times. This page was last modified 18:35, 29 June 2019. Content is available under Datsun 1200 Club.