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[Datsun 1200 encyclopedia]

Borg Warner Differential

Revision as of 11:24, 4 November 2012; view current revision
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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 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
* B210: Borg Warner Model 68 (8-bolt cover)
* R31 Australia: Borg Warner Model 78 (9-bolt cover)

Contents

Model 60

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

  • Manual serial number 54507
  • Automatic serial number 40937

This started in Late 1971.

10059.jpg 14032.jpg

Apparently this is the same diff that was in AMI-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

Model 68

Australian 120Y 4-dr Sedans from July 1976 were locally assembled and used a Borg Warner rear axle assembly. (BW model 68). All were 3.889 ratio. The 120Y Coupe, Wagon, and Panel Van, being fully imported into Australia, continued to use the Hitachi [Jap] rear-end in 3.9 ratio while the Van might have had a different [lower] ratio.

18657.jpg BW - removable back cover

1660.jpg Japan - welded back cover

BW68 - 10-bolt cover
11404.jpg 11405.jpg

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
  • and either a H150 or H145 if it doesnt

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 type of differential in the early Corollas.

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

25-spline axles
11425.jpg

Click each photo for more detail

adapted Bluebird Disc brakes
17285.jpg 18656.jpg 18657.jpg 18658.jpg

11424.jpg 11426.jpg 11472.jpg

Borg Warner 78

Australian-built R31 came with a Borg Warner 78 diff (198 mm ring gear). The ring gear (CRP) is strong, about as strong as the H190 in the Datsun pickups.

A unique feature is the 9-bolt rear cover.

640.JPG640 641.JPG641 1202.jpg1202

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

Swaps

BW78 can be narrowed and installed in 1200.

See R31 Swap Notes

Splines

R31 Skyline: 28-spline axles (strong)
R31 Pintara: 25-spline axles (weaker)

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.

Brake Upgrades

Large 300ZX rear caliper adapted
13294.jpg

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: 6.8" ring gear (173 mm -- larger than H165)
BW78: 7.8" ring gear (198 mm -- larger than H190)

BW60 (1200) vs BW68 (120Y)
11470.jpg

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

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