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[Datsun 1200 encyclopedia]

Borg Warner Differential

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Category: Rear Axle And Rear Suspension

Revision as of 20:05, 3 May 2014
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(->Borg Warner 78)
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Revision as of 20:08, 3 May 2014
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BW60: 6.0" ring gear (152 mm -- larger than [[H145]]) BW60: 6.0" ring gear (152 mm -- larger than [[H145]])
BW68: 6.75" ring gear (171 mm -- larger than [[H165]]) BW68: 6.75" ring gear (171 mm -- larger than [[H165]])
- BW78: 7.75" ring gear (197 mm -- larger than [[H190]])+ BW78: with M78 7.75" ring gear (197: mm -- larger than [[H190]])
 + with M75 7.5" ring gear (190 mm)
BW60 (1200) vs BW68 (120Y) BW60 (1200) vs BW68 (120Y)

Revision as of 20:08, 3 May 2014

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 M68). 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 (Salisbury type)

1660.jpg Japan - welded back cover (banjo type)

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

M68 - 8-bolt cover (octagonal shaped)
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
  • 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.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 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.jpg

A unique feature is the 9-bolt rear cover.
th_R31_BW78_Gasket.jpg

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

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

640.JPG640 641.JPG641 1202.jpg1202

Series II Silhouette LSD 
2263.jpg 

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

Swaps

BW78 can be narrowed and installed in 1200.

See BW78 Rear Axle Swap

Splines

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

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.jpg

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: 6.75" 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)

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