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Spotters Guide: How to identify Datsun 1200 rear axle assemblies.
Contents |
ID
Bolt Pattern
H145 has 8-stud removable center. H150 and H165 also use 8 bolts. But only the H145 is 8-stud (the others use bolts).
H145 round 8-STUD H150 round 8-bolt H165 round 8-bolt H190 round 10-bolt BW octagonal 8-bolt
Flange
H145: scalloped flange, bolt hole rectangle 36 x 50 mm
H150: 45 x 54 mm round or rectangular flange
H165: 45 x 54 mm round or rectangular flange
There are some differences between flanges on H165's, some long (~217.5mm from carrier mounting face to driveshaft flange face), some short (~202.5mm). Depth of hole for centering boss varies also.
H190: 50 x 60 mm, round or rectangular
Size
Measure the gear
H145 measures 145mm H150 measures 150mm H165 measures 165mm H190 measures 190mm
Pre-1980
B10: H145, 3.900 VB10: H145, 4.375 (van/wagon) B20: H145, 4.375 S.T.D. / 4.625 Optional (ute/pick-up) B110: H145 3.900 VB110: H145 4.111 (van/wagon) PB110: H165 4.111 B120: H165 4.111 (ute/truck) B210 1974: H145 3.900 B210 1975-up: H150 3.700 or 3.889 PB210: H165 GB211: H165 B310: H150 various A10: H165 various
1980-up
Axle Codes H = Hitachi removable gear carrier (pumpkin/centre section) HA - H145 (145mm diameter ring gear, 5.709 inch) HB - H150 (150mm diameter ring gear, 5.906 inch) HC - H165 (165mm diameter ring gear, 6.496 inch) HD - H190 (190mm diameter ring gear, 7.480 inch) ALUMINUM CARRIER HE - H190 CAST IRON CARRIER HF - H190A revised for strength
EXAMPLE: HF38 = H190 with 3.889 ratio was factory fitted
Axle code is on Chassis Identification plate 1980-on, in the engine compartment. Starting in mid-80s, Axle Code is on door-jamb sticker.
Factory LSD has a sticker on the back of the diff housing.
Counting
To verify the ratio in the vehicle matches the original equipment (or build tag), you may count turns of the wheel vs turns of the driveshaft. If slightly less than 4 turns of the driveshaft results in one turn of the wheels, it is a 3.9 ratio. If it takes a bit more than 4 turns, it is a 4.111 ratio.
Even better is to note the stamped numbers on the ring gear. For example, this unit is stamped 39:11
39 divided by 11 = 3.545 ratio
Pinion gear is similarly stamped
BW
Australian-assembled B110 sedans used a Borg Warner Model 60 rear axle, starting in Late 1971. It has an octagonal gasket, instead of the round gasket of the Japan diffs. It is also a Salisbury type (non-banjo) so it has a bolt-on cover, while all Japan diffs have a bolt-in gear carrier.
See main article: Borg Warner Differential
H145
NOTE: Aussie-built B110 sedans with a non-removable diff center use the BW60 diff.
H145 is a Hitachi design with 145mm ring gear (5.71 inch).
B10 H145 uses a hand brake cross Rod -- a solid rod (B110 uses hand brake cables)
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B110 H145 uses hand brake Cables (no rods)
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Coupe
full
H150
See main article: H150
H150 was not fitted to Datsun 1200 orignally, but is common to have it swapped in. It looks like H145 (only 5mm larger), but has these major differences:
* H150 fastens to the axle housing with bolts instead of studs * H150 orginally was fitted to 1975-1978 B210 and 1979-1982 B310
H165
H145: Vent to left of diff H165: Vent to right of diff
H145 vs H165
Brake Line Split
1200 splitter is on right side of RHD coupe & sedan splitter is on left side of RHD ute splitter is near center of LHD coupe & sedan
Flexible Hose (from chassis to rear axle) is the same RHD/LHD. Splitter is the same.
Shock Mount
See main article: Leaf Springs
Sedan vs Coupe: sedans have a shock bracket for the axle housing, which coupes lack.
Sedan mount
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Coupe/van/truck
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Bound Bumpers
1200 Coupe/van/truck has bound bumpers
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1200 Sedan does not have this, as the bound bumper is built into the top of the shock absorbers.
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Brake Adjusters
See main article: Rear Brakes
B110, B120 to 1989, B210 has manual adjuster
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B120 from 1989 (H165) has star-wheel auto-adjuster
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B310 (H150) A14/A15 adjuster assembly (automatic with star wheel)
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