Spotters Guide: How to identify Datsun 1200 rear axle assemblies.

ID

Flange

H145 36 x 50 scalloped H150 45 x 54 rectangular or round H165 same as H150, rectangular or round H190 50 x 60 BW68 48 x 60

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

Post 487206

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

Post 477495 http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/H190_510_Flange.jpg

Size

Measure the gear

Album 25277

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.

Album 21048

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

Album 24439

39 divided by 11 = 3.545 ratio

Album 25276

Pinion gear is similarly stamped

Album 25278

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

Album 11405

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)

Album 8110

B110 H145 uses hand brake Cables (no rods)

Album 9390

Coupe

http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/kbd2.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/kbd3.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/kbd1.jpg

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