Diff ID

Revision as of 07:41, 23 September 2015; view current revision
<-Older revision | Newer revision->

Spotters Guide: How to identify Datsun rear axle assemblies.

ID

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
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

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.

See main article: Borg Warner Differential

album

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).

Sedan vs Coupe: sedans have a shock bracket welded to the axle housing, which coupe housings lack:

B10 H145 uses a hand brake cross Rod -- a solid rod (B110 uses hand brake cables)
album

B110 H145 uses hand brake Cables (no rods)
album

Coupe
full

full

H165

H145: Vent to left of diff
H165: Vent to right of diff

H145 vs H165

album

album

album

album

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 mount
album