Template:Diff ID

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Size

Measure the gear. This H150 unit measures 150mm

H145 measures 145mm
H165 measures 165mm

Pre-1980

B10: H145, 3.900 
 VB10: 4.375 (van/wagon)
 B20: 4.875 (ute/truck)
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/GB210: 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)
HA38 H150 3.889 ratio
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

Axle code is on Chassis Identification plate 1980-on

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