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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)
HE - H190 revision
HF - H190A

Axle code is on Chassis Identification plate 1980-on

Starting in mid-80s, Axle Code is on door-jamb sticker.

To verify the ratio in the vehicle matches the build tag, you may count turns of the wheel vs turns of the driveshaft. 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

Factory LSD has a sticker on the back of the diff housing.