Parameters A, B and H for setting up R160 R&P

[Tedman]

I'm looking for the A, B and H values for setting up an R160 diff.

The '73 510 Service Manual says the A and B values are marked on the Diff case (fig PD-24):


MIne has no marking that I can find:


Might that indicate A = B = 0?

Likewise, the H value or "Head Number" for setting the pinion height should be marked on the head of the pinion gear:


My old pinion gear head (4.38 R&P from Nissan Motorsports) shows no markings,


but it does have this stamping "6-12-17" on the shaft. FWIW, the matching ring gear has a stamping "6 12 18" on it.


Do any of these stamped numbers represent the H value, or does the absence of a stamp on the pinion gear head indicate H = 0?

[Tedman]

I think I found the answer to my questions in the '82-'83 720 P/U Service Manual for the R180 front differential, pages PD18 and PD19, where It states that if no value for H is marked on the head of the pinion gear, or A and B values are not marked on the gear carrier, the values are taken to be zero. See step 5 on PD18 and step 2 on PD19: