Sandman was no different to any other HJ-HZ. If L31 M41 was specified the standard axle was 3.08 (GU4), or you could option an economy axle (2.78 or 2.6) or a performance rear axle (3.36).
Economy rear axle was 2.6 in HX-HZ; 2.78:1 in HJ (except trial ADR27A HJ circa 2-3/76 which got 2.6).
The only time this differed was if L31 specified on a BO6 cab-chassis (which automatically came with M41), then the standard diff was a 3.36.
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