Will check, might have mislead with the gearbox above. HJ Sandman should be standard with M20, it is HQ that got M22 as standard on 6cyl commercial if 4spd specified.

VERY rare to find a HQ 6cyl commercial with a 3.05:1 M20. Normally they are the 3.74:1 M20 (not called M22 until late in HQ). I don't think you could even option the normal M20 unless special build, I think even the HQ Sandman brochure has this screwed up.