Yes it's 4 synchro, not sure of diff ratio in that 22G846 casing.
Mini K and 1098 Clubby were both 3.647, Mk2 S was 3.444, but the pov pack vans with the puddin' stirrer gearshift I'm not sure.
If motor is off it you can paint a mark and count the teeth.
3.647 ratio has 17T pinion and 62T crown wheel.
A 3.765 one has 17T pinion and 64T crown wheel.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Pretty sure I read the 22G846 part was the original Elf/Hornet 4-sync casting. They look identical to the 1128 part, though.

All the povo pack donks/gearboxes I've come across have had the 3.647

cheers

Jacob

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'72 Clubman Van - 1022cc, 295 head, 731 cam - Daily Driver
'69 Morris 1100 S - Dinged by a bus, in shed under repair
'64 Morris 1100 - Early 1100, long term project

Thanks guys, will pull diff out when i get back from Central Coast, meeting josh from Mini Imports to pick up a set of seats.

Pulled box apart, all looks good but i think i will put a rebuild kit through it anyway. diff ratio is 3.64.