In the US and Canada the 55’s used a Borg Warner T-86 transmission with an R-10 overdrive. Each have T-86 and R-10 cast into the main case. The T-86 is a top loader side shift.
Lots of different manufacturers used this combo though. You’ll probably want to Google “T-86” and take a look at the pictures. If you can find or get the measurements of the trans to bell housing pattern, check that. Even if it’s the right Ford pattern (and I think the Yblock and the 6 were the same. Operative word “think”) there could be differences in the tailshaft length. But you’ll be able to narrow it down pretty close as to the spare. Its value to you is if that the car still has the oem transmission. Even at that, it’ll be spare parts if it’s good. More points if the governor and solenoid are still on the spare. You’d still need to determine if the solenoid is the original 6volts (assuming the car is still 6v).
If the spare is a non overdrive, it’s likely a Ford transmission not a Borg Warner. The tailshft length is different. Still useful. Or, if the spare is a non Ford bolt pattern a lot of the internals might interchange if they’re good.
If by some chance it’s a T-85 with an R-11, take it and run. Those are the heavy duty versions, Ford used them behind the hp FE engines. Heavy as hell, but stout. Real money here. Likely a lot more down under.
Ignore comments that the T-86/R-10 is weak and useless. Many of us blew them up side stepping the clutch and trying to speed shift them. Pilot error is not the fault of the machinery. They were used for years behind the 292 and 6’s and went millions of miles if driven in a sane manner.
