I've never found anybody who can decode the Tag, not even my tame Ford dealer.

91 means the year it was first used so it's from a Mk3 Fiesta or Mk4 or 5 Escort.

You can measure the gear ratios and final drive by turning the input shaft and counting the output shaft revolutions.
Some work with a spreadsheet should let you match the ratios.

If you take some pictures of it i can tell you more about what car it came from.
It might be a B5 gearbox rather than a BC

Jim


On 20/03/2020 19:38, 'JR' via Quantum Owners Group wrote:
Anyone got info on how to decode the alloy identification tag on Ford BC cvh gearboxes? - my web searching has not found anything definitive to date - trying to find vehicle applications to determine gear ratios/final drive ratio etc.

I have a 5 spd BC with tag:-

91WT MB

F0B0 K30

John

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