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Manufacturer functional interchange
Superior Gearbox B040 appears in the same manufacturer-published cross-reference row as Hub City 131L at Match installed ratio/application · VarioDrive size 040.
Superior Gearbox publishes B040 (VarioDrive size 040, input shaft) as a competitor cross-reference target. Superior describes VarioDrive as functionally interchangeable with listed drives while requiring independent verification of ratings, dimensions, fit and application suitability.
The manufacturer describes the target family as functionally interchangeable with the listed competitor model or configuration.
Hub City 131L and Superior Gearbox B040 are tied by the published source at Match installed ratio/application · VarioDrive size 040.
The source still requires ratings, dimensions, ratio, fit, and application conditions to be checked before ordering.