24235140 vs 24266842: 6T40/6T45 case gasket Gen1–2 vs Gen3
24235140 is confirmed for bounded 6T40/6T45 Gen1–2 contexts; 24266842 is confirmed for bounded Gen3 contexts. They must not be treated as universally interchangeable.
The two gasket numbers 24235140 and 24266842 belong to different verified generation scopes. 24235140 is closed for bounded 6T40 / 6T45 Gen1–Gen2 contexts, while 24266842 is closed for bounded Gen3 contexts.
24235140: Gen1–Gen2 case / bellhousing gasket
E616 confirms 24235140 as the case/bellhousing — torque-converter-housing-to-main-case — gasket in multiple independent professional catalogs and a concrete MH7/6T45 EPC context. The hard boundary is important: do not use this evidence to sell 24235140 as a Gen3 gasket.
24266842: Gen3 case-half / intercase gasket
E618 confirms 24266842 in specific Gen3 6T40/MNK and 6T45/MHG EPC contexts. Professional transmission catalogs broaden the family terminology, but the publishable application remains tied to the specific verified Gen3 contexts.
Different generation does not automatically mean supersession
This comparison is a generation split, not a proven global replacement chain. Co-listing with other gasket-family numbers such as 24261853 or 24266166 cannot be converted into unconditional interchangeability. A Gen3 part being newer is not enough to claim that it supersedes 24235140 everywhere.
How to choose
Do not choose from vehicle name alone. Confirm transmission RPO and generation first, especially around generation boundaries. If you already know the OE, quote by OE. If you only know the vehicle, send VIN/RPO through the RFQ. Product references: 24235140 and 24266842.
Evidence boundary
This page is drafted from the current B3/fitment evidence and does not widen those source boundaries. Demand Intelligence was used only to choose the topic, not as technical evidence.