Which number was found for 6T30/MH9?

24231613 in the bounded MH9/6T30 EPC contexts of E636.

Does GM call it a case-half gasket?

No. E635 gives GM's hard identity as Torque Converter Housing Gasket; case half is the industry terminology in E637.

Does 24231613 fit every 6T30?

That is not established; Gen3/MNJ is outside the closed scope.

Is it the only possible number?

We do not claim uniqueness; missing OPTIONAL W/ is not proof that no alternative exists.

6T30 case-to-bellhousing gasket part number

In the verified MH9 / 6T30 EPC contexts, exact GM OE 24231613 is listed as the torque-converter-housing gasket. This is not a claim for every 6T30 generation: Gen3 / MNJ is not covered by this audit.

GM hard identity: Torque Converter Housing Gasket

GM Genuine Parts identifies 24231613 as an Automatic Transmission Torque Converter Housing Gasket, Classification OE. That hard identity is E635. The GM public page itself does not print 6T30/MH9, so it answers “what is this part?” rather than fitment.

Where the 6T30 / MH9 application comes from

Two independent readable EPC rows in E636 bind exact 24231613 to MH9: JU, JV, JW48-69(MH9) 2013-2018 and PJ, PL69(MH9) 2013-2016. One housing page explicitly prints (mh9) 6t30 torque converter & fluid pump housing. The code mapping MH9 → 6T30 is separately established in E625; that is a code dictionary, not permission to infer RPO from a vehicle name.

Why “case half” and “bellhousing” appear in searches

Professional 6T30 catalogs call OEM 24231613 Gasket, Case Half or Gasket - Converter Housing. That is E637 [industry] SUPPORT_ONLY: useful terminology for search and communication, but not a replacement for GM naming. Case half, bellhousing, and market equivalents should be attributed to catalog/market usage, while torque converter housing gasket remains the hard GM identity.

For the same reason, we do not pull 24235140 or 24266842 from other transmission/generation contexts into this 6T30 answer. And because the captured rows do not show an OPTIONAL W/ field, we still cannot claim 24231613 is the only possible service number at this position.

Before ordering, verify VIN/RPO using the GM 6T identification method and see how CONFIRMED is defined in the methodology page. For a specific vehicle, send VIN/RPO and market in the RFQ.

FAQ

Which number was found for 6T30/MH9?: 24231613 in the bounded MH9/6T30 EPC contexts of E636.
Does GM call it a case-half gasket?: No. E635 gives GM's hard identity as Torque Converter Housing Gasket; case half is the industry terminology in E637.
Does 24231613 fit every 6T30?: That is not established; Gen3/MNJ is outside the closed scope.
Is it the only possible number?: We do not claim uniqueness; missing OPTIONAL W/ is not proof that no alternative exists.