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When the control module comes off the main case, the Allison Transmission Seal and Gasket Kit is what lets it go back on without a leak. The Allison Transmission 29559774 is a 4000-series service kit, pairing the gaskets that face the case with the rubber seals that close each fluid passage. Those seals hold in the fluid that pressurizes the clutches, so a fresh set matters whenever that seam has been opened. Grouping them in one kit means the whole interface is resealed together instead of one part at a time.
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