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class=\u0022product--variation-field--variation_field_product_description__38500 field field--name-field-product-description field--type-text-with-summary field--label-hidden field__item\u0022\u003E\u003Cp\u003EThis genuine Allison gasket seals the rear housing to the transmission case on the Allison 1000 used in 2001 - 2019 Duramax Silverado and Sierra 2500HD\/3500HD trucks. On 2WD trucks it seals the extension housing, and on 4WD trucks it seals the rear adapter housing that connects to the transfer case. GM lists it as the automatic transmission case extension housing gasket.\u003C\/p\u003E\n\u003Cp\u003EWhen this gasket hardens or is disturbed during rear housing, transfer case or transmission work, fluid can seep from the joint between the housing and the case. A new gasket reseals the joint.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EKey Features\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EGenuine Allison gasket, GM part number 29536941\u003C\/li\u003E\n\u003Cli\u003ESeals the extension housing (2WD) or rear adapter housing (4WD) to the transmission case\u003C\/li\u003E\n\u003Cli\u003EApproximately 14.4 Inch x 12.7 Inch, 0.036 Inch (0.91 mm) thick\u003C\/li\u003E\n\u003Cli\u003EFits the 5- and 6-speed Allison 1000 in 2001 - 2019 Duramax trucks\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EBenefits\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EStops fluid leaks between the rear housing and the transmission case\u003C\/li\u003E\n\u003Cli\u003ERestores a proper seal after rear housing removal\u003C\/li\u003E\n\u003Cli\u003ECorrect factory fit and material\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EFrequently Asked Questions\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EDoes this fit 2WD and 4WD trucks?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EYes. The same gasket seals the extension housing on 2WD trucks and the rear adapter housing on 4WD trucks.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWhere exactly does this gasket go?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EBetween the rear housing and the back of the Allison 1000 transmission case. It is not the transfer case to adapter gasket. That\u0027s sold separately as the Transfer Case to Transmission Adapter Gasket.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ECan I reuse the old gasket?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EWe don\u0027t recommend it. Once the rear housing has been removed, the old gasket won\u0027t reliably seal again.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWhen should I replace it?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003EAny time the extension or rear adapter housing comes off: replacing the housing, servicing the output shaft carrier bearing, or rebuilding the transmission.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWill this fit my 2020 or newer truck?\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cp\u003ENo. This gasket fits the 5- and 6-speed Allison 1000 used through 2019. 2020 and newer trucks use the Allison 10L1000 10-speed.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EFitment\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003E2001 - 2019 Chevrolet Silverado 2500HD \/ 3500HD 6.6 Liter Duramax with Allison 1000, 2WD and 4WD (LB7, LLY, LBZ, LMM, LML, L5P)\u003C\/li\u003E\n\u003Cli\u003E2001 - 2019 GMC Sierra 2500HD \/ 3500HD 6.6 Liter Duramax with Allison 1000, 2WD and 4WD (LB7, LLY, LBZ, LMM, LML, L5P)\u003C\/li\u003E\n\u003Cli\u003EIncludes 2007 Classic and 3500HD cab and chassis\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003EReplacing the rear housing? See the Allison Rear Adapter Housing for 2001 - 2010 4WD or 2011 - 2019 4WD, the Rear Adapter Housing Kit, and the Output Shaft Carrier Bearing. 2WD? See the Allison 2WD Rear Yoke Seal.\u003C\/p\u003E\n\u003Cp\u003EPrevent rear housing cracks with our Rear Housing Support for 2001 - 2007, 2007.5 - 2010 or 2011 - 2019.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWhat\u0027s Included\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003E(1) Genuine Allison extension \/ rear adapter housing gasket\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003EFor warranty information or to submit a claim, see our Warranty Form.\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EDetails:\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EEngine Manufacturer: Duramax\u003C\/li\u003E\n\u003Cli\u003ELiter: 6.6 Liter\u003C\/li\u003E\n\u003Cli\u003EEngine Designation: LB7, LLY, LBZ, LMM, LML, L5P\u003C\/li\u003E\n\u003Cli\u003EEngine Years: 2001-2019\u003C\/li\u003E\n\u003Cli\u003ETransmission Code: Allison 1000\u003C\/li\u003E\n\u003Cli\u003ELocation: Rear\u003C\/li\u003E\n\u003C\/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EApplications:\u003C\/strong\u003E\u003C\/p\u003E\n\u003Cul\u003E\n\u003Cli\u003E2001-2019 Silverado\/Sierra 2500HD\/3500HD LB7\/LLY\/LBZ\/LMM\/LML\/L5P\u003C\/li\u003E\n\u003C\/ul\u003E\u003C\/div\u003E\n      \u003C\/article\u003E\n","dialogOptions":{"width":"80%","dialogClass":"product-quick-view","buttons":[],"modal":true,"title":"Allison 1000 Rear Adapter Housing Gasket, Duramax 2001-2019 Silverado\/Sierra 2500HD\/3500HD LB7\/LLY\/LBZ\/LMM\/LML\/L5P Merchant Automotive","classes":{"ui-dialog":"product-quick-view"}}}]