{"product_id":"wod-th400-to-atlas-transfer-case-top-mount-adapter-replaces-advance-adapters-as-6401","title":"WOD TH400 to Atlas Transfer Case Top Mount Adapter (Replaces Advance Adapters AS-6401)","description":"\u003cp\u003eThe Wide Open Design TH400 to Atlas Transfer Case Top Mount Adapter is engineered for builders who want maximum drivetrain protection, improved undercarriage clearance, and cleaner packaging in extreme off-road applications. Unlike traditional bottom-supported adapter configurations that leave the transmission vulnerable to rocks, ledges, and hard trail impacts, this design allows the drivetrain to be supported from above. This keeps critical components tucked higher into the chassis and away from the abuse that rock bouncers, Ultra4 cars, crawlers, and trail rigs experience underneath the vehicle.\u003c\/p\u003e\n\u003cp\u003eMachined in-house from 6061 aluminum, this adapter is designed specifically for TH400 4WD transmissions with 1.375\" of output shaft stickout and \u003cstrong\u003edirectly replaces Advance Adapters part number AS-6401\u003c\/strong\u003e. This is the same style of functional drivetrain packaging Wide Open Design relies on in custom off-road builds where durability and clearance matter.\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWOD TH400 to Atlas Top Mount Adapter\u003c\/li\u003e\n\u003cli\u003eHardware for Atlas transfer case mounting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesigned to replace Advance Adapters AS-6401\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eSpecifications \u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\n          \u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n        \u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for TH400 4WD transmissions\u003c\/li\u003e\n\u003cli\u003eFits 1.375\" transmission output shaft stickout\u003c\/li\u003e\n\u003cli\u003eCompatible with Advance Adapters Atlas transfer case applications\u003c\/li\u003e\n\u003cli\u003eReplaces Advance Adapters AS-6401\u003c\/li\u003e\n\u003cli\u003eMachined from 6061 aluminum\u003c\/li\u003e\n\u003cli\u003eManufactured in America\u003c\/li\u003e\n\u003cli\u003eTop-mount drivetrain support configuration\u003c\/li\u003e\n\u003cli\u003eIncreased drivetrain and underbody clearance\u003c\/li\u003e\n\u003cli\u003eImproves exhaust and skid plate routing options\u003c\/li\u003e\n\u003cli\u003eHelps protect drivetrain from bottom-side impacts\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eFitment \u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\n          \u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n        \u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cul class=\"ul1\"\u003e\n\u003cli class=\"li1\"\u003eFits GM TH400 4WD transmission applications\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eDesigned for Atlas transfer case setups using AS-6401 style adapter configurations\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eRequires 1.375\" output shaft stickout from the transmission case\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eDesigned for custom off-road chassis, Ultra4, rock crawler, and buggy applications\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eWorks well in high-clearance drivetrain and skid plate configurations\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eProvides improved exhaust, crossmember, and undercarriage clearance compared to lower-mounted adapter systems\u003c\/li\u003e\n\u003cli class=\"li1\"\u003eVerify transmission output shaft length and transfer case compatibility before installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cb id=\"docs-internal-guid-785e0e5c-7fff-2ba3-1543-a8eda468b24e\"\u003e\u003cspan\u003eTech Insight\u003c\/span\u003e\u003c\/b\u003e \u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\n          \u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n        \u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003cp\u003eTraditional TH400 to Atlas adapter configurations often place the mounting structure and drivetrain support underneath the transmission, leaving critical components exposed to rocks and trail impacts. By moving the support structure above the drivetrain, this adapter helps protect the transmission and transfer case while improving overall ground clearance.\u003c\/p\u003e\n\u003cp\u003eThe compact top-mount design also gives builders more flexibility when routing exhaust systems, designing skid plates, and packaging suspension or chassis components around the drivetrain. In aggressive off-road applications, every inch of clearance matters, and keeping the drivetrain tucked high in the chassis can significantly improve durability and breakover performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e","brand":"Wide Open Design","offers":[{"title":"Default Title","offer_id":56479919243430,"sku":"WA05050","price":375.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/WA05050-TH400-Atlas-Top-Mount-Adapter-1.jpg?v=1779132005","url":"https:\/\/wideopendesign.com\/products\/wod-th400-to-atlas-transfer-case-top-mount-adapter-replaces-advance-adapters-as-6401","provider":"Wide Open Design","version":"1.0","type":"link"}