{"product_id":"t400-atlas-adapter-1-25-as-6401","title":"TH400 to Atlas Adapter 1.25\" - AS-6401","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe Advance Adapters TH400-Atlas Adapter (SKU AS-6401) is a 1.25\" adapter built specifically for GM TH400 transmissions with a 1.5\" output shaft stickout. That measurement is the key fitment detail — it's shorter than the AS-6400 kit's 4.5\" stickout spec, so it's worth confirming your transmission's exact output shaft stickout before choosing between the two.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eUnlike the AS-6400 (which adapts to a D300), this kit's adapter is machined for a Jeep NP231-pattern short adapter interface, so it's suited to swaps targeting that transfer case pattern.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eWhat's included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBolt, 3\/8-16 x 1-1\/2\" S.H.C.S. Zinc (723740)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eGM T400\/4L80E Gasket (716510)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAdapter, TH400 to JP NP231, Short (51-6401)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThis is a lean kit — gasket, adapter, and hardware — built for the specific TH400-to-NP231 fitment where the 1.5\" output shaft stickout matches. As with the other TH400 adapters in this line, confirming the exact stickout measurement against your transmission is worth doing before ordering, since Advance Adapters offers several lengths for different applications.\u003c\/p\u003e","brand":"Advance Adapters","offers":[{"title":"Default Title","offer_id":44666285850690,"sku":"AS-6401","price":251.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1476\/5984\/files\/0004483_t400-atlas-adapter-125_625.png?v=1785623257","url":"https:\/\/www.skinnypedalracing.com\/products\/t400-atlas-adapter-1-25-as-6401","provider":"Skinny Pedal Racing","version":"1.0","type":"link"}