{"product_id":"sumo-23-spline-transfer-case-input-gear-rf1a-toyota-4runner-pickup","title":"Sumo Gear 23-Spline RF1A Transfer Case Input Gear | 2.28:1 (1984-95 4Runner \/ 1979-95 Pickup)","description":"\u003ch2\u003eSumo Gear 23-Spline RF1A Transfer Case Input Gear\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFor 1984–1995 Toyota 4Runner and 1979–1995 Toyota Pickup 4WD RF1A builds configured for a 23-spline input\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Sumo Gear 23-Spline RF1A Transfer Case Input Gear is a stock-ratio input gear for Toyota \u003cstrong\u003eRF1A gear-driven transfer cases\u003c\/strong\u003e. It provides a \u003cstrong\u003e23-spline input\u003c\/strong\u003e while retaining the factory-style \u003cstrong\u003e2.28:1 low-range ratio\u003c\/strong\u003e, making it suitable for factory 23-spline applications and properly configured dual-case, crawl-box, and drivetrain-conversion builds.\u003c\/p\u003e\n\u003cp\u003eChoose the standalone input gear when only the gear is needed, or select the service-bundle configuration to add the matching input bearing and RF1A overhaul gasket kit while the transfer case is apart.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e23-spline input\u003c\/strong\u003e for matching RF1A configurations\u003c\/li\u003e\n\u003cli\u003eRetains the factory-style \u003cstrong\u003e2.28:1 low-range ratio\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesigned for Toyota \u003cstrong\u003eRF1A gear-driven transfer cases\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSCM420 alloy-steel\u003c\/strong\u003e construction\u003c\/li\u003e\n\u003cli\u003eAvailable as a standalone gear or with complementary service components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e23-Spline Input \u0026amp; 2.28:1 Ratio\u003c\/h2\u003e\n\u003cp\u003eThe factory Toyota gear-driven 23-spline application is associated with the \u003cstrong\u003e1986–1987 22R-TE Turbo Pickup equipped with the R151F 5-speed manual transmission\u003c\/strong\u003e. Most naturally aspirated 20R, 22R, and 22RE RF1A applications use a 21-spline input and require the appropriate 23-spline conversion components before this gear can be used.\u003c\/p\u003e\n\u003cp\u003eThis gear retains the \u003cstrong\u003e2.28:1 stock-style low range\u003c\/strong\u003e; it is not a 4.7:1 crawl gear set.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFactory 23-Spline Application\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1986–1987 Toyota Pickup – 22R-TE Turbo – R151F 5-Speed Manual – 4WD – RF1A Gear-Driven Transfer Case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eConverted RF1A Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1984–1995 Toyota 4Runner – 4WD – RF1A gear-driven transfer-case build converted to a matching 23-spline configuration\u003c\/li\u003e\n\u003cli\u003e1979–1995 Toyota Pickup – 4WD – RF1A gear-driven transfer-case build converted to a matching 23-spline configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFitment Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eRF1A gear-driven transfer cases only.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eRequires a \u003cstrong\u003e23-spline input configuration\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eFactory V6 chain-driven transfer cases require an appropriate RF1A conversion.\u003c\/li\u003e\n\u003cli\u003eModified and dual-case vehicles must be matched to the actual transfer-case type, spline count, transmission, adapter, and coupler configuration.\u003c\/li\u003e\n\u003cli\u003eThe service-bundle configuration does \u003cstrong\u003enot\u003c\/strong\u003e include the 23-spline transfer-adapter oil seal. Inspect the existing seal and replace it separately if worn, damaged, hardened, leaking, or removed during service.\u003c\/li\u003e\n\u003cli\u003eDo not substitute the smaller 32 mm transfer-adapter seal used with other configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Sumo Gear\u003cbr\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Transfer Case Input Gear \/ Service Bundle\u003cbr\u003e\n\u003cstrong\u003eTransfer Case:\u003c\/strong\u003e Toyota RF1A Gear-Driven\u003cbr\u003e\n\u003cstrong\u003eInput Spline:\u003c\/strong\u003e 23 Spline\u003cbr\u003e\n\u003cstrong\u003eLow-Range Ratio:\u003c\/strong\u003e 2.28:1\u003cbr\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e SCM420 Alloy Steel\u003cbr\u003e\n\u003cstrong\u003eDrivetrain:\u003c\/strong\u003e 4WD\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eRelated RF1A Parts \u0026amp; Identification\u003c\/h2\u003e\n\u003cp\u003eFor transfer-case identification, spline and shifter information, see the \u003ca href=\"\/blogs\/guides\/toyota-rf1a-transfer-case-identification-guide\"\u003eRF1A Transfer Case Identification Guide\u003c\/a\u003e. Builds that also need deeper low-range gearing can use the \u003ca href=\"\/products\/sumo-gear-4-7-1-transfer-case-gear-set-rf1a-toyota-pickup-4runner\"\u003eSumo Gear 4.7:1 RF1A Transfer Case Gear Set\u003c\/a\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eAvailable Configurations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e23-Spline Input Gear\u003c\/strong\u003e — one 23-spline 2.28:1 RF1A transfer case input gear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Gear + Bearing \u0026amp; Gasket Service Bundle\u003c\/strong\u003e — includes the 23-spline 2.28:1 RF1A input gear, matching transfer input-gear radial bearing, and RF1A transfer-case overhaul gasket kit. The 23-spline transfer-adapter oil seal is not included.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sumo Gear","offers":[{"title":"23-Spline Input Gear","offer_id":67579094892853,"sku":null,"price":169.99,"currency_code":"USD","in_stock":true},{"title":"Input Gear + Bearing \u0026 Gasket Service Bundle","offer_id":67592043856181,"sku":null,"price":209.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0726\/6005\/8421\/files\/ChatGPTImageSep28_2026_02_51_19PM.png?v=1790621538","url":"https:\/\/preserverad.com\/products\/sumo-23-spline-transfer-case-input-gear-rf1a-toyota-4runner-pickup","provider":"Preserve Rad","version":"1.0","type":"link"}