{"product_id":"sierra-18-2104-heavy-duty-u-joint-cross-bearing-replaces-mercury-75832a2-fits-mercruiser-alpha-one-gen-ii-drive-shaft-housing","title":"Sierra U-Joint Cross Bearing 18-2104, Replaces 75832A2, Fits Alpha I and TR\/TRS Units","description":"\u003cp\u003eThe Sierra 18-2104 is a heavy duty U-joint cross bearing (universal joint) designed for use in the gimbal\/drive shaft coupling of outdrive units. It transmits rotational power through an angled connection while allowing the drive shaft to articulate, a wear point that requires periodic replacement as boats accumulate hours. This U-joint is built to heavy duty specification for durable service under continuous marine loads.\u003c\/p\u003e\u003cp\u003eEach unit includes both a straight grease fitting and a 90 degree grease fitting, giving installers flexibility to fit the zerk fitting in whichever orientation clears surrounding components during service, which simplifies routine lubrication once installed. The cross bearing is intended as a direct fit replacement for the OEM part it supersedes, using the same mounting geometry and bearing cup arrangement as the original equipment.\u003c\/p\u003e\u003cp\u003eThe Sierra 18-2104 fits all #1 and ALPHA I units within serial number range 1684188-B418818, and also fits TR\/TRS and II SSM drive units. Because it is designated for this specific serial number range and unit type, confirm your outdrive's serial number and unit designation before ordering to ensure correct fitment.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2104\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e U-Joint Cross Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuty Rating:\u003c\/strong\u003e Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrease Fittings Included:\u003c\/strong\u003e Straight and 90 degree\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 3.5 x 3.5 x 1.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.22 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999310293\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits all #1 and ALPHA I units, S\/N 1684188-B418818\u003c\/li\u003e\n\u003cli\u003eAlso fits TR\/TRS and II SSM units\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e75832\u003c\/li\u003e\n\u003cli\u003e75832A2\u003c\/li\u003e\n\u003cli\u003e75832T\u003c\/li\u003e\n\u003cli\u003e758321\u003c\/li\u003e\n\u003cli\u003e75832T1\u003c\/li\u003e\n\u003cli\u003e75832A1\u003c\/li\u003e\n\u003cli\u003e75832A3\u003c\/li\u003e\n\u003cli\u003e58749\u003c\/li\u003e\n\u003cli\u003e41431\u003c\/li\u003e\n\u003cli\u003e36312\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2104 U-joint replace?\u003c\/strong\u003e The Sierra 18-2104 replaces OEM numbers 75832, 75832A2, 75832T, 758321, 75832T1, 75832A1, 75832A3, 58749, 41431, and 36312.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat units does the 18-2104 U-joint fit?\u003c\/strong\u003e It fits all #1 and ALPHA I units within serial number range 1684188-B418818, and also fits TR\/TRS and II SSM units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2104 U-joint weigh?\u003c\/strong\u003e The Sierra 18-2104 U-joint cross bearing weighs 1.22 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this U-joint?\u003c\/strong\u003e The Sierra 18-2104 measures 3.5 x 3.5 x 1.25 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat grease fittings come with the 18-2104?\u003c\/strong\u003e Both a straight grease fitting and a 90 degree grease fitting are included with the Sierra 18-2104, so the installer can choose the orientation that clears surrounding components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2104 a heavy duty U-joint?\u003c\/strong\u003e Yes, the 18-2104 is built to a heavy duty specification for durable service in the drive shaft coupling of the outdrive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if this U-joint fits my outdrive?\u003c\/strong\u003e Check your outdrive's unit type and serial number; the 18-2104 fits #1 and ALPHA I units in the S\/N range 1684188-B418818, and TR\/TRS and II SSM units. Confirm your serial number falls in that range before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2104 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-2104 is manufactured and sold under the Sierra brand as a direct replacement for the listed OEM cross-reference numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-2104 manufactured?\u003c\/strong\u003e The Sierra 18-2104 U-joint cross bearing is manufactured in China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-2104?\u003c\/strong\u003e Ordering the Sierra 18-2104 includes the U-joint cross bearing along with a straight grease fitting and a 90 degree grease fitting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-2104 be used on TR\/TRS units?\u003c\/strong\u003e Yes, in addition to #1 and ALPHA I units, the Sierra 18-2104 also fits TR\/TRS and II SSM units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2104 fit Alpha One drives outside the listed serial number range?\u003c\/strong\u003e The Sierra 18-2104 is designated for ALPHA I units within S\/N range 1684188-B418818; units outside this serial range should be verified against a different part number before ordering.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988092104923,"sku":"SIE-18-2104","price":47.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2104_lg__52980.1558139701.500.750.jpg?v=1785188873","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2104-heavy-duty-u-joint-cross-bearing-replaces-mercury-75832a2-fits-mercruiser-alpha-one-gen-ii-drive-shaft-housing","provider":"Good Vibes Marina","version":"1.0","type":"link"}