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Add to CartSierra aftermarket engine parts are manufactured to meet or exceed OEM requirements.
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What is the Sierra 18-2104 Heavy Duty U-Joint used for?
The Sierra 18-2104 Heavy Duty U-Joint is a replacement U-joint for specified marine sterndrive applications. It fits all #1 and Alpha I units with serial numbers 1684188 through B418818, as well as TR/TRS and II SSM applications and OMC Cobra Drives from 1986 through 1989.
Which sterndrives does the Sierra 18-2104 Heavy Duty U-Joint fit?
The Sierra 18-2104 fits all #1 and Alpha I units within the listed serial number range, along with TR/TRS and II SSM applications. It also fits all OMC Cobra Drives from 1986 through 1989. Verify your drive type and serial number before purchasing.
What grease fittings are included with the Sierra 18-2104 U-Joint?
The Sierra 18-2104 Heavy Duty U-Joint includes both a straight grease fitting and a 90-degree grease fitting. The product is identified as a heavy-duty U-joint for the specified marine sterndrive applications.
What part numbers are interchangeable with the Sierra 18-2104 Heavy Duty U-Joint?
The Sierra 18-2104 is listed as interchangeable with GLM 28020, Mallory 9-72404, MerCruiser Stern Drive 36312, 41431, 58749, 75832, 758321, 75832A1, 75832A2, 75832A3, 75832T, and 75832T1, OMC Stern Drive 912214 and 915716, and Volvo Penta 853255 and 897707.
Does the Sierra 18-2104 Heavy Duty U-Joint meet OEM requirements?
Sierra states that its aftermarket engine parts are manufactured to meet or exceed OEM requirements. The 18-2104 is identified as a heavy-duty U-joint for the listed #1, Alpha I, TR/TRS, II SSM, and OMC Cobra Drive applications.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Sierra 18-2765 OMC Cobra U-Joint Bellows For Use On: All Clutch Dog Cobra Models (1986-93) DP-S, SX engines. Interchangeable with: GLM 89200 Mallory 9-72707 OMC Stern...
