New EMP Replacement Hub Kits for Mercury & Mariner Outboard Propellers
Perfect for outboards within the 40–140 horsepower range, the 4-1/4″ gearcase is precision-machined and quality-tested to ensure trouble-free operation under demanding conditions. It’s the ideal solution for boaters who need a dependable lower unit replacement that integrates with existing rigging while supporting maximum performance and efficiency.
At OBParts, we supply premium gearcases, propellers, and components to keep your outboard running strong season after season. This Group D gearcase is part of our trusted selection of outboard replacement parts — built for strength, reliability, and value.
| Engine HP | Year | Prop Shaft | Gearcase | Group | Part # |
| 40/50 (4-STROKE/BIGFOOT) | ALL | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 60 (4-STROKE/BIGFOOT, 60 (SEA PRO/ MARATHON)) | 1995-NEWER | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 65 (MODEL 650, 3 & 4 CYL) | 1961-71 | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 70 | 1987-89 | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 75 (2- & 4-STROKE) | 1984-NEWER | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 75 (SEA PRO/MARATHON) | ALL | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 80 | 1978-89 | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 80 (MARINER) | 1978-83 | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 80/85 (MODEL 800, 850, 4 CYL) | 1977 & PRIOR | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 90 (MODEL 900) | 1977 & PRIOR | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 90 (2- & 4-STROKE) | 1978-NEWER | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 100 | 1988-NEWER | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 115 (MODEL 1150) | 1977 & PRIOR | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 115 (2- & 4-STROKE) | 1978-NEWER | 15 SPLINE | 4-1/4" | D | EMP-102B |
| 125 | 1994-NEWER | 15 SPLINE | 4-1/4" | D | EMP-102B |
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