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Don't risk expensive engine damage because of a missed shift caused by worn dog clutch rings. If your dog ring lugs have rounded to more than 25% of the lug height, or if they are no longer visibly tapered, they should be replaced. This is the narrow tooth style, designed for easier gear engagement. These dog rings work in Hewland and Webster Mk 4 through Mk 9, Staffs, Formula Mazda, and NST gearboxes to name a few.* Hewland part number HC232. Sold individually, 2 required per gearbox.
We also offer the less expensive Webster-Made Dog Clutch Ring, Part No. 1410-A47.
* Other notable gearboxes which take these "HC" type dogs include Hewland F3/F3A, 1988-2001 Dallara and 1987-91 Reynard F3, Huffaker/Richmond Spridget, Taylor Race Engineering Series 26 Spridget, and TRE Inline.
We also offer Hewland Dog Clutch Rings for LD200 Gearboxes, Part No. 1426. Although the two designs are dimensionally similar, they are not interchangeable.