R. Cushman and Associates specializes in design and manufacturing of combination gearboxes. Our combination gearbox mates a transfer case to a right angle gearbox giving the best of both worlds. Combination gearboxes are most commonly used on mobile drilling rigs where one engine is used power the vehicle in road mode and then power the drawworks, pumps, tables, and accessories while in drill mode. All our gearing is ground to standards typically higher then AGMA standards, while the housings can be cast or fabricated aluminum or steel housings. We also have over 600 gearbox designs in our library to help fit your needs. See below our model number links for our more common combination gearboxes and specifications.
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