DeFeo is the world’s premier Manufacturer & supplier of replacement parts for Allison Series Transmissions. We offer the largest selection of parts in the industry, covering all models and sizes for on and off-highway Allison Transmissions.  Our diverse range of quality parts includes Aftermarket New Parts, Refurbished Allison Parts, thoroughly inspected good used parts, and Genuine Allison New parts. Parts for Allison Transmissions like overhaul kits, filters, bushings, sensors, solenoids, ECU’s, clutches, filters, gears, carriers, shafts, oil pumps, and much more. Not only do we carry over 10,000 different line items, we also buy and sell Allison Transmissions cores. Being an aftermarket manufacturer for replacement parts for Allison Transmissions ensures that you are getting the most competitive direct from the manufacturer prices in the industry.

DeFeo was founded by Artie DeFeo in 1984. Artie worked for an Allison Dealer in the 1970’s and early 1980’s. While working at the dealership, Artie began to use his engineering background to develop new Parts that could be used for their Allison Transmission repairs at more affordable pricing. Word then started to get around and one part quickly snowballed into two, then into four, then into 8, and then in 1984, Defeo Manufacturing was born. Artie’s extensive knowledge of parts and their design, allowed Defeo to develop a myriad of parts for a variety of Allison Transmission models. These high quality engineered parts, coupled with their low prices, enabled Defeo to rapidly expand its business. Over the years, Defeo has been able to forge long lasting relationships with its customers, and strong strategic relationships with vendors. These relationships enables Defeo to expand and grow its product line as the industry evolved into more computer controlled/electronic shifting Allison Transmissions.

Today, Defeo has grown to become a global leader in replacement parts for Allison Transmissions. Through our worldwide distribution network, we currently provide replacement parts for Allison Series Transmissions in over 60 countries. Please give our knowledgeable staff a call at 1.800.682.1290 or email us at parts@defeomfg.com . We urge you to experience firsthand, our commitment to providing the highest quality, most competitively priced replacement parts in the Allison Industry.