Repair, Replace or Upgrade Your Allison® Transmission

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Xcalliber Profile

The founder of the company, Artie Defeo, worked for an Allison Dealer in the 1970’s, into the early 1980’s. The dealership he worked for at the time was having availability issues getting a part from the Allison factory. The part was needed to complete an Allison transmission project for a local utility company. A few weeks went by, and the part was still unavailable from the Allison Factory. Artie couldn’t wait any longer and took matters into his own hands. Using his machining background, he fabricated a replacement part he could use in place of the part that was unavailable from the Allison factory. This part functioned and performed great, and word quickly got around the industry that Artie had these replacement parts in stock. Soon, the other companies that were having the same issue getting this part from the Allison factory started to call Artie. The part Artie had developed was not only in stock, but was at a much more affordable price than what the Allison factory was offering. A light bulb went off in Artie’s head, and one part became two, two soon became four, so on, and so on. Before he knew it, a business was born.

In 1984 he took his idea of selling commonly needed replacement parts for Allison Transmissions, and started Defeo Manufacturing. Defeo focuses on providing its customers with a cost effective alternative for the most commonly failed parts used in Allison Transmissions. Defeo’s parts are made to fit, form, and function like the originals, but at a substantial discount. As the company evolved it began to offer many more parts and services for both on and off- highway Allison transmissions. Not only was the company offering new replacement parts, but began offering other affordable solutions, like refurbished parts, good used parts, or Surplus New parts. The company grew quickly and forged relationships with various suppliers and manufacturers as time went on. These relationships allowed Defeo to expand its product line to cover parts for all on and off-highway Allison Transmissions. Defeo became the leader in replacement parts for Allison Transmissions, selling parts like gasket kits, seals, bushings, bearings, solenoids, hard parts, clutches, filters, bushings, sensors, accumulators, shifters, coolers and many more throughout the industry.

In 2015 Defeo launched a whole new line of performance parts for Allison 1000 series transmissions under the name Xcalliber. As this brand grew in popularity, Defeo changed its DBA name to Xcalliber in 2020. Still owned by Defeo Manufacturing, today Xcalliber parts and transmissions can be found in over 50 countries spanning all 7 continents.

Xcalliber Mission Statement

Our mission is to provide our customers with the best quality parts & service in the industry, allowing them to obtain the most cost effective solutions to their Allison Transmission needs, while minimizing downtime.

Here are the principles of how our employees live that every day


It has always been, and will always be, about quality. We are passionate about providing parts & components that are equal to, if not better than their original counterparts. We have, and will continue to go the extra mile to do so. We try to maintain an inventory count on all commonly used items, so you don’t have to.


Our employees are passionate about what they do. They want to get your problem solved as fast as possible as we know time is money. No matter how small or large your request is, we will treat each with the same attention to detail and customer service.


We price our parts to be the most competitive in the industry. When comparing prices, if you see a price that is significantly higher from us, please ask why. Some of our products may come with added parts or components that the originals or our competitors do not include. We want and appreciate all your feedback!

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