The following suffixes correspond to the types of parts on all Xcalliber documents: DF = Defeo New Part, A = Allison New Part, R = Refurbished Part/Transmission, U = Good Used Part, S = Surplus Allison Part/Transmission, GM = General Motors New Part, X = New Aftermarket Performance Part

Every configuration and application is unique. HP ratings and usage recommendations are suggestions based on customer feedback. These are strictly used for reference only, and will not have any impact on warranty coverage.

We only deal with Allison transmissions. We are all Allison all the time! Please understand that we are the actual manufacturer, or work directly with the manufacturer, of many of the parts we sell. Therefore, it is difficult for other retailers to compete with our product knowledge, quality, and pricing. Xcalliber performance transmission parts are proudly made in the U.S.A. We have a full staff of in-house engineers who have been producing parts that form, fit, and function in Allison transmissions since 1984. Parts are CNC machined and undergo a comprehensive inspection process. All parts are checked for dimensional accuracy, hardness, and surface finish, then laser engraved for tracking purposes.

Xcalliber is an independent manufacturer and supplier of replacement parts for Allison brand transmissions. XCALLIBER is not affiliated with, or sponsored by Allison Transmission, Inc. and is NOT an authorized Allison dealer or OEM manufacturer for Allison Transmission, Inc. XCALLIBER also offers a full line of refurbished Allison brand transmissions, performance parts and performance upgraded Allison transmissions, and is NOT in any way affiliated with, sponsored by, or otherwise endorsed by Allison Transmission, Inc. XCALLIBER has a vast product line consisting of NEW aftermarket made parts, refurbished Allison transmission parts, surplus Allison transmission parts, good used parts, and refurbished Allison transmissions. Part numbers are strictly used for identification purposes only, and in no way indicates a part is an OEM part unless specifically identified as such.