All WCFab Built Allison Transmissions are assembled in-house in our climate controlled clean room. With over 10 years of combined experience and hundreds of builds in use to date, we have been able to tweak and perfect our builds to get the most out of the Allison to withstand the power that we are able to produce with the Duramax. Description: Limitless Diesel Built Transmission uses the Highest Quality and Proven Parts in the Industry with an Unmatched Combination that has resulted in 2 Limitless Diesel Built. Transmissions - Remanufactured; Product Warranty Questions. Please contact Customer Care for any warranty questions. Engine and Transmission Warranty Claims. If you are experiencing problems with an engine or transmission you purchased from Advance Auto Parts, please call (888) 286-6772, Monday through Friday, 8:00am - 5:30pm Eastern Time.
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