The Allison 1000PK transmission gains popularity as a heavy-duty transmission option, especially for those looking to upgrade their Dodge Cummins Diesel trucks. In 2006, people start considering swapping their automatic transmissions (46RH, 47RH, 47RE, 48RE, or 68RFE) or manual transmissions (GETRAG 5SP, NV4500 5SP, or NV5600) to the Allison 1000PK for increased durability and performance. CAC also begins offering conversion services for Ford Powerstroke Diesel trucks with E40D, 4R100, ZF-S547 5SP, or Z06 6SP transmissions.