The replacement or purchase cost of an Allison transmission varies dramatically based on whether you are buying a light-duty aftermarket unit, a heavy-duty commercial transmission, or a custom performance-built assembly. Standard remanufactured units for consumer heavy-duty pickup trucks typically range from $4,000 to $7,000 excluding labor, while specialized heavy-duty vocational, transit, or custom race-ready units equipped with upgraded torque converters and billet shafts can easily cost anywhere from $8,000 to over $15,000 depending on the exact series and application specifications.