Wehrli Custom Fabrication WCF100177 Allison/ZF6 Transmission Crossmember Kit for 1973-1987 GM C/K Square Body

The Wehrli Custom Fabrication WCF100177 is a heavy-duty Allison/ZF6 Transmission Crossmember Kit engineered to install an Allison automatic or ZF6 manual transmission into 1973-1987 GM 3/4-ton or 1-ton C/K Square Body truck chassis. Designed and manufactured in the USA by WCFab, this crossmember kit is the ideal companion to a Duramax engine swap, giving your classic Square Body the modern drivetrain it deserves.

Key Features:

• CAD Designed for precise fitment into the 1973-1987 GM C/K Square Body frame
• Laser Cut, CNC Bent, and Professionally Welded steel construction for maximum strength and durability
• Supports Allison automatic and ZF6 manual transmissions — ideal for Duramax engine swap builds
• High-grade mounting hardware included for a secure, reliable installation
• Epoxy primer base coat finish for corrosion resistance and long-term durability
• Bolts into factory frame locations for a clean, professional install
• Recommended for use with WCFab LB7/LLY/LBZ/LMM/LML Duramax HD Engine Swap Mount Kit (sold separately)

Built for the serious diesel swap builder, the WCF100177 crossmember is part of WCFab's comprehensive Square Body swap ecosystem. Whether you are building a performance truck, a tow rig, or a show-stopping restomod, this crossmember delivers the structural integrity and precision fitment needed to complete your drivetrain swap with confidence. Proudly Made in the USA.