This reproduction steering gear box is for manual steering cars and has a 16:1 ratio, it also has a 1 inch sector short shaft for the Pitman arm.
*The SMB-C was known for breaking sector shafts. There was a factory recall on the SMB-C and they were replaced by the SMB-D.
If you are trying to identify the proper steering box, the box will have a raised casting number of C7ZR-3550-A. The early (prior to approximately 5-1-1967, 01E date on the data plate) steering boxes (both manual steering and power steering) will all have used a 1 inch sector shaft, this in turn corresponds to a Pitman arm with the 1 inch hole. Later boxes all had a 1-1/8" sector shaft and corresponding pitman arms for manual and power steering.
The 16:1 ratio SMB-F box was used for production purposes on those Cougars with the Competition Handling Packages. The SMB-K box (same 16:1 ratio - Power Steering) is identical without a pitman arm. We at WCCC believe that the pitman arms were pre-installed on the steering boxes for use on the assembly line. That is why they have the SMB-F tag number. For those with manual steering and contemplating going to the faster steering box, 4-5/8 turns lock to lock to quicker 3-3/4 turns lock to lock. Understand that there will be more effort involved in turning the steering wheel.
Having issues with wobbly or loose steering? Check out our video on sloppy steering below.