I put one on my 66 C10. It’s been 50 yrs since I last drove a 64/66 C10, so I don’t know if it helps or not. I figured it can’t hurt & might help. FYI, it wasn’t expensive & was easy to install.
1966 C-10 Short Stepside HiPo Step-by-step ~ and on-going resto build in the Project Journals
