Anyone using c body suspension parts

F/J/M spindles was actually the topic of conversation I had with another member. He mentioned it would be hard to tell people any differently. However, the F/J/M spindles have differences related to the upper ball joint...the ball joint mount is higher than stock, as well as offset more from the flat front surface of the spindle. This does create a couple problems, one of which some people call "bump steer" but it really is not the case.
I wont go into any further detail, but I will say that the control arms I make allow these discrepancies to be changed/adjusted/eliminated. :)