For all those that dealt with the 3.9 FD, how can you calibrate the speedometer to make up for the speed change from the different rear end gearing? I know the mustangs change the little speed gear in the transmission. But how do we do it on the 350's?

Thanks,
Shaun

 

no need for it, the Z senses speed based on how much the wheels turn

 

sentry is right the z,s and g,s take the speedo reading off the rear abs sensors.