hi,im new to 4 speeds,so bare with me. i installed 4 speed in my 72 cuda using a diaphram clutch. i think my clutch adjustment rod is not set right because when back wheels are off ground and shifter is in what appears to be in neutral ,the rear tires spin ,but not as powerful if car was shifted in 1st gear does this seem to be a clutch fork adjustment or are my shifter rods not set right.thanks for the help