i dont know what it is but i would love some help. i have a 95 mustang gt and whenever i shift from first to second and from second to third, i hear a knocking noise from right below me. does anyone know what this could be? any help would be appriciated. it only seems to knock when im cruising. it happens right when im starting to let the clutch out

 

u-joints?

 

.... or excessive backlash in the ring and pinion.