Maybe someone can diagnose this problem I am having with my 8" ford. It has a slight sing to it and a very slight vibration while under load, the noise goes away under deceleration. Here is what I have done so far,, replaced the pinion bearings both inner and outer, checked the backlash on the gears (.010) the wear pattern seems to be ok. replaced both Ujoints.. The pinion angle is correct. The noise went away for about 300 miles,, but now it is back.. Looking for sugestions Thanks Guys.