Ford removable axles should have no play in them.Check the lock behind the axle,make sure it is right up to the bearing.I not you will need to replace this bearing and lock it is a press fir and might have walked loose.
The noise you have is on the pull side of the ring gear.Once the wear pattern is established on the gears,its almost impossible to reverse.You said you were replace gear anywhay,should make sure you use a pion set
up tool.this will determine what side shim you will install between the pion support and the pumkin.this determines the depth of the pinion into the ring gear.This is an important step.After that,make your backlash is correct.New pinion bearings,races,crush sleeve and seal preloaded to 21 to 33 inch pounds of rolling torque.this is the right load of the pinion bearings,any thing you stand a chance pf premature bearing or race wear.that's why a lot of guys get ion trouble when the replace pion seals caude they overtighted a crusch sleeve that has already been crushed once.
The noise you have is on the pull side of the ring gear.Once the wear pattern is established on the gears,its almost impossible to reverse.You said you were replace gear anywhay,should make sure you use a pion set
up tool.this will determine what side shim you will install between the pion support and the pumkin.this determines the depth of the pinion into the ring gear.This is an important step.After that,make your backlash is correct.New pinion bearings,races,crush sleeve and seal preloaded to 21 to 33 inch pounds of rolling torque.this is the right load of the pinion bearings,any thing you stand a chance pf premature bearing or race wear.that's why a lot of guys get ion trouble when the replace pion seals caude they overtighted a crusch sleeve that has already been crushed once.