rear end clicking

[mjwfarming]

i have a case ih mx 125 limited edition tractor, and when i get up to 10 mph or more there is a clicking sound coming from the rear end, when i engage front wheel assist it goes away but starts back up again at about 18 mph. has anyone else had this problem? and how did you fix it? thanks in advance!

 

[DLTTrekkers]

Tightern all wheelbolts and nuts and try again .