hey guys what in the hell could cause the bolt in the front of my rear diff to come loose? i noticed this the other day when i went to back up the car felt like it was jumping or something. i thought my carrier bearing had broken but after some inspection i found out that my diff bolts were very loose. the ones right in front of the rear diff. so i tightened the hell outta them and it seems to be ok but this is the second time it has happened. any ideas?