Just a note for all of you driving Crown Vics.......I took mine into the shop for a L-O-F job and got some shocking news. The mechanic was checking the brakes and found a small seal leak on the passenger side wheel seal. After tearing into the axel to replace the seals....we find the center axel housing full of metal shavings. All the spider gears were broke and ready to scatter. I had no noise or any other signs of this problem. Would not be good for the rear end to lock up at high speeds. Could be bad...just thought if you all have a chance to have yours checked.