Hello,Im new to the board, and am looking to purchase a 97 LX 450 with about 98k on the odometer. I noticed for my second test drive that there was a Whining noise from just a few MPH to about 45 then you would not hear it after that. The whine starts of slow then gets faster with speed. Does not matter if your accelerating or rolling down hill. Owner suggest that it maybe a bad tire that was replaced due to a recent blow out. I don’t buy this excuse. Has had 4 new rotors put on. With 3 newer tires. Also How do you tell if this has Locking diffs? I do plan on wheeling this vehicle. Any help to possible causes or known issues would help. Thanks In advance