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Hum type noise while hubs are locked

3K views 0 replies 1 participant last post by  jmbosh 
#1 ·
I have a 96 f-250 that I just bought so this is my first winter using it. Its been snowing so I have left the hubs locked for getting around town but when I took it on the freeway it didn't like going much about 60 in 2wd and it had like a rough humming going on. When I'd switch it to 4wd it seemed to run smoother at around 60-65. Anyone know what would cause this? Or if its normal with these trucks?
 
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