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Vibration while in 4x4
Hi, I have a 99 F350 7.3 with about 310k on the motor. The transmission was rebuilt, with HD parts, about 70k ago. About a month ago, I put new ujoints and hubs in the front end.
Now the problem -- at seemingly random times I was getting a loud squeal in the front drivers side while driving at 40+ mph. Everything would seem fine, and then the squeal would start. I could feel it in the floor boards. The only way I could get it to stop, was the flip it over into 4-high and it would go away instantly. But could come back a few minutes later.
I took it to Ford and they said it was the torington bearing in the front end, so I had them replace it. Well, probably the 10th time I drove the truck after the bearing was replaced (it's not a daily driver), the noise started again, only not as loud. Instead of a high-pitch squeal, now it's a lower growl ... I cant pin down where it's coming from this time, but seems to be the same sport (front driver area).
Now I also get this growl sound when I flip into 4-high at 40+ mph. It feels almost like driving on a rumble strip.
Other than the noises, everything (trans, 4x4, etc) seems to work fine, but something is obviously wrong. Could it be the transfer case? Or maybe the front end?
Thanks for your help!