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Violent Vibration, manual hub, auto trans, 351

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Old 05-12-2004, 07:09 PM
nhenson2001 nhenson2001 is offline
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Help Please, 95 F150

I have a 95 F150. Manual Hubs. Auto Transmission. Limited slip front diff.
At aprox 60 mph or higher truck makes grinding/vibrating noise. vibrates at 50 or higher. Grinding is very violent and stressfull. Originially only made noise when in gear but coasting, or in neutral and coasting. Now does same thing when coasting or with slight to moderate acceleration. Vibration/noise is mild to non-existent when back pressure is applied via downshift.

Front Diff also sounds to be making a clank at slow speeds, like the axel banging up and down, loose in the pumpkin.

Tires are balanced
Truck drives straight

I removed the front driveline. Still makes noise/vibration
I replaced the hubs, of which the left was out. Still makes noise/vibration
Makes same noise/vibration whether in 4H or 2H
Makes same noise/vibration whether in gear or in neutral.

Results beleived to be related to symptoms
(1)Front left hub has gone out twice in four years. last replacement of left front went out within 6 months.

(2)Axel spindle seems to be off axis, tilting up (outward) aprox 3-5mm at outer most point of spindle. Front left bearing seems to be fine. Have not check bearing on pumpkin side.

(3) had to replace U joint on Front differential side of driveline.

Last edited by nhenson2001; 05-12-2004 at 08:07 PM. Reason: no reply
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Old 05-12-2004, 08:12 PM
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Chris_ce Chris_ce is offline
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pull the rear end cover off and check for damaged spider gears. On my old 94 about the same problem and that was it.
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Old 05-12-2004, 08:15 PM
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for the front end since it still happens when driveshaft is removed I would start checking the bushings starting off with the radius arms first.
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Old 05-12-2004, 08:59 PM
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MustangGT221 MustangGT221 is offline
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Any change on when the hubs are locked or unlocked?
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Old 05-12-2004, 09:04 PM
nhenson2001 nhenson2001 is offline
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No change when hubs are locked or unlocked. My gut says its in the front pumpkin
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Old 05-13-2004, 10:09 AM
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ssn randy ssn randy is offline
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when unlocked nothing should turn but the wheel and hub assembly or it shouldn't. jack it up and check, also check to see that the hub is disengaging properly (spring not broken inside the hub). also if you have the hub off, check the spindle for wear, it could be worn out allowing a lot of excess play and the bearings are vibrating. what torque spec for thightness on the bearings are you using? to high and your stuff wears out fast due to heat build up, to loose and the wheel will vibrate. the wheel hub rides on the spindle, with axle thru the middle and should be free floating with manual hub removed. if the spindle is pointed up you should be showing wear on the tire (inside/ outside) and need an alignment to adjust camber/caster (top in/bottom out or vica versa) and is easily recognized by tread wear.

something that turns is where I'd look.

Last edited by ssn randy; 05-13-2004 at 10:31 AM.
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