knocking front axle
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Freshman User
Joined: Jul 2008
Posts: 42
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From: Castle Rock
knocking front axle
I have a 94 f-250 supercab 5.8L auto 4X4, at 54 mph and up there is a intermitant knocking coming from the front axle (D50), I have replaced all of the u-joints because thats what the noise sounds like but hasn't seemed to help. I've run it with the front drivshaft off just to make sure it wasnt that and it's still there, Im at wits end here and am not sure what to do next. Is it the wheel bearings or maybe spindle bearing? Any help would be greatly apriciated.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Are the retainers for the calipers good, fit in the slots snug?
Caliper should be held firm, not allowed to drift up/down or rock in/out on those retainers, if they do replace them.
If not will allow caliper to rock back and forth creating a knocking sound, bumps and or with "wheel/rim hobble" at a given speed.
Example; NAPA part number UP 82471W slides only (one side).
Kit UP 82824A includes slides for both sides and with anti rattle spring for the pads.
Caliper should be held firm, not allowed to drift up/down or rock in/out on those retainers, if they do replace them.
If not will allow caliper to rock back and forth creating a knocking sound, bumps and or with "wheel/rim hobble" at a given speed.
Example; NAPA part number UP 82471W slides only (one side).
Kit UP 82824A includes slides for both sides and with anti rattle spring for the pads.
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Freshman User
Joined: Jul 2008
Posts: 42
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From: Castle Rock
I dont think its the brake caliper because it still knocks with the brakes on at speed and i'll have to check the balljoints in the morning. I just find it strange that it only knocks at 54mph +. thanks for the replys.
Cargo Master
Joined: Nov 2009
Posts: 2,364
Likes: 117
From: starship enterprise
Could be ball joints, wheel bearings, spindle bearings, tie rods, loose hub cap, spring bushings, brakes, I would start at the ball joints, then lay under the truck with good light and have someone steer back and forth on the wheel while you arelooking at the front end and look for anything moving, look at ball joints, tie rods, pitman arm, bearing hubs, u joints, spring bushings, if it looks like something is loose put your hand on it and feel for movement with wheel being jerked back and forth.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Might prove easier help narrow down the problem if helpers here could hear it too, if could post video with sound while its happening.
Has to be something unloaded or at least partially unloaded at speed.
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