Join Date: Jul 2011
Location: Lapeer , Mi
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Yeah the Vacuum Hubs are good when they work but a Pain when the trucks get older. I had a Line Crack and had to relplace it and the Lock out. The Line Cracked at the hub sometime during the Summer. Since Mine is a Crew Cab Dually I don't really need 4x4 alot even in winter. Water got down in the Hub and took out the Lockout as well.
If a Line is cracked you should be Loosing Vacuum and Not have the Hubs Locking in. You might even start to see issues with your heater vents not operating correctly because of the Loss of Vacuum(But only in 4x4 if the Crack is after the Valve). If for some reason the Vacuum Valve is stuck or broken in some way that Vacuum is applied to the Hubs and the Lines are in good working order the Hubs could be engaged. Now since your Not using 4x4 all is well but if they are locked in when you don't want them thats a different story especially on Dry asphalt. Understand I am Just grasping at Straws Here.
Get the truck warmed up to where the Probelm is Happening. Put the Truck up on Jack Stands, Nice and Solid, to get Both Front wheels off the Ground. Start the Engine and leave it in Park. Do NOT engage the 4x4. If you rotate each front wheel the you should NOT see the Front Axle U-Joints turn at the Hubs. If you do then that Hub is Locked. If both wheels turn the U-joints then it sounds Like the Vacuum to the Hubs is on and engaging the Lock outs. If only one wheel turns the U-Joint then Maybe one of the Hubs is Manually Locked in. Again just grasping at Straws.
I have heard of Issues in the Sway bar and Steering Stabilizer Shock Absorber but I haven't had any of those issues so don't know what to tell you if those could be you Issue.
I did have a Tire Crack along the Tread, Still Lots of tread on the tire, and I got a Bulge in the Tire. Didn't notice until I seen the Bulge in a Parking Lot while returning to my truck.
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Learn from other peoples Mistakes, You do not live long enough to make them all yourself.