Question about Cars & Trucks
This is actually a fairly common and annoying problem with the auto hubs.The usual problem is the slip ring in the hub is dirty or not making contact. The fix is simply to take the hubs apart and clean the rings. This is something you can do at home in an long afternoon with tools. You need to remove the wheel, then the rotor then the wheel bearings and then the hub itself. Cleaning the rings is simple I've used steel wool to get rig of corrosion etc. This obviously isn't a step by step fix. I would suggest if you want to do this yourself then get a service manual or look for a online video. Then you will have an idea of just what it takes. The alternatives are convert to manual hubs (I did and gained 5mpg) or take it to a mechanic. This isn't a big thing but because it is buried it can cost a bit in paid labor or your time. It definitly isn;t a sell the truck kind of thing.
Posted on Feb 21, 2012
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Posted on Jan 02, 2017
What I have done in the past when manual locking hubs were difficult, is have a friend get in the vehicle and slowly roll backwards while I attempted to unlock the hub.
Posted on Feb 22, 2009
if you go to your local library you can get pictures and diagrams you are asking for and they will let you make copies to take with you as well.
Posted on Mar 02, 2009
They are operated by vacuum. Check to make sure the vacuum lines are connected and not ripped or anything. If that checks out fine, remove the vacuum line from the hub and apply vacuum to the hub, if the hubs lock then the problem is in the vacuum line or switch.
Posted on May 09, 2009
There is a possibility the axel U-joint is binding, this will put side load on the hubs and keep them from working properly. Turn the steering wheel either far right or left and with front of truck off the ground or the front end disengaged, see if the axel shafts turn free, both sides. If there is binding the U-joint(s) will have to be replaced.
Posted on Dec 17, 2009
Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.
Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.
- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.
Here is a block diagram of the IWE system
Posted on Dec 20, 2009
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