Question about 1999 Ford F350 Regular Cab
My front hubs won't lock in from the auto-lock position. They will though if I put them in lock position. I have replaced the hub lock solenoid, the vacumn pump, the o- rings in the hubs, and the vacumn lines from the bulkhead fitting to the hubs. The 3 wire plug to the hub lock solenoid only has power to center terminal, but wether it is in 4x4 or not!!!!! The transfer case is engaging and the hubs lock if I lock them in manually. Thank you, John email@example.com
Not knowing what type of 4wd engagement sytem you have, this is a guess. Maybe vacuum operated, look for a cracked or disconnected hose.
Or do you have manual locking hubs, that have to be turned manually?
Posted on Nov 04, 2008
I found a website that explaned that you can remove the hub and dust cover, inside is a spring which holds the hub out, removing this spring and replacing the rubber dust cover and hub will lock your front hubs in continious. as is done on later models, This has worked for my 98 4wd
Posted on Dec 18, 2008
When you turn the knob to 4x4 the transfer case will engage then it will also activate the vacuum for the hubs. the truck will kick to a lower gear with transfer case engaged but the hubs are not. thats where the manual hubs come in you will have to lock them in order to spin the wheel.
Posted on Dec 29, 2008
SOURCE: Ford F150 4x4 Passenger side hub
is the sound like a gear jumping noise?if so check the hub assembly and the spline inside the front differential........more than likely the hub assembly
Posted on Mar 22, 2009
Well, the best way is to place the vehicle on a hoist and raise all 4 wheels off the ground and put it in 4WD and see if all the wheels start turning.
Another way is to make a really sharp (slow) turn while the unit is in 4 wheel high or 4 wheel low on dry pavement. You should be able to feel the driveline wrap-up caused by the front wheels trying to grab during the hard turn.
4 Low should be easily distinguishable from 4 High as well as 2 Whl when you accelerate and it feels like the transmision is stuck in low gear and the engine starts screaming for mercy at high RPM and you are only doing 30 MPH.
Posted on Oct 18, 2009
Testimonial: "thanx i was able to get in in 4low,it just takes a few seconds as it goes from 4h then to 4l. I f I had the manual it probably would have told me that"
The vacuum shift solenoids have power to one side of them at all times.
The GEM applies ground to them, to activate them, after the shift on the fly position confirm from the trans case.
The power to both should be on the White w/ Light Blue stripe wire.
Ground to them ( from the GEM ) is
2WD : Gray w/ Black stripe wire
4WD : Red.
The only TSB I know of is for the 04-06 MY trucks, for the IWE solenoids ( the kind without the water shield ).
Did you jack up the front end ( and support correctly ) turn the key to the run position ( do not start ), and shift into 4WD, and check the front drive shaft ?
If the shaft still turns, the problem is in the transfer case, if not you are looking in the correct place.
The GEM will not signal a vacuum solenoid until the transfer case has shifted into 4L or 4H ( 4 switches that are the return signal to the GEM ). Could be a problem with the connector on the transfer case ( think it is a 8 or 10 pin connector ) to the contact plate position switches in the trans case.
There is a manual front ale cable, but I would think you would want to confirm why the GEM is not signalling the shift solenoids, prior to replacing them
Posilock make a kit for the F-150
Posted on Dec 12, 2009
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