Question about 1999 Ford F350 Regular Cab

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Front hubs won't lock in automatically

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 jppizzo@yahoo.com

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6 Suggested Answers

  • 623 Answers

SOURCE: 2002 ford explorer 4x4 will not disengage

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

  • 1 Answer

SOURCE: 1998 ford ranger 4x4 Front Axle hubs will not engage

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

  • 3 Answers

SOURCE: warn manual hub install 2000 f-250

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

  • 79 Answers

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

dttech
  • 4803 Answers

SOURCE: not sure if the hubs are engaging?

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"

sscullys
  • 984 Answers

SOURCE: 2002 ford f150 4x4 manual transfer case vacum

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
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Posted on Dec 12, 2009

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1 Answer

Front end wont engage even though it will go from high range ito low range


Does the front drive shaft turn? Maybe the hubs aren't locking in. If the hubs don't lock, then even if the transfercase is functioning you still won't turn the front tires. Hope this helps, Shaun

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What is auto 4 wheel drive?


Auto 4 wd is when the Silverado's PCM takes readings from the front and rear driver shaft and when there is any detection that the speeds are different. The Auto 4WD will activate the transfer case to lock it self to 4wd until the front and rear drive shaft are running at the same given speed of rotation.

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I have a 1987 s-10 blazer and it will not lock in the front axle when i attempt to put it in four wheel drive thus making the four wheel drive not work.


If the locks are manual for the front axle rather than automatic, then try to twist the locking mechanism into hubs locked position.

If this doesn't work, may have to disassemble it to check that it is assembled correctly at the front wheel hubs.

Aug 13, 2010 | 1989 Chevrolet S-10 Blazer

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Front drive shaft not fully engaged in 4WD, with truck on stands all 4 wheels do rotate but if i stop front wheels the front drive shaft is not engaged


Hi,
Do you have auto locking hubs on the front wheels, or manual locking hubs?
If you have auto locking hubs chances are they are not engaging properly and will need to be removed and spline sets checked for broken teeth on locking hub and locking shaft.
If you have manual locking hubs then check that they are firm when turning to engage them in the lock position.If they are light when engaging them to the lock position then they my have broken/worn out the locking hub and spline. Also check that the engaging spring inside the hub has enough tension to engage the hubs they may be broken. If the hub are all ok then you have a problem in the transfer box, where the 4WD lever is not meshing the transfer box properly. Hope this helps, let me know how you get on.

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3 Answers

My 1984 GMC Jimmy has automatic hubs won't lock in, what do I do?


I use to sell these hubs everyday a decade ago. I had one customer buying up the cores so he could rebuild them. I asked what goes wrong with these and his reply was dirt mainly from lack of maintenance. They should be cleaned and regreased every year with new seals. Check you chevy dealer if seals are still offered

Feb 12, 2010 | GMC Jimmy Cars & Trucks

1 Answer

My friend has jus bought a 1992 Pajero, 2.5 auto, swb, no manual with it. He has heard that when changing from 4x4 to 2wd that you need to stop the vehicle, go intp 2wd, then reverse for a couple of yards...


He need not stop to change from 4x4 hi to 2wd. He can also go from 2wd to 4x4 hi "on the fly" as long as the front hubs are locked, he is going straight and maintaining a steady speed. If the hubs are manually locking, he must exit the vehicle and lock the hubs. If they are automatic locking, in order to go from 2wd to 4x4 he must stop, put the vehicle in 4wd hi and pull off. Once he starts moving, the hubs will automatically lock, he can then switch from 2wd to 4wd hi and vice versa "on the fly". To unlock the hubs, he will need to stop, put the vehicle in 2wd and back up 3 ft. (remember, this is on automatic locking hub models). Hope this is helpful!

Nov 05, 2009 | 1993 Mitsubishi Montero

2 Answers

4 wheel drive (auto locking hubs) seems to be trying to engage.


I had the same thing happen. The automatic locking hubs are faulty, causing one or both hubs to try to engage or disengage onto the front driveshaft. This makes the clicking noise and loud clunking that you hear. You may notice your steering pulling to one side of the road,because one hub is locked in. Replace the automatic hubs with new ones, do not try to fix the old ones. I liked the
convience of automatic hubs but replaced mine with manual hubs, there just way more reliable.

Jun 04, 2009 | 1994 Ford F350 Crew Cab

2 Answers

Was driving onto a paved access road to beach. put switch in 4 hi about 40 yards from sand , increased speed to about 10 mph heard a sudden bang in front of truck. Truck came out of 4 wheel. 4 wheel lights...


Your automatic locking hubs are broken. Very common on ford trucks. The front hubs are geared with hard nylon gears, and are easily broken. If you replace your front hubs with "warn (name brand)" manual locking hubs, your issue will be resolved, and you won't have that issue again on your truck.

If you replace the hubs with manual locking hubs, you will have to stop, get out of the truck, and manually lock in your hubs every time you want to engage your 4 wheel drive. It beats getting stranded somewhere with no 4x4 at all; like you have now.

If you replace your hubs with the factory automatic locking hubs, the issue will return again in time.

May 26, 2009 | 2003 Ford F150 Regular Cab

1 Answer

Jeep YJ 1991 4 wheel drive


if u got automatic front hubs stop put in park pull 4x4 shifter into 4 wheel
manual hubs at front wheels turn the hub locks to the lock position and then pull the 4 wheel shifter inti 4 wheel
also look over drivers sun visor if the tag aint worn off the direction are there... have fun 4 wheeling and keep the rubber side down
rank, rate & vote for my solution

Dec 20, 2008 | 1991 Jeep Wrangler

1 Answer

Ford auto locking hubs


you can convert auto to manual hubs warn hubs or milemarker makes good hubs. As far as lift a suspension lift is better. This really depends on what you want to do with truck. I had a 97 f250 diesel 4x4 and put front leving springs on it and new poly spring bushings and was able to clear 35" tires on factory wheels. The best exhaust upgrade is going to be a new down pipe from turbo to exhaust as far as straight pipe or muffler it depends on personal preference

Oct 17, 2008 | 1995 Ford F250

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