Question about 2005 Ford F-150

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I have a 2005 f-150 i put on new actuator and a motor on the diff.there is always a crunching noise in the front wheels the 4x4 isnt coming outwhat could it be there is vacume at the lines

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If the 4x4 will engage, but not dis-engage, then take a look for blockages in the vent tubes from the IWE ( integrated wheel ends ).

There should be a vent from each front wheel that runs up towards the engine compartment that is not plugged into anything. This is where the vac will vent to one 4x2 operation is selected.

If the vent is clear, check the IWE mechanical operation, could be an issue that the IWE is trying to release, but it is stuck in place.

Posted on Nov 17, 2009

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Posted on Jan 02, 2017

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2 Answers

My 4x4 is not engaging on my 2004 Chevy trailblazer, any ideas?


Assume for an instant that the transfer case is actually working. The next area to check is the hub actuators or that the front hubs are actually engaging to drive the wheels. Remember it requires both hubs to be locked in for the 4x4 to work or else if only one hub is locked then the front diff will work and all the drive will be to the wheel that is not locked in
The cost to check is really cheap. just jack the front off the ground and see if both wheels are engaged . Do this by placing in 4x4 and have a friend hold a wheel while you turn the other wheel or try to turn the other wheel. BY holding one wheel ,if the hubs are locked in then you will not be able to turn your wheel. Ensure that the transmission is in gear as if you are driving the vehicle.

Feb 10, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

I have a 1994 gmc k1500 4x4 wont go in four wheel change acuator on the front diff transfor case engage but axle dont


That truck did not use a vacuum actuator, it used an electric motor motor. If your transfer case is engaging and you can see the front drive line spinning, then you either have a bad actuator, switch, or the wiring is bad. I would recommend unplugging your actuator and checking for power at the wire while someone puts the truck in four wheel drive. If there is power going to it, then replace your actuator. if not, follow your wiring back and check all components. They also sell an aftermarket cable actuator for those trucks which are much more reliable.

Jan 28, 2015 | 1994 GMC Sierra

1 Answer

Hi, I have a 1996 chevy S10 Blazer 4x4 and after getting all 4 wheels off the ground have determine that when I put it in 4 wheel drive the front driveshaft (from the transfer case) does in fact turn


the front drive shaft when locked in 4 WD does drive the front diff
that inn turn drives the both front wheels if both have the same amount of traction
if one wheel is off the ground then the other will spin at twice the speed as that is what a differential is designed to do
now if you have a problem diff center ( broken teeth etc ) the there will be awful noises, clunks and bangs as the teeth from the pinion and crown wheel mismatch and hit on each other
no noises when in 4WD indicates a good diff center
the next problem will be a broken axle at the splines into the diff center spider gears ( same as one wheel off the ground or in a bog) the only wheels doing the driving are the rear wheels
next are the "u" joints or cv joints but again there will be lots of noises involved
lastly and the most frequent is the drives at the hubs
depending on the hub locks you have it will not n be locking in one or both wheels due to faulty actuator , dry damaged locking mechanism, stripped splines or not manually engaged
understand this --unless you have limited slip differentials or diff lockers on the vehicle any 2 opposing wheels or any wheels on the same side that have lost traction and regardless of being in 4WD or not you will not be going anywhere
so to fix --start at the drive hubs both sides to check actuation , engagement , then work back into the diff

Sep 03, 2017 | 1996 Chevrolet Blazer

1 Answer

4wd silverado 2500 hd


Check the oil in the transfer case. If it has lots of metal in it... time for a new one. They aren't the world's strongest.
Another check: Lift the front of the truck, while keeping the rear wheels on the ground. Engage the 4x4 switch (then turn the truck off) crawl under and try to turn the front driveshaft by hand. If it turns and the wheels turn, the transfer case is the problem if it turns but the front wheels don't... front diff issues. Any grinding, crunching etc is also a clue.

Dec 30, 2013 | Chevrolet Cars & Trucks

1 Answer

2004 ford f150 4 wheel drive doesnt work


If your truck has Vacume actuated hubs check the vacume lines running to the hubs right behind the brake rotor. If it has the electronic actuated hubs, check connectors / and or replace actuator motor on the front diff. Also possible Transfer case motor seized if you have push button 4x4

Mar 15, 2011 | 2004 Ford F150

1 Answer

When i go to put it into 4 wheel drive the light on the floor lights up but the front end doesnt engage and there is a grinding noise. any suggestions


quit possibly the 4x4 actuator is not moving all the way to full stroke, it may need a updated actuator or it may be possible that your diff. is stripped maybe from possibly running the wrong sized tires on front and rear

Jan 20, 2011 | 1990 Chevrolet K1500

2 Answers

My 4x4 doesnt work, i i hear ir grinding when i put it 4x4 low but the front wheels wont drive it will also go inti 4x4 high just that when i drive the 4x4 wont work


sounds like the transfer case is in need of rebuilding! or the front drive axels have grounded off teeth in the front diff, but I suspect the first one.

Dec 31, 2010 | 1992 Chevrolet K1500

1 Answer

Front diff not disengaging all the way


If you can verify the noise is coming from the front diff, try these two things. Back the actuator out some or completely remove it, only some fluid will leak if driven a short distance. If there is no change, use a pry bar and see how much play there is at the left front axle. Pry between something like the a-arm and the shaft of the axle or the frame and the flange of the axle. If there is excessive play, I've found the clips that hold the side bearings in adjustment sheer off and let the bearings have excessive play leading to bearing failure. The difference in the noise you hear could change because the axle goes from free wheeling to being driven. If the second description fits, all new bearings and seals should fix you up.

Dec 31, 2009 | 2003 GMC Sierra 2500HD

4 Answers

4wd switches blinking and wont engage


the 4 wheel drive switch is an extremely high failure part. i would replace it and you should be ok! hope this info helps!

Sep 22, 2009 | 1996 Chevrolet K1500

2 Answers

4x4 will not engage in 96 gmc yukon


I just fixed a friend of mines 96 yukon...shift to neutral press 4H and u can hear the actuator make noise (we even replaced it with a new one his idea and the same thing happen as old one), so as he hit the switch for 4H i layed under it (on 4 jack stands) and I could hear the motor on the transfer case make a loud noise (well thats working) and before all this I asked him did u check all your fuses (he said guarnteed to be all good) one night it was bothering me so i looked through the owner manual for the yukon and in the fuse box on driver side by the door there are (2) fuse for the 4wheel drive unit,pull one of the fuses good...pulled the other one and it was blown put in a new fuse and it works like brand new..pull fuse for anything that has to do with 4 wheel drive componants,

Dec 18, 2008 | 1996 GMC Yukon

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