Question about Ford F-150
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Posted on Jan 02, 2017
SOURCE: Chevy Tahoe 2001
Place vehicle in 4wd (high or low). This will hold the front drive shaft still for the rest of the test. Jack up the front end of the vehicle. Remove the actuator. Have a buddy spin the right front wheel while you use a long punch or screwdriver to try to manually engage the diff. The left front wheel should spin in the other direction if the diff is good. Also before you check the diff you need to grab the front driveshaft and make sure it is locked, If it spins freely when the truck is in park and in 4wd with the front end raised then problem is in transfer case. If you can't make the diff engage manually with punch then the problem is in the diff. If front diff engages manually then the problem is the actuator. Hope this helps..
Posted on Nov 27, 2008
SOURCE: Front wheels do not turn
I did run the vehicle on the lift in 4wd. The actuator is trying to engage. I removed the right side axle housing and found the shim on the end of the shaft had fallen out of place. The small roller bearing in the shaft was damaged as well. This may have happended on a previous axle seal replacement. A new shim, and bearing fixed the problem. Thanks for our reply
Posted on Nov 28, 2008
This is a common problem in older 4WD vehicles. They had locking hubs and the transfer case linked the whole drive train, front and rear wheels all together.
This was great for forward motion. It was also great for maneuvering off road. It was a problem on dry pavement if you tried to make tight turns.
When turning, the wheels on the outside of the turn have to travel farther than those on the inside. The tighter the turn is, the more pronounced the difference is.
On 2WD vehicles, the wheels spin independently. It's not an issue.
However if the drive train is locked, tremendous stress is put on it trying to turn the wheels the same amount while traveling different distances.
That j erking is one of the wheels letting go of the pavement and catching up with the other.
This 'binding' can cause radial stress fractures anywhere in the drive line. The weakest link will eventually let go.
See that giant Blazer in my avatar? It had a few weak links I could tell you about.
Anyway, AWD's are supposed to have clutches built in to prevent this from occurring.
If they aren't functioning properly, if the fluid levels are nominal, you really need to get it looked at by a pro.
I hope I've provided you some insight as to what is happening. I hope you find it to be very helpful.
Posted on Oct 11, 2009
Lift and support the front of the truck so the front wheels are off the ground.
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.
Posted on Nov 30, 2009
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