4x4 not engaging
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Freshman User
Joined: Jul 2002
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4x4 not engaging
The other day I was stuck in soft sand and put the truck in 4x4. I tried to reverse and herd a loud clunk coming from the front of thr truck. The truck would not go into 4x4. I finally got out and whent home. At the house I checked everything in the front drive axel. Everything seems O.K. If I lock the hubs and put it in 4x4 everything feels locked when I try to turn the shafts by hand. Then I got my wife to make the truck spin in soft gravel. Only the rear wheel spin. The drive shaft from the transfer case to the front dif. is turning as fast as the rear one, but drive axle is not turning fast at all, and is not driving the front wheels. Could it be the pinion lock inside the dif??? If so is it hard to repair?
Thasnk you
Thasnk you
Post Fiend
Joined: Jul 2006
Posts: 6,948
Likes: 44
What are you working on?
If the hubs are locked, and the wheels are on the ground, you should not be able to turn any axles. The wheel on the ground will prevent this. You should unlock one the hubs and engage 4wd (assuming you do not have a Super Duty with ESOF), make sure you can't spin the front driveshaft by hand, and then turn the front axle opposite of the one that is engaged. Again having to assume, but it sounds like you are working on a TTB front axle, since you mentioned you could see the axles, though you may be talking about the u-joint through the knuckle.
Sounds as though you either broke a spider gear (inside the diff) or one of the axle shafts itself.
You indicated that the driveshaft turns, so it sounds as though it engages properly, and leads me to believe you have a preoblem engaging the front, or the diff has gone bad.
If the hubs are locked, and the wheels are on the ground, you should not be able to turn any axles. The wheel on the ground will prevent this. You should unlock one the hubs and engage 4wd (assuming you do not have a Super Duty with ESOF), make sure you can't spin the front driveshaft by hand, and then turn the front axle opposite of the one that is engaged. Again having to assume, but it sounds like you are working on a TTB front axle, since you mentioned you could see the axles, though you may be talking about the u-joint through the knuckle.
Sounds as though you either broke a spider gear (inside the diff) or one of the axle shafts itself.
You indicated that the driveshaft turns, so it sounds as though it engages properly, and leads me to believe you have a preoblem engaging the front, or the diff has gone bad.
