A4WD Issues
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From: Wisconsin
A4WD Issues
I just got done replacing the transfer case on my Dad's 2000 Expy because it was stuck in 4Hi. After it was done, I took it on a short drive around town and everything seemed ok, it drove fine and the 4WD finally worked. The problem is as soon as I took it on the highway there was a shudder that felt like the truck was trying to shift into 4WD. I pulled the fuse for the A4WD and took it on the highway again and there was no more shudder. Any ideas? Could one of the sensors for the A4WD be messed up? Is there anyway to test them? Or could the control unit have problems?
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T-Case shift motor, or one of two wheel speed sensors located in the t-case. I'm probably preaching to the choir here, but make sure the tire sizes are the same all around, and air pressures are within a few pounds of one another.
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From: Wisconsin
Originally Posted by ToolTime
but make sure the tire sizes are the same all around, and air pressures are within a few pounds of one another.
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I had the famous "rumble" when turning from a stop. tried everything. The tires had been on the truck and not properly rotatedm even though there was lots of tread left. When I replaced the tires, the problem went away and has not come back in 20,000 km. When replacing tires on a 4x4 I have been told that it is best to replace all at once. It is all about rotation speed and I would say that if you are looking at 2 old tires with 75 % tread gone and two new tires, you are going to experience some complaints from the system.
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I'm not sure, but I would guess it is close regarding the new tires and the old ones. Did you replace your speed sensors when you rebuilt the case? Just thought of something; try airing down the newer tires a bit, like tricking the system into thinking all tires are the same, and see if things change. Keep us posted!
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I am having a similar problem. When the tires spin out in A4WD and then tries to engage 4WD, it then proceeds with a clunking sound that is trying to engage and disengage the 4WD. I just dropped the rig off at Ford and the tech said his first thought is a spring in the transfer case, but I will know more in a few hours.
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From: Wisconsin
Originally Posted by ToolTime
Did you replace your speed sensors when you rebuilt the case? Just thought of something; try airing down the newer tires a bit, like tricking the system into thinking all tires are the same, and see if things change. Keep us posted!
When the tires spin out in A4WD and then tries to engage 4WD, it then proceeds with a clunking sound that is trying to engage and disengage the 4WD.
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I got the rig back and they said that the tires were so off from not being rotated that it was creating the 4WD to engage and disengage and that new tires were the problem. I am putting on new tires today and I will let you know what I find out.
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Originally Posted by zmock8
I am having a similar problem. When the tires spin out in A4WD and then tries to engage 4WD, it then proceeds with a clunking sound that is trying to engage and disengage the 4WD. I just dropped the rig off at Ford and the tech said his first thought is a spring in the transfer case, but I will know more in a few hours.
Anyway, do any of you guys have ideas as to what could be wrong? From my experiences, it has no effect on how well the A4WD works, which is pretty solid. Can't beat doing some A4WD donuts though
Thanks again,
-rockstate
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Well, the tires took care of the problem. Now when it slips in gravel or anything and then right back on to dry pavement, it doesn't continue making the clunking sound going in and out of 4WD. It just goes in and then comes out like it should. I guess the tires were the trick!!!!!!!!
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Originally Posted by zmock8
Well, the tires took care of the problem. Now when it slips in gravel or anything and then right back on to dry pavement, it doesn't continue making the clunking sound going in and out of 4WD. It just goes in and then comes out like it should. I guess the tires were the trick!!!!!!!!
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