Another Hub diagnosis needed!!!!
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Joined: Mar 2005
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Another Hub diagnosis needed!!!!
Symptoms -
1. auto-hubs do not lock all the way in. To clarify, I can feel the hubs lock, but once I give it some gas/torque, the front slips out of 4x4.
2. Manual hubs will lock in.
3. Sudden noticable "whine" from front end. Sounds like mudders at 55, but I don't have tires like that. It is definitely based on rotation of the front end. When I hit 35mph the whine shows up, past 45 or so, the whine disappears. Only to return when I slow to stop and the car is passing back through that range.
4. When I turn the key in the ignition without starting the engine and then move the in-cab selector from 2 wheel to 4 wheel, I hear the actuator pump going to town. Most posts here on the forum say the pump should only be working for about 30 seconds to actuate into 4x4. Mine now seems to pump forever. So I was thinking leak, but I took it to a place today to look at it and they said nothing seemed wrong but they felt like they were really unfamiliar with the 4x4 system.
I was stuck recently (in a 4 foot snowdrift) and really gave the 4X4 a workout right before experiencing this problem. Other than that the ball joints were replaced earlier that day, but I am told the hub assembly was not taken apart to replace the joints.
1. auto-hubs do not lock all the way in. To clarify, I can feel the hubs lock, but once I give it some gas/torque, the front slips out of 4x4.
2. Manual hubs will lock in.
3. Sudden noticable "whine" from front end. Sounds like mudders at 55, but I don't have tires like that. It is definitely based on rotation of the front end. When I hit 35mph the whine shows up, past 45 or so, the whine disappears. Only to return when I slow to stop and the car is passing back through that range.
4. When I turn the key in the ignition without starting the engine and then move the in-cab selector from 2 wheel to 4 wheel, I hear the actuator pump going to town. Most posts here on the forum say the pump should only be working for about 30 seconds to actuate into 4x4. Mine now seems to pump forever. So I was thinking leak, but I took it to a place today to look at it and they said nothing seemed wrong but they felt like they were really unfamiliar with the 4x4 system.
I was stuck recently (in a 4 foot snowdrift) and really gave the 4X4 a workout right before experiencing this problem. Other than that the ball joints were replaced earlier that day, but I am told the hub assembly was not taken apart to replace the joints.
Tuned
Joined: Jun 2006
Posts: 453
Likes: 1
From: Montana
The hubs slipping out of 4x4 I would guess a vacum leak or some trashed hubs. is the whine in 4x4 or 2x4 or both? as far as the transfer case issue your gonna have to wait for someone smarter than me. If you want I can find a write up on changing the hubs. whats the info on your truck?
Elder User
Joined: Nov 2006
Posts: 824
Likes: 1
From: Iowa
Get a vacuum guage and hook it into the vacuum line for the hubs. To find the line just look under the fender and over top of the tire. It is straight down. Start the truck and turn the dial. The guage should move. turn the **** again and guage should move.
It will whine if the hubs are not unlocked completely.
It will whine if the hubs are not unlocked completely.
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ok so hub hold vacuum, but it seems the line to the driver side hub is not putting out any pressure. I checked line all way back to something that looks like air solenoid. It takes a line in from the vacuum reservoir and a line out to the driver side hub. When I pull this line-in/line out the air is coming in. When I reattach with just the line-in, I get nothing coming out.
Also when I pull the line for the passenger side hub, I get pressure. I have heard people talk here about the vacuum actuator. Anyone know if this is what I am talking about. It has some wire plugged into the top of it and it sits on the fender well right next to the pump and reservoir.
Also when I pull the line for the passenger side hub, I get pressure. I have heard people talk here about the vacuum actuator. Anyone know if this is what I am talking about. It has some wire plugged into the top of it and it sits on the fender well right next to the pump and reservoir.
Elder User
Joined: Sep 2004
Posts: 851
Likes: 0
From: N. Georgia
PVH (pulse vacuum hublock solenoid) may have a leak in it. The only way I know to fix the pvh is drive a new one under it.
Joe
Joe
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