Torque Bind?
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New User
Joined: Jul 2007
Posts: 4
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From: Newport, RI
I finally figured out that front hubs are not fully unlocking which accounts for the bump, bump, bump while steering in tight turns. The hubs are not fully unlocking because of a vacuum problem (I think) which I have now learned has also effected air flow in the heating/cooling system. Bottom line is that right now air ONLY blows out of the defrost vents on top of the dash and not out of the front or down at my feet, regardless of where I select on the A/C control
I replaced a $45 dollar vacuum module (don't know the technical name) two times in the past 10 days and both times it temporarily fixed the air flow problem. But as soon as I switch to 4x4 the airflow problem returns AND the front hubs are still partially locked.
The problem lies in the $45 vacuum module. As of now we don't know if we are permanently damaging the part when we switch to 4x4 OR if there is a valve or something inside the module that is not electronically opening or closing in order to control the 4x4 AND air flow. Anyone got any good ideas?
I replaced a $45 dollar vacuum module (don't know the technical name) two times in the past 10 days and both times it temporarily fixed the air flow problem. But as soon as I switch to 4x4 the airflow problem returns AND the front hubs are still partially locked.
The problem lies in the $45 vacuum module. As of now we don't know if we are permanently damaging the part when we switch to 4x4 OR if there is a valve or something inside the module that is not electronically opening or closing in order to control the 4x4 AND air flow. Anyone got any good ideas?
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Originally Posted by redford
To experience this for yourself, lock your hubs without engaging the transfer case, crank your steering wheel to full lock left or right and drive forward slowly.
You'll feel the binding of the U-joints on the drive axle.
You'll feel the binding of the U-joints on the drive axle.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Originally Posted by Jenks Reid
The problem lies in the $45 vacuum module. As of now we don't know if we are permanently damaging the part when we switch to 4x4 OR if there is a valve or something inside the module that is not electronically opening or closing in order to control the 4x4 AND air flow. Anyone got any good ideas?
You can also observe how the hubs operate and even narrow down to one side or the other. Remove the vacuum hose from the back of one hub. Hook the hand pump or just a plain vacuum guage to the hose. activate the 4x4. You will see the vacuum go up to 15 in. and then drop. Disengage 4x4. You should see a lower vacuum reading around 7 in, then drop. If not that means the opposite side wheel hub system has a leak.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 420
From: Long Island USA
Originally Posted by aldridgec
Symantics I think. I wouldn't call this torque bind, just typical u-joint issues from the high angle. I consider torque bind when it is hard to move forward while turning sharply on a surface without low traction an in 4x4
No biggee
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Originally Posted by Jenks Reid
I finally figured out that front hubs are not fully unlocking which accounts for the bump, bump, bump while steering in tight turns. The hubs are not fully unlocking because of a vacuum problem (I think) which I have now learned has also effected air flow in the heating/cooling system. Bottom line is that right now air ONLY blows out of the defrost vents on top of the dash and not out of the front or down at my feet, regardless of where I select on the A/C control
I replaced a $45 dollar vacuum module (don't know the technical name) two times in the past 10 days and both times it temporarily fixed the air flow problem. But as soon as I switch to 4x4 the airflow problem returns AND the front hubs are still partially locked.
The problem lies in the $45 vacuum module. As of now we don't know if we are permanently damaging the part when we switch to 4x4 OR if there is a valve or something inside the module that is not electronically opening or closing in order to control the 4x4 AND air flow. Anyone got any good ideas?
I replaced a $45 dollar vacuum module (don't know the technical name) two times in the past 10 days and both times it temporarily fixed the air flow problem. But as soon as I switch to 4x4 the airflow problem returns AND the front hubs are still partially locked.
The problem lies in the $45 vacuum module. As of now we don't know if we are permanently damaging the part when we switch to 4x4 OR if there is a valve or something inside the module that is not electronically opening or closing in order to control the 4x4 AND air flow. Anyone got any good ideas?
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