4wd questions
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Senior User
Joined: Mar 2004
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4wd questions
I have had my 99 F350 PSD for two months, and never needed to engage the 4wd. I seem to remember checking the 4wd to make sure it was working, but now I am not so sure.
Apparently, the former owner changed out the automatic locking hubs for warn manual locking hubs, and blocked off the vacuum lines to the hub.
The 4wd indicator lights only come on when the engine is first started.
How can I tell if the truck is actually engaging in 4wd.
I have tried moving it with the hubs locked, and the front shaft turns. But it also turns when it is in 2wd.
I have tried moving it with the hubs unlocked and the front shaft does not turn whether it is in 2 or 4wd.
Logically, I would think that when the transfer case is engaged into 4wd, that the front shaft would be turning, even when the manual hubs are NOT engaged.
I changed the shifter motor thinking that was the problem.
Not sure what to do next, and I hate to bring it into the dealership.
Any ideas will be appreciated!
Apparently, the former owner changed out the automatic locking hubs for warn manual locking hubs, and blocked off the vacuum lines to the hub.
The 4wd indicator lights only come on when the engine is first started.
How can I tell if the truck is actually engaging in 4wd.
I have tried moving it with the hubs locked, and the front shaft turns. But it also turns when it is in 2wd.
I have tried moving it with the hubs unlocked and the front shaft does not turn whether it is in 2 or 4wd.
Logically, I would think that when the transfer case is engaged into 4wd, that the front shaft would be turning, even when the manual hubs are NOT engaged.
I changed the shifter motor thinking that was the problem.
Not sure what to do next, and I hate to bring it into the dealership.
Any ideas will be appreciated!
Elder User
Joined: Sep 2004
Posts: 851
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From: N. Georgia
When you shift the ESOF switch to 4wd high it should engage the front end. If the hubs are not locked, the power stops before the wheels. Shift it into 4wd low and the transfer case downshifts into low, keeps the frontend engaged. If the hubs aren't locked, the power stops before the wheels (2wd low). If the hubs are locked in either case the power continues through the wheels and you have 4wd. If you don't get out and lock the hubs you don't have 4wd at all. I hope this makes sense.
Joe
Joe
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Senior User
Joined: Mar 2004
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Thanks Joe,
So my front shaft SHOULD be turning when the 4wd is engaged, whether or not the hubs are locked.
It is not.
I changed the shifter motor, the connections look good, but I put dielectric silicone on them anyway.
Checked all the fuses.
Is it possible that it is the switch on the dash that is bad??
So my front shaft SHOULD be turning when the 4wd is engaged, whether or not the hubs are locked.
It is not.
I changed the shifter motor, the connections look good, but I put dielectric silicone on them anyway.
Checked all the fuses.
Is it possible that it is the switch on the dash that is bad??
Fleet Mechanic
Joined: Feb 2004
Posts: 1,816
Likes: 3
From: River Valley AR
If your 4wd is working you should feel a steering bind when you make a sharp turn. I wouldn't try it on asphalt, but you will feel it hopping and bucking a little when 4wd is working. Try a hard surface that will give a little, like a gravel drive or your neighbor's grass. If the steering feels the same as 2wd it's probably not working.
Elder User
Joined: Sep 2004
Posts: 851
Likes: 0
From: N. Georgia
Originally Posted by arjr111
Thanks Joe,
So my front shaft SHOULD be turning when the 4wd is engaged, whether or not the hubs are locked.
It is not.
I changed the shifter motor, the connections look good, but I put dielectric silicone on them anyway.
Checked all the fuses.
Is it possible that it is the switch on the dash that is bad??
So my front shaft SHOULD be turning when the 4wd is engaged, whether or not the hubs are locked.
It is not.
I changed the shifter motor, the connections look good, but I put dielectric silicone on them anyway.
Checked all the fuses.
Is it possible that it is the switch on the dash that is bad??
Joe
Thread Starter
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Senior User
Joined: Mar 2004
Posts: 137
Likes: 0
have you checked at the transfer case to see if you have power down there when the switch is engaged
Course, this had to happen right before we are scheduled to head out on vacation, which means no 4 wheeling.
