Low range 2 wheel drive
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New User
Joined: Oct 2006
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Low range 2 wheel drive
I would like the option to have 2 wheel drive low range for backing the trailer. If I pull the number 39 fuse (4x4 hub lock) will the transfer case still shift to low range but the auto hubs not engage?
My last super duty (2002) I just used a golf tee to plug a vacuum line but this 2015 model is a little different.
I also read somewhere to put a toggle switch on the red wire going to the pulse vacuum hub lock but I think pulling a fuse would be the easiest way.
Any suggestions?
My last super duty (2002) I just used a golf tee to plug a vacuum line but this 2015 model is a little different.
I also read somewhere to put a toggle switch on the red wire going to the pulse vacuum hub lock but I think pulling a fuse would be the easiest way.
Any suggestions?
Elder User
Joined: Mar 2005
Posts: 526
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From: New Jersey
It would be best to put the model/year of your truck in your signature to help people assist you so we know exactly what we are talking about and provide more accurate advice.
The "Constant Vacuum Hub Lock Solenoid" is actually conveniently mounted on the back of your primary coolant degas bottle. It would be simpler to just disconnect it than pull the fuse in my opinion. If you need to do this a lot then you could also trick this out if you have upfitter switches. You can use a relay to open the circuit when you need to disable it simply by turning on a switch on your dash. This will likely leave a code in the transfer case control module but you can ignore it since you know the circuit was modified and you can ignore it.
Just to satisfy my curiosity, what is the problem with having the front axles engaged when maneuvering a trailer? Axle wind-up would be my only guess.
The "Constant Vacuum Hub Lock Solenoid" is actually conveniently mounted on the back of your primary coolant degas bottle. It would be simpler to just disconnect it than pull the fuse in my opinion. If you need to do this a lot then you could also trick this out if you have upfitter switches. You can use a relay to open the circuit when you need to disable it simply by turning on a switch on your dash. This will likely leave a code in the transfer case control module but you can ignore it since you know the circuit was modified and you can ignore it.
Just to satisfy my curiosity, what is the problem with having the front axles engaged when maneuvering a trailer? Axle wind-up would be my only guess.
Senior User
Joined: Mar 2003
Posts: 366
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From: Aloha (Portland), OR USA
Fortunately my hubs are purely manual, but it would be nice on a newer truck to rig an upfitter switch to engage the hubs, since, where I park at home, I do have to get out and lock the hubs once I get off the road, as I have to back up a steep gravel driveway and the truck just spins out if it's not in 4wd.
Lead Driver
Joined: Apr 2011
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From: Edmonton Alberta
Cargo Master
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bigdawg460
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