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Old 01-06-2014, 01:40 PM   #1
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Question Low range 4X2 conversion

On my old F350 4X4 I was able to disable the front hub activators and then use the low range in the transfer case to make moving/jockeying/hitching up the fifth wheel much easier. With the part time 4X4 it is very hard on the drivetrain to turn on hard ground or pavement. Has anyone done this with an F150? The diesel 350 had vacuum motors on the hubs to engage/disengage but I don't know about the newer 150 s....?
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Old 01-06-2014, 03:53 PM   #2
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I could be done but will require some work. The front hubs on the F150 are naturally engaged. To disengage the front hubs vacuum must be applied. So while driving in 4X2 mode, the EWE solenoid is allowing vacuum to be applied to the front hubs. If the solenoid is turned off or there is a vacuum leak, the front hubs will engage. The easiest way I can think of is to make a small vacuum loop at the solenoid. It is on the fire wall passenger side. The other way is to splice in a switch to command the solenoid on to unlock the hubs.
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Old 01-06-2014, 04:19 PM   #3
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Quote:
Originally Posted by jamesrxx951 View Post
I could be done but will require some work. The front hubs on the F150 are naturally engaged. To disengage the front hubs vacuum must be applied. So while driving in 4X2 mode, the EWE solenoid is allowing vacuum to be applied to the front hubs. If the solenoid is turned off or there is a vacuum leak, the front hubs will engage. The easiest way I can think of is to make a small vacuum loop at the solenoid. It is on the fire wall passenger side. The other way is to splice in a switch to command the solenoid on to unlock the hubs.
Great information. That (the switch for the solenoid) is what I did on the 350. Hadn't realized they used the same system for the 150. One difference I see is that when I had a vacuum leak on the 350 it failed to engage the hubs ....There was something about a vacuum pulse being involved but I don't recall the exact info a sit was nearly 10 years ago!!
On edit
I know that this 150 has a vacuum pump like the diesel but has assumed it was to aid the brake booster as the diesel used the power steering pump for that.
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Old 01-06-2014, 07:49 PM   #4
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I would also eliminate the front locking electrically. Good info above.
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