4A question.
Thread Starter
F-150 Fanatic
Joined: Jun 2015
Posts: 348
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From: North Texas
4A question.
I searched and did not find an answer to what I am looking for.
I put the truck in 4A earlier to check it out, but was curious about something.
Traditional 4x4 4H tells me that the maximum safe speed while engaged is ~55 mph. Does this apply in 4A as well? Or is the system smart enough to figure that out and disengage above certain speeds like the locking rear differential does?
I put the truck in 4A earlier to check it out, but was curious about something.
Traditional 4x4 4H tells me that the maximum safe speed while engaged is ~55 mph. Does this apply in 4A as well? Or is the system smart enough to figure that out and disengage above certain speeds like the locking rear differential does?
Last edited by blairian; Nov 14, 2015 at 07:21 PM.
10 Year Member
Joined: Mar 2015
Posts: 1,016
Likes: 213
From: East Central Illinois
I searched and did not find an answer to what I am looking for.
I put the truck in 4A earlier to check it out, but was curious about something.
Traditional 4H tells me that the max speed while engaged is ~55 mph. Does this apply in 4A as well? Or is the system smart enough to figure that out and disengage above certain speeds like the locking rear differential does?
I put the truck in 4A earlier to check it out, but was curious about something.
Traditional 4H tells me that the max speed while engaged is ~55 mph. Does this apply in 4A as well? Or is the system smart enough to figure that out and disengage above certain speeds like the locking rear differential does?
Senior Member
Joined: Jun 2011
Posts: 297
Likes: 83
4a can be used all the time. Go into your owner distribution menu and select the screen that shows where power is flowing and you will see 4a switches between 4 wheel and 2 wheel at different settings. Also you do not get the binding that you normally would in 4hi.
Also look in owners manual, this is directly out of it
4A (4X4 AUTO)
Provides electronic control four-wheel drive with power delivered to the front and rear wheels, as required, for increased traction. This is appropriate for all on-road driving conditions, including dry road surfaces, but is especially useful on wet pavement, snow, dirt, or gravel.
http://www.fordservicecontent.com/Fo...G1679348&div=fhttp://www.fordservicecontent.com/Fo...G1679348&div=f
Also look in owners manual, this is directly out of it
4A (4X4 AUTO)
Provides electronic control four-wheel drive with power delivered to the front and rear wheels, as required, for increased traction. This is appropriate for all on-road driving conditions, including dry road surfaces, but is especially useful on wet pavement, snow, dirt, or gravel.
http://www.fordservicecontent.com/Fo...G1679348&div=fhttp://www.fordservicecontent.com/Fo...G1679348&div=f
Thread Starter
F-150 Fanatic
Joined: Jun 2015
Posts: 348
Likes: 58
From: North Texas
Originally Posted by tsdahc
4a can be used all the time. Go into your owner distribution menu and select the screen that shows where power is flowing and you will see 4a switches between 4 wheel and 2 wheel at different settings. Also you do not get the binding that you normally would in 4hi.
Also look in owners manual, this is directly out of it
4A (4X4 AUTO)
Provides electronic control four-wheel drive with power delivered to the front and rear wheels, as required, for increased traction. This is appropriate for all on-road driving conditions, including dry road surfaces, but is especially useful on wet pavement, snow, dirt, or gravel.
http://www.fordservicecontent.com/Fo...G1679348&div=fhttp://www.fordservicecontent.com/Fo...G1679348&div=f
Also look in owners manual, this is directly out of it
4A (4X4 AUTO)
Provides electronic control four-wheel drive with power delivered to the front and rear wheels, as required, for increased traction. This is appropriate for all on-road driving conditions, including dry road surfaces, but is especially useful on wet pavement, snow, dirt, or gravel.
http://www.fordservicecontent.com/Fo...G1679348&div=fhttp://www.fordservicecontent.com/Fo...G1679348&div=f
Senior Member
Joined: Mar 2015
Posts: 177
Likes: 59
It will hamper your fuel economy, regardless of whether or not the front tires are being powered. It is, however, the most economic 4 wheel drive system you can get.
The logic behind it isn't quite as good as I'd like, though. Watching the "power distribution" page, I see that 4 wheel drive is fully engaged very often without traction loss or possibility of traction loss. Every time I begin accelerating from a stop or near-stop, it will engage, regardless of the speed in which I'm accelerating. It'll continue to be engaged for the next 30 seconds or so, even if I remove my foot from the accelerator and reapply.
The logic behind it isn't quite as good as I'd like, though. Watching the "power distribution" page, I see that 4 wheel drive is fully engaged very often without traction loss or possibility of traction loss. Every time I begin accelerating from a stop or near-stop, it will engage, regardless of the speed in which I'm accelerating. It'll continue to be engaged for the next 30 seconds or so, even if I remove my foot from the accelerator and reapply.