4x4 Automatic question

[JimJa]

The question is how does 4A operate. I've tested the truck in both 4A and 4H on ice and 4A seems to be ineffective until the rear wheels slip then engagement is a little abrupt and noticeable, as though there is no power sent to the front wheels until rear slippage. This is particularly noticeable when compared to 4H. It was my understanding on earlier Fords, 4A mode sent about 35% of the torque to the fronts all the time and ratcheted up that percentage based or rear wheel wheel slippage.

When driving at speed on patchy highway snow/ice having some torque at the front all the time would seem a better solution. More wear on the clutch pack for sure, but more controllable.

Do the rear wheels have to slip before engagement, or is some power provided through the clutch pack all the time once engaged? How much?

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[Jason B]

I think 4A is as you stated, 4X4 is engaged when needed.
What you are thinking of is maybe 'AWD' All Wheel Drive, where there is always power to front and rear axles.
Googling this, it seems that people are saying that 4A is the same as AWD.

The manual says:

How Does Four-Wheel Drive Work - Advanced 4x4 with 4A Mode

Advanced 4x4 With Automatic On Demand Engagement (If Equipped)
This system monitors various vehicle sensory inputs to provide an increased level of performance. This system offers the driver two-wheel drive high (2H), four-wheel drive auto (4A), four-wheel drive high (4H) and four-wheel drive low (4L) as available modes of operation.
When you select four-wheel drive auto (4A), the system continuously varies power to the front wheels for optimum performance for all on-road conditions.
When you select four-wheel drive high (4H) or four-wheel drive low (4L), the system provides electronically locked power to the front and rear wheels for use in off-road or slippery conditions such as deep snow, sand or mud.
Selecting four-wheel drive low (4L) also provides additional gearing for increased torque multiplication for conditions like deep sand, steep slopes, or pulling heavy objects.

 

[superj]

Do all 4x4 rangers have 4a?

 

[Awirez]

Do all 4x4 rangers have 4a?

Only Raptors. XL, XLT, Lariat are considered part time 4WD; meaning you have to select 4H or 4L.

 

[superj]

Ok. Thank you

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