2H or 4A

Id recommend you use 4A if you have it. I mentioned it in the other thread, but essentially the computer of the vehicle will tell which wheels to activate when needed. It’s essentially AWD, which a lot of vehicles come in these days as their only option. My wife’s Mazda CX30 is AWD, no other option. The computer senses when a wheel starts to lose traction and adjusts accordingly. It is not always giving power to all four wheels, so you won’t destroy your drivetrain like if you ran 4WD at highway speeds on dry pavement. It’s sort of similar to traction control in regard to it regulating itself.

thgdfathr

Id recommend you use 4A if you have it. I mentioned it in the other thread, but essentially the computer of the vehicle will tell which wheels to activate when needed. It’s essentially AWD, which a lot of vehicles come in these days as their only option.

That's what I was thinking. in 4A mode, my wife and I will surely not drive anything else. It's all wheel/we'll drive.

It seems apparent to me that there is no good reason at all to use 2H in a Bronco that is equipped with 4A, but I wanted to be sure. Any advantage at all to ever using 2H instead of 4A?

Should clarify, I’d personally use 4A in rain/ snow, 2H in dry pavement conditions. You are essentially engaging the transfer case to be primed to activate 4WD when it detects slippage. Some people say this may cause a drop in MPG, but not sure if that’s validated. If it’s dry outside and you aren’t worried about slippage, I’d stick with 2H.

Somebody actually asked this exact question at off-roadeo. The guides gave kind of a half hearted response the 2h was optimal for normal driving conditions, and 4a was good for on pavement conditions where additional traction might be needed like rain or snow. They were a lot more interested in talking about 4h and 4l that should not be used on pavement.

Bob Blaylock

Similar to the 2H or 4H thread.

I understand why 4H and 4L should not be used on hard, dry surfaces, why if you don't have the Advanced 4x4 with Full Time Drive, you should stay in 2H unless you're in low-traction conditions.

What about the 4A mode, on vehicles so equipped. Is there any reason not to use it all the time, instead of 2H? I presume it's smart enough to avoid the issues that can happen with 4H or 4L on hard, dry, good-traction surfaces, right?

4auto is basically AWD. Fine for dry surfaces and is amazing performance wise. It might take a little off your gas mileage but the reward is worth it.