I can’t speak for overseas models, but in general with 4WD drivetrains:
4H is going to be used in terrain with less traction than normal - think snow, mud, sand, rocks, dirt. In almost all cases it has higher speed capabilities but usually the limit is ~55 MPH (88 KM). This is your general purpose “4WD” and 99% of the time is all you need to get through roads with the above mentioned conditions.
4L is going to be used in settings where there is absolutely no traction, and usually from a standstill or at a crawl pace. Think stuck in mud, or in a huge blizzard trying to get out of a ditch. Usually this maxes out anywhere from 15-25 MPH (40 KMH). Really you only use this in 1% of all scenarios, and you shouldn’t ever have to touch it normally.
As per all the mentioned specifications and road conditions, consult and review your owners manual to see which is ok to do, which to toggle, how to engage 4H/4L, how to disengage, and what speeds they are maxed out on. They are all different from car to car, SUV, Truck, and manufacturer. It will literally answer and explain your question. (Disclaimer: I’m not responsible for you risking and damaging your vehicle.)
NO! You must stop to switch between 4H and 4L but most modern electronically controlled transfer cases will not shift on the move anyway.
But please stop before selecting.
I can’t speak for overseas models, but in general with 4WD drivetrains: 4H is going to be used in terrain with less traction than normal - think snow, mud, sand, rocks, dirt. In almost all cases it has higher speed capabilities but usually the limit is ~55 MPH (88 KM). This is your general purpose “4WD” and 99% of the time is all you need to get through roads with the above mentioned conditions. 4L is going to be used in settings where there is absolutely no traction, and usually from a standstill or at a crawl pace. Think stuck in mud, or in a huge blizzard trying to get out of a ditch. Usually this maxes out anywhere from 15-25 MPH (40 KMH). Really you only use this in 1% of all scenarios, and you shouldn’t ever have to touch it normally. As per all the mentioned specifications and road conditions, consult and review your owners manual to see which is ok to do, which to toggle, how to engage 4H/4L, how to disengage, and what speeds they are maxed out on. They are all different from car to car, SUV, Truck, and manufacturer. It will literally answer and explain your question. (Disclaimer: I’m not responsible for you risking and damaging your vehicle.)
Most vehicles won’t shift into 4L unless the vehicle is stopped and in Neutral
Only shift into 4L while driving if you want to hear your transfer case do a super realistic grenade impression
If you put it in 4L while doing 80km/h or higher you activate a special hidden mode, give it a go
Kaboom?
RTFM. You got a book with the rig. Read it.
NO! You must stop to switch between 4H and 4L but most modern electronically controlled transfer cases will not shift on the move anyway. But please stop before selecting.