Can’t Make Sharp Turns in 4H drive

[Lexington]

I also have a USMC HMMWV. It’s a AWD and 4WD. It normally drives in a type of AWD but if I put it in 4H then it locks the differential and it becomes 4WD. So with the Trooper, Subaru and the HMMWV I was used to not having any problems turning. When I first put the 4R into 4H I was expecting it to drive like my other cars. It threw me off. Now I understand why. It would be nice if they made the 4R like the HMMWV where is normally drives in AWD the have the option to switch to 4WD. But I don’t know if that would affect the 4R famous reliability

 

[SpeedyKevin]

I also have a USMC HMMWV. It’s a AWD and 4WD. It normally drives in a type of AWD but if I put it in 4H then it locks the differential and it becomes 4WD. So with the Trooper, Subaru and the HMMWV I was used to not having any problems turning. When I first put the 4R into 4H I was expecting it to drive like my other cars. It threw me off. Now I understand why. It would be nice if they made the 4R like the HMMWV where is normally drives in AWD the have the option to switch to 4WD. But I don’t know if that would affect the 4R famous reliability

Limited drives like that. Costs toyota more likely. Lc80s are also full time 4wd

 

[Toffees]

If your Isuzu had all wheel drive then it had a center differential and not a transfer case. In the 5th Gen 4runner the transfer case spins all 4 wheels at the same speed causing it to bind. limited 4runners have a differential and a transfer case for full time all wheel drive and 4lo that locks the center transfer case.

They do make a 4Runner in that flavor. It's called a limited. Has AWD + locking center diff and transfer case

A 2WD option seems a bit more fuel efficient, maybe cheaper to make :noidea:

To clarify for other readers, the LE has FT4WD, 4HI, and 4LO. So it has AWD when 4HI is not engaged, then it was 4WD when 4HI is engaged and the torsen diff is locked. The torsen diff is also locked in 4LO.

 

[Lexington]

To clarify for other readers, the LE has FT4WD, 4HI, and 4LO. So it has AWD when 4HI is not engaged, then it was 4WD when 4HI is engaged and the torsen diff is locked. The torsen diff is also locked in 4LO.

Ok, now I fully understand why I was confused about the 4WD. Trooper has a unique system. It normally drove as a 2WD but there was a 4WD button which was also called (Torque On Demand). Now I understand the the 4WD (TOD) button when engaged was actually a AWD and not a 4WD. So they labeled a part time AWD as 4WD. And since I only owned a Trooper for the last 25 years, this is what led to my confusion. However, it also had what was labeled as off-road 4WD in 4H & 4L. I now realized that the off-road locked the differentials. But even when I drove off road in the Sierra Mountains I almost never had to use the Off-Road gears. The TOD was capable of handling the dirt roads in the mountains except when climbing or descending steep hills. That was the only time I had to use the 4H or 4L which was not very often.

The LE mentioned above does explain how my HMMWV operates. It’s a full time AWD and a 4H & 4L. I will tell you that when the drive gear is in L and the 4L is engaged it is king! Almost nothing will stop that vehicle!

Thank you everyone for help in clearing this up for me.

 

[Toffees]

Ok, now I fully understand why I was confused about the 4WD. Trooper has a unique system. It normally drove as a 2WD but there was a 4WD button which was also called (Torque On Demand). Now I understand the the 4WD (TOD) button when engaged was actually a AWD and not a 4WD. So they labeled a part time AWD as 4WD. And since I only owned a Trooper for the last 25 years, this is what led to my confusion. However, it also had what was labeled as off-road 4WD in 4H & 4L. I now realized that the off-road locked the differentials. But even when I drove off road in the Sierra Mountains I almost never had to use the Off-Road gears. The TOD was capable of handling the dirt roads in the mountains except when climbing or descending steep hills. That was the only time I had to use the 4H or 4L which was not very often.

The LE mentioned above does explain how my HMMWV operates. It’s a full time AWD and a 4H & 4L. I will tell you that when the drive gear is in L and the 4L is engaged it is king! Almost nothing will stop that vehicle!

Thank you everyone for help in clearing this up for me.

Technically, the FT4WD in the LE is distinct from AWD, but for most people, probably you and me and at least half the forum, I think simplifying it as AWD is more appropriate because at the AWD/FTAWD setting the driver is passive and the system is active. My previous truck (Honda AWD) also had a "4WD mode" but what it does is lock the rear wheels (it's front drive) in AWD so all wheels are "in AWD."

In any case, all of these modes are distinct from 4HI in the LE.