[DAF54]

Hi all. I'm the new owner of a 2020 TRD ORP. While I've driven 4WD vehicles over 30 years, this is my first experience with anything other than a GM product. In the past I've always ordered trucks with what GM refers to as a "locking" or "limited slip" rear differential. If a rear wheel spins, the diff locks and both get power, even in 2WD.

I've read the manual and it appears ATS and differential lock are solely 4LO features. Does my new 4R have a limited slip rear differential? Put another way, if I get one rear and one front wheel stuck in 4HI am I stuck? Do I have to shift to 4LO to get power to more than two wheels?

Thanks for any guidance.

[spartacus]

Originally Posted by DAF54

Hi all. I'm the new owner of a 2020 TRD ORP. While I've driven 4WD vehicles over 30 years, this is my first experience with anything other than a GM product. In the past I've always ordered trucks with what GM refers to as a "locking" or "limited slip" rear differential. If a rear wheel spins, the diff locks and both get power.

I've read the manual and it appears ATS and differential lock are solely 4LO features. Does my new 4R have a limited slip rear differential? Put another way, if I get one rear and one front wheel stuck in 4HI am I stuck? Do I have to shift to 4LO to get power to more than two wheels?

Thanks for any guidance.

You are spot on. you can lock the rear to get more traction with the rear locked it's pretty much unstoppable in most intances also the crawl control feature the driver essentially controls the steering and the truck does the rest low for rocks, Medium for steep grades and high for mud, snow loose gravel etc. Read the owners manual it explains better.

[Whippersnapper02]

Originally Posted by DAF54

Hi all. I'm the new owner of a 2020 TRD ORP. While I've driven 4WD vehicles over 30 years, this is my first experience with anything other than a GM product. In the past I've always ordered trucks with what GM refers to as a "locking" or "limited slip" rear differential. If a rear wheel spins, the diff locks and both get power, even in 2WD.

I've read the manual and it appears ATS and differential lock are solely 4LO features. Does my new 4R have a limited slip rear differential? Put another way, if I get one rear and one front wheel stuck in 4HI am I stuck? Do I have to shift to 4LO to get power to more than two wheels?

Thanks for any guidance.

Both front and rear(until locked) diffs are open. Any slip control comes from the brakes which are computer controlled. The locker will both both wheels together to keep power from going to the one without traction.

ATRAC and crawl control are the systems that control wheel slip at all 4 corners. Crawl control is more of an offroad cruise control though.

[DAF54]

So if I am understanding the replies, I have open diffs in 2WD and 4HI? And in 4LO too unless I engage ATRAC or manually lock the rear diff?

[jhguth]

Originally Posted by DAF54

So if I am understanding the replies, I have open diffs in 2WD and 4HI? And in 4LO too unless I engage ATRAC or manually lock the rear diff?

atrac is still an open diffs, it applies brakes for traction control

you can lock your rear diff in 4lo, all other times you have open diffs

you can modify the vehicle to use the rear locker in 4hi, but if you're wheeling you should be in 4lo anyways

[Cndnmax]

Dif lock and Atrac will only work in 4lo unless you do the Mod that tricks the vehicle into letting you activate those features in any mode.

That said, you still have traction control and the abs system will still try to limit wheel spin in any mode unless you turn it off manually. The normal traction control just won’t be as aggressive as atrac.

[DAF54]

Originally Posted by Cndnmax

Dif lock and Atrac will only work in 4lo unless you do the Mod that tricks the vehicle into letting you activate those features in any mode.

That said, you still have traction control and the abs system will still try to limit wheel spin in any mode unless you turn it off manually. The normal traction control just won’t be as aggressive as atrac.

That's good news. While I hope to get it out on a trail, I am much more likely to encounter a soggy field or a few inches of snow in my subdivision. The prospects of having to put it in 4LO every time I needed both rear wheels pulling was disappointing.

[BobsTrail]

Your T4 has Multi-Terrain control that works in 4H and 4L. In 4H it will allow some wheel spin but brakes the slipping wheel. It works well and I get good use out of mine. In 4L there are additional positions for the M/T that will allow less slip. And ATRAC which is the least slip. For most loose conditions I always use M/T in either 4H or 4L and that's usually enough. I rarely use/need the locker.

In 2WD and 4H there is traction control but most don't like it. It cuts engine power when active. That's why I use M/T.

Find some loose dirt or even a wet road in a tight turn and play with it with 2WD and 4H with and without Trac, then with 4H and M/T you will find it will handle the slippage very well. To disable Trac, push and hold the button for a few seconds.

The book is nice, but take it out and play with the settings to find out what really happens.