@Fisher23 ATRAC, Quadra Trac II (which uses clutches which can overheat when adjusting power output under heavy load for about 30 minutes, unlike a Torsen center diff, I’ve seen it personally quite often in the sand), and CRAWL are NOT the problem I’m talking about with automatic lockers.
Those electronic (uses brakes force) traction aid only engage when on and detect slippage. If you never slip, it won’t engage, even when they are turned on. Easy.
The issue is the mechanical center open differential on a hard surface like a paved road (kinda going back to the earlier comment about QTII uses clutches as it’s center diff, but the 200 uses a much more robust limited slip mechanical differential). Now if you put an automatic rear locker like a Detroit in there, make turns while applying a little accelerator pedal, it’s going to lock up and send power 50/50, left and right. That is now going to bind and power is going to try and go to the patch of least resistance... the front. But the 200 isn’t an all wheel drive that can send up 90% of its power to the front, it’s full time 4 wheel drive and is setup to only send up to 60% of its power to the front.
Because the front is still open, you can have up to 60% of that power now pushed to one front wheel and it’s going to happen while turning on roads. Pavement is high traction and not going to let go. Then you will start to get chirping. When the only place left for a tire to go after it’s buuld up so much energy from the drivetrain, but is being Hald to the ground beucase of traction, the tire/pavement contact will finally break and the tire will pop up off the ground, rotate to free the load, then hit again. It will do that over and over until you stop turning or applying the accelerator pedal.
Now, none of this matter in you other vehicles you mentioned, as those still can either not send power at all to the front, or so much of it the rear locker doesn’t matter, it’s when it only send half the power that’s the problem.
That’s why an automatic is bad in a full time 4wheel drive. It’s not beucase of off roading, it’s from driving on paved roads.
Right now, for guys that have 200s, when you are in a parking lot, and you hear that tire squeal when making turns unlike a front, rear, or part-time 4wd, or all wheel drive? That’s binding within the drivetrain that just on the edge of reason that Toyota accepts (beucase the LC is so off-road oriented, it can’t even go into 2wd, haha) anyway. Now imagine if you messed with that and gave, even more power to a front tire, the one that require the least power when turning. See the issues that can be cause from a rear automatic locker in this particular vehicle?
Hopefully that makes sense, I’d be happy to explain it in a different way. Ugh... I hate typing this stuff out, which I could just explain it in person.
