Originally Posted by dragr1
Thank you, that helps a lot
I hope it does help, do keep in mind that since I wrote that post, there was some changes made in 2012 to the TRAC/AUTO LSD system in H4, perhaps adding a 10th drive mode choice?
Also, A-TRAC is fantastic... this is coming from someone who had an 2001 4WD Off Road and a 2005 4WD Off Road before... the rear locker is great, but A-TRAC gives you locker-like traction on the front and rear tires!
A-TRAC only comes on with the A-TRAC button depressed, in L4. So, if you want free spinning, open differential action, just leave it off or turn it off. However, if you ever come to the foot of a near-cliff you want to climb... or a mud bog you want to cross... or got stuck because it was off when it could have been on... Press the A-TRAC button!
In H4, you also can de-activate the traction control as it is normally on in H4 (and H2) because of the superior traction improvement over simple open differentials. Here's how: Stop the truck, press and hold in the VSC Off switch until VSC Off light comes on (about 3-5 seconds). VSC and TRAC are both de-activated until you press the button again, or re-start your truck, or do something that could cause a roll over.
I have run many comparison tests, and H4 with TRAC will-out climb L4 without A-TRAC.
The rear locker takes you further, naturally... and A-TRAC will get you beyond all other choices that come stock on a new Tacoma. You can have both back tires off the ground (spinning, even with a locker on) and if only one front tire with good traction, the A-TRAC will pull you out of the stuck, even if uphill! Without A-TRAC (or an after-market front locker) you would be stuck, since an open differential will power the tire that spins the easiest, not the one that will pull you out!