The E-brake trick does work with TrueTrac

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   Today I came up on a fairly steep little climb with a twisty section.       I was sure there was no way it would make it in 2wd so pulled the 4wd lever.   My '2A has e-locker in front and TrueTrac in rear.   I debated on activating the front locker,  because I wanted to "tread lightly" and not spin tires.    Instead I decided to see if it would make it without the locker.     As I suspected,  it started spinning when it got crossed up.  (Open in front, and the TrueTrac was basically open because one tire had very little traction)
Instead of activating the front locker,   I thought I would try the emergency brake trick again.  (I tried testing it when I first put in the TrueTrac,  but it did not seem to make difference)  To my amazement,  it crawled up that section without slipping a tire at all.       It worked this time!

In another thread Nothing Special described how this works,   will share that for reference.  

 Nothing Special wrote:

. . .On the other hand a Truetrac is completely free when going around corners, but will transfer more torque to the tire with more traction.  That means it completely avoids what I find annoying in clutch-type limited slips.  Also, unlike a clutch-type that adds a set amount of torque, a Truetrac multiplies, giving something like 3.5 times as much torque to the tire with more traction.    If both tires get some traction it will almost always not spin just one tire.  But if one tire is in the air it send 3.5 x 0 = 0 to the other tire,    and you sit there.

But the Truetrac is the diff that actually works with the e.brake trick.  Set the e.brake and it now takes more torque to spin the tire that's in the air.  That amount is multiplied by 3.5 and sent to the tire that's planted.  Of course 1x of that needs to go into slipping that brake, but you still get 2.5x trying to push you forward.

. . .