tcu to duty solenoid mod?

[patb3]

Hello,

I read a FAQ that SoCal-LS-L made (it was in his signature) about a tcu to duty solenoid mod. I tried searching for more info on it here but couldn't find any. Hoping someone knows more about this. Here is the excerpt from the FAQ:

"For firmer shifts, you could also do the same thing from the TCU to 'duty control solenoid' A to remove the signal. This would force full line pressure into up shifts. For 4-wheel drive 'lockup', you can disable (switch off) duty solenoid 'C', this will lock the car in 4 WD (50/50). You could probably wire all of these circuits into a single switch (say under the accelerator pedal, or tied to the 'Manual switch"). This would be great for racing."

I am mostly interested in this for manually setting the diff to 50/50 (I live in Maine with bunches of snow). Thanks!