My aw4 with the electronic shift mod (gear and tq lockout switches) will not hold any torque going down hill even in low gear locked in first. When in 2 high on the highway if I lock the torque converter in third it will actually hold restistance but this is the only gear and speed it ever holds on. Does anyone know whats going on with this stupid thing? I have a spare aw4 I could swap but it's 23 splined so then my tcase won't fit

 

This is probably a long shot but there is a switch on the brake pedal assembly that also controls TC lock up depending on if the brake pedal is pressed or not. It is a white plastic, plunger type switch with two wires going to it (I think the wires are black and blue). Take a look at this switch ans see if it could be the issue.

 

My TC is on my center console. I can lock it at any time. But in first you can't lock the TC anyway. It's like the tranny is in neutral going down hill. It sucks

 

Well it looks like I'm going to just 5 speed swap. Seems like the simplest fix now