T-134 Transfer Case Operation

[Dirtydeedsmx]

Would someone please tell me how the front differential operation is DESIGNED to work. I hear so many versions. All I know is that poppet valves are sending air to the brand new actuator , but no front wheel pull. Removed drive shaft and confirmed free spin in forward and reverse. I suspect the sprague unit, but don’t want to repair a unit that is just gonna go out if I accidentally roll backwards in forward gears. So I’ve heard on other forums.

 

[Scar59]

The rear wheels need to slip/spin (loss traction) before the sprag engages. Have you tried to get the rear to slip? See 98G's post in the 5 ton forum from yesterday, he tested his in some soft soil/grass. I tested mine by chaining the truck to a very big tree and got the rears spinning and yep, the fronts started digging in the grass.