Rear wheels slow to engage, need help!

[Joe 90]

Last spring, I ended a thread on this subject hoping that the tranny rebuild I was getting would cure the problem, but it didn't!!!

The story in short.....

When I floor it, the front wheels spin quite a bit before the rear wheels engage (with a big jerk).

The plan.....

So I have a new tranny in, (NIL FIX) and yesterday I changed the VSS that is mounted on the transfer case housing..... Guess what? STILL NIL FIX! The front wheels still spin when I floor it!

The tranny tech told me that "everything looks normal" in the tranfer case section" when he rebuilt it....

I need suggestions! Anybody had this problem before? How was it fixed?.... Next thing to change would be the duty solenoid or the TCU..?? (about the TCU, the diagnostic mode says "No Problem"!!!!)

Help me!!!!!

Thanks