Now a shudder?

I have a 99 Explorer XLT 4wd...
My bearings were shot in the front diff and I had to change it out.

This weekend, I replaced the front diff with a used one.
In fact, I found that the lower ball joint on the passenger side was bad also and replaced that as well.

I now seem to have a shudder.

To be specific as to what was apart...
I had the front diff, front CV axles and the wheels off.
I had to disc the tie rods and I disc the upper ball joints at the pinch bolt rather than take apart the A-frame.

Of course I had to disc the front driveshaft but I only disc it from the front diff.
I made sure to put everything back together and I am pretty sure everything is tight.

Now I seem to have a shudder. I have it as soon as I start to accel and I even have it when braking.
It is especially bad when making a hard turn.
Does anybody have an idea as to what I might have done wrong..or does this sound like something in particular is loose?

That Sounds Like A Worn Out Transfer Case