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The most common reason for shudder is the binding in the central diff/transfer clutch. But it will only happen in turns. On straight lines all wheels rotate with the same speed and the transfer clutch does not do anything. This is assuming the wheels have the same diameter, of course.
Go ahead and put a fuse into FWD slot. Any fuse will do. This should disable the transfer clutch. Drive with it and see if the shudder is gone.
If it is gone in FWD mode, you will have pinpointed the problem to transfer clutch or it's solenoid.
Another possible reason for shudder would be bad driveshafts, don't know if it is possible to mismount driveshafts to cause shudder - never tried :-)
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