1993 Plymouth Voyager Shudder at stops

Hi, I just got a 93 plymouth Grand-voyager up and running. The only remaining problem remaining is a shudder as I approach stops from speeds above 15 mph. Upon reaching apox 5mph (right about when the downshift from 2nd to 1st should occur) the vehicle experiences a shudder, a sudden lurch forward and a slight bogging of the engine, and then it completes the stop.

So far I have done the following to narrow it down:
1) it is less severe or even unnoticeable if breaking hard or extremely softly, though this has been claimed to be the problem being intermittent.

2) I have stopped while in neutral to rule out the tranny, it dosn't studder in neutral but it does make a thunk which sounds internal to the engine compartment.

I am trying to track down the location of the ABS and disable it temporarily. Supposedly there is a fuse which I can accomplish this by but haven't found it yet (assuming the van has ABS as there is no ABS light upon ignition as the repair manual suggests there should be)