CEN GST converting w/center diff

[tashpop]

okay, i get my truck and started tearing down. i have run into a problem though i'm hoping somebody can answer some questions before i start buying non working parts.

i know a few people have used the matrix tr arena diff for this conversion. i was planing on trying with one i already have. i was at first going to just remove the front slider shaft and replace with a dog bone, only to discover that it is red lock tighted on and i cannot remove it and replace with an output cup. so then i try to swap the output on my diff with the output on the stock diff in the gst's trans. its made just a little different and the shaft going in is just short of allowing me to put the pin in it. now my diff is from a gs sut, but my question is will i be able to do this if i buy a cen diff from the arena? if not, my other option will be to tear into the front diff and replace its output with a cup so i can use a dogbone. i need to buy one or the other, but i really like the idea of keeping the slider if possible. my thoughts are less rotational mass, and a more solid connection than a dogbone.