Well, I am putting together my Kyosho diffs. The rear diff pinion on the trinity has a sleve on it that goes into the case bearing. The Kyosho spur gear has no sleeve, a stub connects to the gear and that goes into the bearing and exist the housing. Then on the kyosho you put a cup on that and it takes a dogbone. The shaft on the trinity will screw into the kyosho diff spur but it is way too small to fill the bearing.
Here is a comparrison between the 2. The one on top is the Trinity.
Here is what the assembly looks like when the kyosho diff spur is on the trinity shaft. There is nothing for the bearing to ride on.
How have people gotten around this? Did I miss it in the previous posts?