I've read in other forums that the stock steering servo has failed on others pretty fast. A few have also indicated they have broken some arms. Don't know if those are user errors or a indication of what I can expect. Haven't read much about the shafts breaking or the diffs giving out. I ordered some extra arms and spur gears to start the spare parts bin. The rear tie rods on it look pretty stout.
The bearings that hold the center differential in it bulk are a 12x18x4 bearing which figures. Kyosho always seems to just a little different somewhere. I had the RCM Kyosho motor mount from the STRR conversion and was going to use that. Well the bearings are too big. I tried the sandwich trick but it will put the motor too far back from the spur. The pinion will be on the very end of the shaft. So that's were I am at now. I am working up a custom mount using Mikes motor mount as a template more or less. Pretty hard to come up with any improvements over his design.
Here is the photo bucket link if you want more.
http://s212.photobucket.com/albums/c...DST/?start=all
I will have to post a pic of the way the center differential is setup with a top that seal the differential, then the spur (with a hole in the middle) screws into the diffential. You've probably seen what I am talking about.