I'm in your thread now. Did you have the center piece of the cd mount upside down? The flat part goes down...
Are you running traxxas diffs in the front and rear end? That would mean you can only really use dog bones, most center cvd's are for an 8mm pinion shaft.
I'll take a look at both my center diff maxxes and report back what I used.
Edit- this maxx>
http://rc-monster.com/forum/showthre...&highlight=pif uses an LST center cvd in front, and a ofna hyper 8.5 rear dog bone in back.
My cybermaxx uses the FLM rear dog bone that came with the FLM chassis in the rear, and I believe a savage front dog bone up front.
Also like neil said, mod1 46 tooth spurs are a better fit and require minimum trimming of the chassis. In my cybermaxx I was able to trim in between mount holes, so I could still mount a transmission if I ever wanted to.
Are you using the 3906 or 3905 FLM chassis?