So I was driving my GT yesterday, and a couple of times it made a wierd grinding type noise that stopped after a second.. so I examine it after I finish that tank of fuel. Turns out that in the right axle assembly, the o-ring was gone from the stub axle and the one in the outdrive had worked about halfway out, so the dogbone slipping out of the stub axle and spinning. Seems strange, since the truck only has about 3/4 gallon through it. Is that something that just happens with dogbones?

Anyway, it made me consider upgrading to CVDs. So:
What advantages/disadvantages do CVDs have over dogbones?
How do they compare in terms of reliability (ie parts falling out like that..)?
In terms of life before needing maintenance/rebuilding?

Once I put my EPIC engine in my GT, mine got worse and worse... Eventually I got irritated enough to get the CVDs and haven't had any problems since then.

same thing happen to me, i just put a ball of tape where the o ring was, and it fixed it

Same thing happend to me.. head to your LHS and pick up a couple of spare O-rings that will fit.. just for the time being. I plan to upgrade to CVD's in the next month or so... after the holiday cheer of course.

if you have the o rings come out cut a small piece off fuel line and stick it in there. i have mip cvd on my rustler and have had them for a long time and ive only had the pin slip out so i grinded a flat spot in the pin so it wouldnt slide out and put heat shrink tubing over the pin as a boot, my cvd is also starting to oval out a little but where the cvd connects to the axle but its from over time and big .18 engine in there but i say there a good investment