How to tell when it's time for new driveshafts

[Overdriven]

I had a VXL rusty running on 8 cell NiMh with stock gearing. After a summer of use the metal pins of the universal joints elongated the holes of the all the plastic parts they sit in. And from what I've been told a popular upgrade for the vxl rusty is the jato shafts and metal tranny output yokes. Wish I had pics to show how bad it was, but I'd say I could probably get another season out of them before having to worry about breakage.