I posted this a few months ago. If you have the o-ring fitted in the diff outdrives take it out. It's only there because the gear diff is normally fitted in the RTR version with dog bone driveshafts so the o-ring stops the shaft chattering. As the CVD shaft is firmly fixed at the wheel end the o-ring has no function and just gets in the way by stopping the plunge on the driveshaft thus limiting the suspension from swinging through its operating arc.
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