After breaking four output yokes in a week I replaced them with Traxxas #5550 (IIRC) Traxxas Jato drive shafts. A cheap option, 1 minute customizing and I didn't break a driveshaft again.
Mugen MBX6Te RCM + Mugen MBX6e RCM + Savage Flux XL FLM + MERV all with Spectrum DX3S || WTS&WTB