TM 10-3930-669-34 2.  DRIVE AXLE NOISE GREATER UNDER POWER THAN DURING COAST (CONT.). KNOWN INFO Ring gear and pinion assembly OK. POSSIBLE PROBLEMS Planetary gears and/ or bearing faulty TEST OPTIONS Visual inspection. REASON FOR QUESTION If planetary gears for bearings are faulty drive axle will be nosier under power than during coasting. KNOWN INFO Ring gear and pinion assembly OK. Planetary gear and bearings OK. POSSIBLE PROBLEMS TEST OPTIONS Verify repair. REASON FOR QUESTION If drive axle is not noisier under power than during coasting, fault has been corrected. 2-78 (Para 10-2). (Para 10-2).