DEX408 greasing and servicing

[Andrius]

hello folks. I recently purchased dex408 kit. Didnt find any gear grease in the kit, however got some greases from hpi short course truck. I using HPI molybdenum grease on driveshafts and gears while asembling, however gear box a bit noisy. Diffs is ok. Noise comes from 2metal gears in the gear box. Might its the way how it is when new or just wrong grease? And i find a bit free play in the mid driveshaft housing and when driveshaft pushes in it makes noise even worse. Im sure snapring is in the place. By the way i wondering how to take out that snapring when needs servicing? Might put some shims there? Never had 1/8 buggy before. I also have HPI heavy duty grease (that one is green). Might i suppose use that one instead molybdenum?
much appreciated for advises.