Dex410 Noisy when pulling away

[neilma1]

Hi Folks,

I picked up a new Durango DEX410RV3 this week and have just finished building it tonight (put a Turnigy 80A Trackstar Waterproof ESC in with a Turnigy Trackstar 5200Kv motor (21 Pinion gear)

All seems fine except for initial pulling away - I get this rapid knocking sound (something like a jackhammer (but 1/10 scale ) for the first meter or so, then its fine. If the car is rolling and you accelerate, you don't hear the sound. If I pick the car up and accelerate hard, no sound. Its only when its on the ground.

I thought it could be the slipper clutch however the only video I can find on youtube that has the sound on it, makes more of a whoosh sound when it slips.

The motor looks meshed against the spur gear (and not slipping) so I am at a loss what it could be.

I have found that I have installed my diffs upside down in the car, but I don't suppose that makes that much difference but will swap them back tomorrow morning.

Any ideas?

Thanks!