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Motor pinion looks oke, found some plastic dust in the gearbox so my guess is, that it's worn out to the extent that it slips on the plastic cogs, I'll will buy a new one

Here you have, Even with a small obstacle in front of the wheels it just slips and make noise and doesn't go nowhere

I opened the truck and don't see visual damage not in the engine and not the pinion or cogs, keeps having the same problem little uphill and just sits there it doesn't climb it

The water and mud stayed under the frame of the truck so I think not to much damage there, but any way o was planning to but this of WPL https://www.wpl-rc.com/products/dual-speed-gearbox so the problem would be solved I guess with that.

I feel more it a transmission thing maybe rip some of the plastic cogwheels, tomorrow if I have time I take it apart

I don't think it's a bearing most likely the pinion, Yes that's exactly what they did :( . Just everything works still good it response well to the controller input, the only difference is that it's louder and when I put my foot down it used to be able to climb it, now it just stops and makes noise

Ok thanks I will try that, my kids are still very young but yes like that they would learn something:)

Hello, First time poster here so hello everyone. Like mentioned the problem is with the B36 wpl after a day with the kids driving in deep mud and very wet grass the truck doesn't feel the same,it makes more noise then normal and doesn't pull it's weight like before meaning it barely goes uphill...