i have to add that my motor temps was about 92°C after 2 runs (IB3800 and GP3700), and that the track was improvised on sticky grass... too much for my front diff with the mulsher tires... i've not open my diff cases yet, but i don't want to buy another lightning diff if there is a better solution...

What's about the Genesis diffs??? do they fit the FLM hybrid box?