Same here, even with Savox I had to wiggle, tap and wiggle tap to get it in. But after that its awsome.

The only think I broke after direct frontal impact was the hinge pin brace "A" block and the GearBox. Also Plastic insert on the "B" block ripped off.
I would get extra front and rear gearboxes, and maybe the "A" Hinge pin brace.

I also put M2C quick change motor mount, optional wheel hubs and closed caps, aluminum center drive shafts, Ifmar tank, Revised front bumper, and Sumo skid plates.