The pinion I had on my original Slash 4x4 was literally fused on the motor shaft. I tried everything and finally I just had to get the Dremel out and cut away. It worked, but it wasn't very much fun.
I have had pinion gears stuck motors. I used a sledge hammer and a sturdy screwdriver to pry it off. I was able to reuse the pinion after I was done!
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Dissimilar metals corrode eachother which can cause fusion or welding of metal, in reality its just a pain in the rear end that ultimately will never end unless they cut the materials from the same cast
2.5r Pede, 2-speed O.S.21tm rusty , 3.3T-maxx