They are both significantly better than stock. You can't directly compare the materials, becuase they are completely different processes. 300m is a through-hardened material, where as the quadco xr is through hardened (softer) and then case hardened. I'd go for the nbt one just because of the rust preventative plating and the fact that they were developed by an actual 3S vendor (cheaper is just a bonus).
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Originally Posted by AlmosN8kd
I'm not sure if this is covered here within the thread (yeah, I know, shame on me for not reading everything but I have searched for this answer a bit and wasn't able to find what I'm looking for). Anyhow, I'm looking to get an upgraded output shaft since my tranny is apart for a rebuild and I'm looking at possibly getting the 300M one from Mark Williams or QuadcoXR one from North Bend Tech. My question is, which material is actually better? I've heard nothing but good things about the QuadcoXR and it is cheaper than the 300M shaft but I really just want the one that is of better quality and is stronger. So, can someone with experience shed some light on these two items for me as to which is truely the better choice?
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