Jim, your post is a bit confusing. It says X360 in the title and X530 in the text of the post. Which one do you mean? I can tell you that the K58 tufftorq for the X360 and X340 are both serviceable. I believe the X320 and X324 are both serviceable too. Photos show a filler plug for both transmissions, but I don't believe they have filters. The X360 transmission pump has to do the additional work of power steering and deck lift, so it's transmission works a bit harder than the X32x, but it is strong enough to take the extra power of the X340's engine.