The rattle might be nothing more serious than a worn or bent shift fork. You should be able to see any serious issues without a teardown. Look to see if the gear lube has suspended filings. If it does, you have something serious going on. But you should feel the rattle through the shifter too. I have been inside of a number of different makes of transmissions, but not yours specifically, and if you do dive into either one or both, the things to invest in that usually do not get mentioned, is the usual expanding ring pliers, a sharpie and vaseline, and if you do not have a Polaroid or digital camera, get one. Take pictures of the unit internals with special attention to which way the shift forks are positioned as sometimes they only go in facing one direction and it is never marked. Do this before any dismantling of the transmission, and take pictures as you go along. Vaseline holds loose needle bearing in place very well and disolves in gear lube, and there will never be any significant gaps within the needle bearing when you reassemble- if there appears to be some room for almost one more needle or roller, there is room for one more needle or roller and it just needs some patience and persistence.
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