I cant remember exactly, but if it takes a while for it to engage in reverse, its a sign that the tranny is going out OR going bad reverse clutch
if you have no forward gears but have reverse then its B2 piston. 300K is a long time my tranny only lasted 260K. The home mechanic, well at least MOST home mechanics, all they can do is change the filter and the fluid and cross fingers.
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