Went to back out of the garage today and discovered no reverse gear on my TKO-500. Appears 5th is also out. Seemed to have come out of nowhere, but then I recalled my latest drive this past weekend when I missed a shift between 3rd and 4th under heavy throttle and nicked reverse. Got the grind you'd expect, but it notched it into 4th no problem. The shift lever moves into the reverse position, but it isn't the typical notchy feeling I get in the other gears. I also can't get the shifter to lock into the 5th gear position. I haven't started any diagnosis, but thought I'd ask for suggestions from the experts to help me narrow it down more quickly. Hoping to diagnose and repair myself, but transmissions are a weak spot for me experience-wise. Good news is I have a reliable transmission shop nearby that I'm confident could handle the job if it comes to that.