Since I am unable to find a 6 speed repair manual, I thought the next best thing would be a photo. On the left bottom is the drain/fill hole. Directly to the right you can see the reverse gear with it's shaft and what appears to be a hole through the shaft just behind the mounting boss. The bolt in question appears to penetrate this hole to stop the shaft from sliding out. Unfortunately I had a 5 speed only manual. My apologies and Sorry for the confusion.
