So a few monthes ago I changed out my tranny fluid and used the Lucas Additive, which is great stuff. But recently I've been getting a grind going into 3rd. I've played around with it and it only happens if I quickly try to get it from 2nd to 3rd. If I shift into neutral for a few seconds then get into 3rd its not there at all. Anyone having or had issues like this? My clutch adjustment seems to be right so the only thing I can think of is maybe the syncho being blown or something to that effect? I don't know much about transmissions, lol.