> Are some of you using synthetic gear oil in your TR3 differentials? I have been using exclusively Valvoline SynPower (full synthetic GL5) gear oil in all my Triumph diffs for many years. Never any issues, and in fact I credit it for making the axle in my TR3A (which was already well worn when I got the car) last for the 150,000+ hard miles that I drove it. -- Randall