I am in the process of pulling my powertrain and driveline out to do some refreshing and check a leak on the back side of of the engine. I have a set of 3.90 Richmond gears and bearing rebuild kit that I was going to do at the same time while I have everything apart. I have never cracked open the differential on the car and am somewhat scared to see what the fluid looks like in there. I drove the car most of the summer with no whines, slips, or mishaps from the rear just wanting to do some maintenance while I have the cover off and installing new ring and pinion. I am contemplating the Trutrac diff and wondering if it is worth the investment or should I just stick with the stock diff? I don't plan to track the car, maybe once or twice to see what it will do, but it will mostly be a dedicated nice weather cruiser. Any experience or opinions on the trutrac is welcome.