I re read and you are right. But it still holds true a Traction lock rear turns harder in neutral and easier with driveshaft disconnected.. 2. If you read the rtv specs each color tells you what they are designed for. As far as weight and quantity that is readily available info. Hear is a great source, the 68 Pontiac service manual on Harold B's site https://www.firebird400ho.com/mdocuments-library/ Then you can roughly buy the correct amount and fill to the check/fill hole. Before you pull the axle you can do a rough check on the condition of the locking cones and springs by grabbing hold of the axle face while someone is holding the other one and twist to see how easy the axles break apart. This is a subjective test because if you have two weak people it can change the outcome.