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Leaking Driveshaft Yoke Yoke leaks such as imaged above are rarely the result of poor service methods. The o-ring simply loses elasticity over time with normal heat cycling.700R4 Won't Stop Leaking Different transmission, but the same principle.What is the color of the fluid droplet forming in this image - red transmission fluid or brown engine oil?
I can't see how that o-ring keeps oil out of the spline. It doesn't come in contact with the yoke, as it is constantly moving in and out of the tail stock. Is it sandwiched between the output shaft and the tail stock? I could see that as a possibility.