StarfireFan

I have a badly worn drivetrain yoke on my 1964 Starfire and can't seem to get the fluid leak around the yoke to stop. Two new gaskets have failed to do the job! I think the yoke has 28 splines, but don't wish to remove the driveshaft to find out. I am searching for a vendor to supply me with a new yoke. My model uses a Spicer style yoke and driveshaft. Thanks loads for any and all help!