Quote: Prior to 1969 most Spicer Power-lock equipped passenger car 8 3/4" rears used a round, aluminum sure-grip tag.
Starting in 1969, with the introduction of the Borg Warner Spin resistant differential, the limited slip lube requirement was supposed to be designated with a dalb of paint. Unfortunatley, I can't remember the placement or color.
I cannot thank you enough for passing along this information. The rear end colors and logistics still are a mystery for now. We have already "fixed" the error and left the colors just as we found them. I originally thought that the tag might have been removed sometime in the past 38 years. I am beginning to believe that the blue marking I found on the casting might be the color that designated the limited slip setup.
