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 have just removed my 8 3/4 from my Los Angeles built 70 340 Cuda, and have started cleaning it. It only has a 3.91 tag on it. No sure grip tag, even though it definitely has a sure grip (Track Pak car). Rear appears to have never been apart. There is an orange paint daub on the filler nut, and a large amount of pink paint on the top of the pumpkin. Could the pink be the code for a sure grip?????
