There is one poster on here that had problems with the Royal Purple Synchormax in his ZL1 1LE, but I put it in my regular ZL1 and love it. Shifts so much smoother than before.
As far as diff fluid, since I am still within my warranty, I put the factory recommended AC Delco fluid in. Seems to work just fine.
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People are a lot like slinky's: not very helpful most of the time, but they bring a smile to your face when pushed down the stairs...
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