Originally Posted by
Roadknee
I ran the tank of 87 octane very low and topped it off with Chevron 92. I don't have any WOT knock retard in first or third gears now, but still have up to 5 degrees in second gear. I've read where a worn tranny can cause this. I'm running the original 4L60E with 160K. Here's a datalog if anyone cares to look.
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