I was shifting at 5600-5700 trap at 57-5800. It looks like the converter is slipping about 12% also. I definitely have a lot of work to do on this thing.
You should use a seamstress tape to measure the tires actual circumference in the middle of the tread pattern and use that for your converter slippage calculations, not all tire heights are the same as advertised
I learned that lesson a long time ago when I bought a pair of drag slicks that had over three inches difference in circumference between the two tires
The stupid car started driving sideway away from the starting line at WOT
It didn't do it with the other tires so I finally figured out it was in the new tires, nothing else
I've bought and used 9x30x15 inch drag slicks that varied in circumference from 92.5 inch to 96.75
Once I found out that I could get and legally use the taller tires those were the ones I bought and used from then on
