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I had thought of that - but my speedo accuracy is way off, so would kind of defeat the purpose. I was using the trap speed for my overall and TC slip calcs.
I was just trying to get a ballpark on the convertor slip @ highway speed as to whether it decreases to zero with minimal load or ±3% or is it the same as at trap speed.

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Get on the highway and use your watch and the mile
markers.... 60 seconds per mile is 60 mph then check
the rpm then do your calculations.... but under light
loads the stall goes way down(less torque), thats
why you can still use a high stall conv on the street