TC slip?

If a TC has 8% slip @ the stripe at 6500rpm what % slip might it have @ 3500rpm on the highway?

Nobody will be able to give you the answer,but you can run a simple test.

and that would be?

Drive down the road @3500rpm,note your engine rpms and MPH. Enter the data(include tire diameter and gearing info) into your calculator to get the converter slip #'s. Use a very flat road surface and windy days aren't the best if you want to be accurate.

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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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