Chassis dyno graph

If you had a 3500 stall, and had enough traction to be able to have the throttle wide open and the motor stabilized against the converter........ and did two pulls starting at different wheel speeds, it would change the shape of the curve.
A pull started off at 20mph or 60mph would yield different results, because even though both pulls were started with the motor loaded against the converter at 3500rpm....... the test starting at 20mph would have quite a bit more TQ multiplication at the beginning of the pull than the test started at 60mph, which would have hardly any TQ multiplication.

Chassis dyno results are much less “cut and dried” compared to engine dyno results imo.
The “car” adds a whole ‘nuther set of variables.