Interesting observation Russ...... I never did the math for 2nd gear.

I don’t know what the rear tire diameter is, but for 3.21’s, a 28” tire and 75mph I get 2889rpm in high gear with no converter slip.
Multiply by the 2nd gear ratio of 1.45 and I get 4189rpm....... plus you’d add in some converter slip(which should be minimal with a “2400” converter).

I kinda took it that he was letting off the throttle at 5500, and that was the end of the pull...... but we don’t see the big drop off after the throttle is closed on the sheet...... so, maybe it’s not where the pull ended but where the data acquisition stopped.

I wanna say....... it’s a rare thing for me to be able to look at a chassis dyno sheet and think to myself....”yup...... that all looks right”.