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Was the car in 4th gear?

Presuming that the auto's 4th gear is the 1:1 ratio in the auto transmission and that the diff ratio is the same as the manual car's 3.5:1, then I think you were really doing about 5805 RPM. That doesn't sound right so maybe the diff ratio in the auto is 3.7:1, in which case it works out to 6136 RPM. Sounds a bit more like it!
 
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