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That definitely has something to do with it. Here is a graph of Auto vs Manual gear ratios:If the gear the auto was dyno'd in isnt 1:1, it will also produce a lower measured number. I do not think you can get the gear 1:1 with this auto.
If you notice the Auto doesn't have a 1:1 ratio. We had to dyno ours in 3rd because it would hit the speed limiter in 4th gear (146 mph I believe).