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I was told by SMR transmission that they are seeing up to a second and a half when changing from the A518 to the 727. The guy I talked to said it was because of the extra weight and the extra drag from the overdrive.
That statement right there would cause me to stay far away from that vendor. IF there was that much drag in OD, how would you ever get decent gas mileage out of one? It takes a TON of drag to slow a car down a full second. 
yeah, my BS meter is going off on that statement, BUT, there's no qualifications....I COULD MAYBE see that much improvement if it is a bone stock 518 w/stock converter, with a stock governor that probably forces it to shift ~4500 RPM, vs. a fully rollerized, aluminum drum, (maybe 904 internals) 727 with a good 9" converter....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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