My week long experience with a Gear Vendors on a 727 with a stockish 440 was that it was not enough overdrive to warrant the expense and the gear splitting was slower than leaving it alone and shifting it into the overdrive in 3rd.
What rear gear were you running and what tire height? I'm at 2650 RPM's at 60 MPH on the highway in my Duster with 3.55's and a 27" tire, I know darn well an overdrive button would make me much happier at around 2100 RPM's.
