Update, 3.54 gears are doing fine. Just floats along with very little pedal effort at 50-60 and mph is dead on. Used the state police mile lay off signs on the highway, cruise set at 60, I went 59.96 seconds so that's real close. Filled up today so in about 100 miles I'll check millage, feels like it will be better than 13.5 mpg, hope, hope. Van just feels all around much better, didn't lose any power that I could tell.