[piecesparts]

I have a 700 R4 tranny without a lockup converter. Yes , it does work that way. There is a slight loss without the lockup, because of the converter slip. The overdrive works well and I get a solid 15 MPG with the extra horsepower under the hood. I imagine that the lockup would give maybe another Mile per gallon. I, on the other hand, have a 2400 stall converter, due to the cam and the way the truck idles. The launch is fantastic and the shifts are hard and crisp. I also have a 91 Chevy Silverado short wide bed with a 5.7 litre, 700R4 tranny, 3.42 geared rearend (10 bolt). I average 17 to 18 MPG in everyday short trip driving and can get 20 MPG on the highway, if that is all I drive (Long Trips). It has a TBI injection and a lockup converter that is part of the reason it gets the better mileage. All of my trucks are running the same size tires and rims, so it is easy to deal with. Also my trucks have fully built 700 R4 trannys. That means the heavier duty clutches and five gear planetaries, along with the heavy duty seperator plates and throttle valves. Want great mileage ---Get out of the truck and buy a mini cooper.