OK, so what am I missing? I have a 96 Dakota 4x4 chassis (under my 49 Dodge truck body) with a 318 OD auto (I assume its a 518, factory stock 46000 mile drivetrain) with 3:55 rear gears and 235 75 15 tires. it is not a lightweight truck. According to the factory tach, the motor is turning right at 2,000 rpm at 70 mph on the interstate in Iowa. The truck pulls a pretty consistent 18 mpg at 70-75 mph, and is pretty fun around town.

If the stated 318 is doing 2000 at 60 with an od trans and 3:23 gears, something isn't working, like maybe the OD trans. 2,000 rpm is about what my truck is pulling at 60 before it shifts into OD. Gene