brotherbill

I have an 87 pathfinder and at 55 mph my tach reads 3000rpm. Now i know this is to high on the rpm i'm not sure what the remedy is. It is an 87 LE with and v6 auto trans. It shows 1 2 and D on the selector on the console and there is no OD button or switch that i can find anywhere in the vehicle. I dont know if they where equipped with a lock up torque converter. Any ideas? Thanks, brotherbill