I have a 1987 F150 4x4 XLT, 351 with automatic. Yesterday, while driving downtown, the truck suddenly acted as though I was putting on the brakes. After pulling over and checking things out, I finally diagnosed that it was the transmission. Currently, I can shift from Park, through Reverse, Neutral and all the drive gears, and the transmission shifts right into gear. However, it only moves the truck properly in reverse and low. If I put the truck in Drive, it drives fine until it shifts into the second gear, where it starts dragging again. If I shift the truck in to low, it drives just fine. Fluid level is up, but the fluid is brown. No unusual smells coming out of the fill tube, or any smoke. Any ideas? I am hoping to avoid a transmission replacement if possible. Thanks Bruce in Seattle 87 F150 4x4 XLT