[bllwnkl]

Originally Posted by J-Mech

Thought about it today, and thought, you know, I don't remember feeling the converter clutch kick in. Seems the truck is awfully loud too, like it's running faster than normal. I bet the converter isn't locking up. Now, on basically all vehicles, the brake switch is a multi function switch. I doesn't just turn on your brake lights. It has more functions. One of which is to signal that the brakes are applied so that the PCM knows to unlock the converter clutch (cc for short). Hooked up the scanner, and sure enough, the brake switch showed the pedal was pushed on the scanner. It's a separate part of the switch, so the brake lights work fine. Changed out the $15 switch, and now the cc locks as it should.

At least it wasn't you. My '91 C1500 was doing that, too... I was driving around in Drive. DUH!