I started my 1993 GMC 4x4, as i shifted out of park there was a clunk.
Then there was like a heavy roar as i drove, like i was in 1st gear. i pulled over and put it in park. i tried to shut engine off, but key would not turn off, i drove home, removed ground wire from battery and then popped coil wire off, key still locked in the on, can start truck but cant shut off. all shifting works fine. is there a relay,modole or something that may have blown? i did loose power windows for a few mins but they work fine now.