I have a Chevy Silverado 1500 with a 4L60E tranny, I was going down the road running fine, and all the sudden 3rd and overdrive went out. Took it and had it put on computer and no readings came up. I have changed fluid and filter, maf, vss, and check all shift selinoids, I'm thinking it's my govener, because I rebuild transmissions and my tranny looks good, it has the normal shavings in it, This one has got me stumped what could this be. thanks Martin