gmworldclasstech

So I was driving down the road when I noticed that I was in 2nd gear cruising 50mph. haven't seen 3rd or 4th since. No symptoms prior to the incident. Fluid level and condition on. No codes no cel. Pulled trans expecting to find burnt 3/4 pack and found plenty of clutch remaining. Found that the oil pump bushing had been worn away resulting in a severed lower nylon oring