I got a 95' Silverado 4x4 with the 350, 4L60E tranny. It just turned over 120,000 and everything satisfies me except when the tranny goes and shifts into OD. When it shifts into OD and you give it some gas it makes a noise from the tranny im pretty sure. A friend said its just bogging the engine down. I had a 90' that did the same thing. What is it??? Is there something wrong?