Hey guys ! I have 2002 blazer 4.3 4x4. Clutch seems to grab fine when I drive. The problem is when I'm around 35 kmpH it doesn't want to shift in 2nd gear, Rpm go sky high and it only shifts when I let go of the gas. As soon as it shifts it seems to be fine on the highway. Could you please tell me what might be wrong with my blazer. Thanks Mike