Motor Has power. Nothing else does
 

Hi everyone. Here is my problem with my 2000 Chevy Blazer Has lots of power from engine. Going up hills does not hold speed and slows down. Engine will rev to almost red line to gain speed. I know my transmission does not slip at all. Here is another thing that i have Noticed. I went to tow a car out of a driveway because it was stuck. well i ended up locking it in 4X4 thinking i had the power to pull him out well i didn't even have power to spin the tires. All it did was sit there i had it to the floor didn't do anything. I immediately Stopped thinking i was going to blow a transmission line for something I am not sure if it's a kick down issue or what.