While turning a corner today, I heard popping noise, then the car slowed and would only move about 2-3 mph. This continued for about 1/2 mile until I could turn into a parking lot, and the car completely stopped. Engine runs fine, just won't move. I've had no transmission slippage or odd noise....this just happened out of the blue. I had it towed home, and upon jacking up the front end it appears the axles are in tact. When I spin one side with my hand the other side will spin as well. When starting the car with wheels elevated, and put in the gear the front wheels will spin in forward direction, but will not spin at all in reverse. When put on the ground, still car will not move, even tho wheels spin while elevated. I'm assuming something broke in the transmisison...BUT could it be something else (CV Joints/ Torque Conv./Planetary Gears/Diff.) that I should check? This transmission has about 175k on it since it a rebuild about a dozen years ago (I've gotten use out of it).