My 99 C70 convertible automatic is pulling to the right. It seems to start almost as soon as I press the gas or around 10mph. I have to hold steering wheel 15º-20º to keep it straight. Once I hit the brakes it straightens out and doesn't seem to pull again until pressing the gas again. Once it starts pulling the angle that I have to hold the wheel stays constant regardless of speed. Any ideas as to what could be causing this issue?

 

I put the car on a lift today and put the car in D and the RF wheel turned the LF wheel began to turn made some clunking noise, made some jerky movements, and then stopped. This also made the abs and trac control lights come on. Both lights went away after shutting the car off and starting it back up. I began to wonder if the diff is going bad, but I'm not hearing any noises when driving and while the car was on the lift the wheels spun in opposite directions when manually turned. If anyone could please give an opinion it would be greatly appreciated. Thanks.