While driving my vehicle, the vehicle suddenly stopped accelerating. I pulled over and when I put it into park it felt like it was the transmission. However, I had the transmission inspected and there were no issues. Prior to the happening the ‘service 4WD’ light kept coming on. After the incident, the vehicle could not be driven over 45mph, the steering was so stiff I could hardly turn it, and every time I put the vehicle into drive or park it would feel like the transmission was about to drop.