Hey Scotty, I have an Infiniti M35x 2006 with 70,000 miles. When the engine is cold and I shift into reverse, the car gives a strong bump/Shake. Once the engine warms up, it shifts smoothly. I just had the transmission fluid changed. What do you think the issue can be?

check for broken motor mounts and drive shaft joints first, and PRAY it's not reverse gear going out, those have weak trannys

Thanks. Can I just leave it as is, or is it a must to have it checked out?