[hawk25]

Try this..........

When you start the car and put it in R dont do it so quickly......if you do you will activate the 2nd reverse gear that will give you that rumble strip feeling or shudder....Wait till the car's RPM dies down then shift to R. Your car will be able to shift gears while not making complete stops try coasting in N for 1 second and then select drive...should work like a charm....