2000 Shudders and vibrates only in reverse.

[bdpavlick]

My mother has a 2000 Sable with only 38,000 miles. When you back up it sometimes has a shudder and vibration. Worse when going up hill. It only does it in reverse and does not always do it. What should I look at first??

Thanks,

Bernie

[KimMG]

Check the engine and tranny mounts.