It depends on what kind of shake you mean. Sometimes with wider tires and less backspacing you will experience more feel in the steering wheel due to the scrub radius changing. This should be very small. If you experience considerable shake or death wobble you may have another issue with your lift. A couple of terms to search in the forums would be "steering geometry" and "death wobble". There are some good write ups and you may be able to determine what you are feeling. This will also give insight on how to correct it. In the meantime please describe the condition with more detail and we may be able to assist further.