One problem related to clutch bell housing has been reported for the 2013 Ford Focus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Ford Focus based on all problems reported for the 2013 Focus.
Vehicle bucked or shuddered when starting from a complete stop or if coasting and then gas applied. Issue was said to be fixed at this time 4/30/14, which it did run better until it happened again on 9/6/14 when I pointed out the same issue. It was determined that there was a leak coming from the bell housing and it was dripping on the clutch causing the shuddering. On 9/16/14 it was taken to the garage for repair. I am still experiencing some shuddering, especially in reverse when going slow but also at times going forward. Not satisfied that it is completely fixed, but Ford has extended the warranty to 7 years/ 100,000 miles. I will be contacting the garage in the near future for them to look at it again.