Their defense overall is currently 19th, with the pass defense dragging down this ranking a great deal.
The Jets are 30th against the pass. Only San Diego and Seattle are worse. This isn't only the fault of the defensive backs and linebackers in coverage. This also has to do with a pass rush that has been somewhat quiet over the last month. The pass rushers could come back to life this week against a 49er team that has given up the most sacks in the league.
On offense, the Jets best ranking is in rushing the football, where they are 8th overall. Their passing offense is 13th and their overall ranking is 11th.