Service on the J and Z lines will be shut down completely in part of Queens starting July 1 as workers start the final phase of a track replacement project, the MTA said Friday.

According to the MTA, J trains will operate only between 121 Street in Queens and Broad Street in Manhattan. There will be no J or Z line service from Sutphin Blvd-Archer Av-JFK Airport and Jamaica Center-Parsons/Archer.

In addition, J and Z line skip-stop service, in which J trains skip some stops and Z trains skip others, will be halted, and Z trains will operate as J trains and make all stops between 121 St and Myrtle Av.

The MTA said the last step of the project includes replacing approximately 2.4 miles of tracks on both the J and Z lines.

Earlier in 2020, the MTA completed the first part of the project by replacing 6,300 feet of track on the E line over a 10-week span. The agency says the new replacement plan will cover twice the distance in the same span of time.

“Track replacement work in this area of Queens will bring us closer to our goal – delivering New Yorkers the modern subway system that they deserve,” said MTA Chair and CEO Janno Lieber. “We appreciate our customers’ patience as we make the upgrades necessary to improve the reliability and speed of service.”