The 4th core plug is at the rear of the engine block, it's an engine out job to access it as it is hidden behind the flywheel.
![[Linked Image]](https://www.tm-img.com/images/2019/06/30/fullsizeoutput_c1a.jpg)
The gear lever can be accessed from within the car, on mine I was able to change it without removing the tunnel just by working through the hole in the top.