Nissan Largo Friends

Hey everyone, My boyfriend and I recently bought a 1994 Largo, runs on diesel, to travel around NZ.We have had it about a month with no problems except recently the gear stick has been getting stuck on us, the button does not want to click all the way in and get out of park! Any suggestions? or should we just take it to a mechanic?

The gear linkage needs adjusting, undo the the locking nuts on the gearbox lever put the gear selector in park and ensure the gearbox linkage lever is in park and tighten back up

Hutch