I am working on a 1999 Freelander 1 L-series diesel with the 5 speed PG1 gearbox and 290,000km (180,000 miles) on the clock. On over run it drops out of 5th, but will stay in with light pressure on the gear stick. It is also extremely reluctant to go into 4th above 40KPH (25MPH) even if you try...