I've just completed another 15,000km journey around southern Africa in my HZJ79R 2013 (82,000km) and the R151 manual transmission has developed a few noises. The first I noticed was a rattle at the base of the gear shift lever, particularly cruising in 5th gear. This stops if you hold the gear lever further to the top right. Now there is also a drive train whine when in 5th gear and to a lesser degree in 3rd gear. Checked oil level and was full and clear, but not yet replaced. Any suggestions?