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Joined to post what i know about the manual noise. Sorry for the necro post. I have a 2014 D-Max and the noise started while still under warranty ~100k mostly highway driving. Local Isuzu dealer refused to look at it but hinted at knowing what the issue was, "oh its ok, don't worry". About six months out of warranty it got worse, and after another 12 months i had it pulled out after trying oil changes etc. The gearbox specialist i used thought it was the 5th gear issue as noted elsewhere. Checked it all and then replaced the syncros. After a week the noise started again, gearbox specialist wanted to wait until it was really bad before pulling it apart again. Still have it as my second work ute, and was informed this week that it is getting bad, have to go quickly into third from second to avoid the noise. It sometimes used to also happen when dropping out of gear and rolling to a stop. What i am lead to believe as he has fixed another one since mine is that there is a press fit bearing on the font housing, which is firm when cold, but when heats up spins, leading to the noise. This is why it slowly gets worse, yet when pulled apart it looks "ok". We will be pulling the gearbox out again soon, so i will post an update.
To be honest Isuzu shafted me a few times on warranty while I had the D-Max as my primary vehicle. Things like paint issues were refused because of "timing", even though a friend of mine who works in the industry agreed it was a manufacturing issue. But why i won't buy another D-Max and avoided them for my new ute is the gearbox issue, the local dearly clearly knew what the issue was and refused to do anything about it. Which is a pity as I really couldn't fault the vehicle apart from that.
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