If you haven't done so already, patrol4x4.com.au - a plethora of information.
I think the utes only came in 4.2TD...? (unsure). If it's a 3L from 2000 - 2005, walk away.
If it's been used as a tow vehicle, it's a gamble, if the owner/s shifted into 5th too early and labored the vehicle. There is a few other bits and pieces to spot too.
Brent.