You know, that T-case issue does not effect all trucks. I'm on my 2nd DMAX and I never had a problem with either of them. I wouldnt get all bent out of shape on that.
3rd generations put down the most power of all the generations, to include the 4th gen LMM's. Considering the LBZ's and LMM's are identical, the only difference being all the additional smog crap on the LMM's.
So far, I've heard about EGR failures but there are TSB's out for that. Intermediate steering shaft can cause problems but thats an easy fix and has plagued all the generations of these trucks. EGR valves are hit or miss. Easy fix for that is to block it, retune it and call it a day.
These generations will put down 300-330 h.p. and 550 tq to the wheels, bone stock.
Some of these trucks are getting good mileage and some dont. Evidently, no two are the same.
Look at the passenger side manifold to see if there's an EGT probe in there. Thats a sure sign that they had gauges or were running some kind of tune.
Check the transmission cooler lines. They are prone to leaking.
Good call. I forgot about that.