Originally Posted by bob8040
I'm running a tranny cooler as I was told a few years back when we got the truck that the tranny in these trucks need to be looked after. My issue is wondering if upgrading to a 5.9 is a good move. Is their reputation as good as the 5.2, which has always acted bulletproof in my experience. Just looking for a bit more towing power. Thanks for the comment, though. Just looking for feedback as I know nothing about the 5.9.
I would say the 5.9 is just as reliable as the 5.2. On my '97 w/5.9, I had a water pump gasket go at 380,000km, while they fixed that I had them replace the timing chain and gears. That's the only thing that was touched on the motor by the time I sold it with 450,000km. It saw 90% highway miles, and only ever pulled a small trailer though.