Andrew_S
Observer
Seems perfectly fine to me. 226,000km = 135,000 miles. My '04 Suburban had 136,000 on it when I bought it in 2015.
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There are two reasons you don't see too many GMT-900 builds on ExPo: The first is that there is a general preference by many users for SUVs and particularly the likes of Toyota, Land Rover and Nissan. Second, not too many people want to start building up a vehicle that is brand new, so vehicles have to move "down market" a bit (i.e. they have to get older and cheaper) before people are willing to start swapping parts and bashing them up in the wild.
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It's funny that you mention this now because I have been casually shopping around for a 2009+ Chevy/GMC 1500 crew cab 4x4 to replace my '04 Suburban, when it needs replacing (which will likely be next year.) They have moved into that part of the market where they're very affordable. 2009+ gets you the 6 speed transmission which should (theoretically, anyway) give better MPG. Also by 2009 AFAIK most of the AFM issues (that plagued the 2007 - 2008 models) had been worked out. The rest of the drivetrain should be rock solid. A topper should get you enough room to sleep in the bed (if you sleep diagonally!) and after that all you need is good tires and camping gear.
Wouldn't expect this out of any of the 5.3's. Unless you shut the afm off entirely it's always an issue from my experience. Had a 2012 and by 50,000 km's it was burning 2 quarts of oil every 5000 km's. I've read hundreds of forum posts regarding the same issues. Although they did make some "fixes" lots of guys were still having issues afterwards with later years.