07 Chevy 2500HD ~300k opinions

The truck looks great!

Just a thought, but could the hydroboost be leaking into the interior of the truck? Just a drop or two of fluid could make it smell.
Smells outside more than in, could be leaking buy not making it inside. That might be a fall project!
The truck cleaned up nicely.

Does it still have all of the exhaust manifold bolts?
Guessing by what I heard today negative! Might get the dorman clamps like I did for the other.

This truck is 50/50 on if it was maintained good. Took over 10 pumps or more and water came out of a couple. On ball joint wouldn’t take anything, managed to drill/clean it out and finally did. Only one ujoint had a zerk, the other two didn’t look old. This and Express has the same amount of zerks, my least favorite job times two now.
 
New steering bearing worked awesome.. no annoying constant rattle and no wandering. Might not need a steering box. Someday will get the $100 metal version. Also new fan clutch worked. Too quiet now 😂 can hear the tires. Has Goodyear Wranglers which isn’t old but one has dry rot, the others look ok. Walmart’s Dexetros might be in its future.

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What's up with that sidewall? Maybe a belt twisted or something? The cracking wouldn't make me nervous, but the sidewall shift does. Good idea on the new tires.

A few posts up you mentioned the mileage. 12-13 seems pretty normal for these trucks unloaded. My 2012 with 3.73 gears would only break 13 mpg on easy country roads, unloaded, cruising at 50ish in mild spring or fall weather. Any change to that exact condition would drop the mileage.
 
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