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Discussion Starter · #1 ·
Stock 4.8 RCSB w/4l60e.
Has 180k on it. Truck used to be 'peppy'. It overheated several months ago pretty bad. I swapped out Tstat, waterpump, hoses, etc. Truck isnt overheating now, but just seems to have no oomph at all. I mean it was never a rocket ship, but I could roast the rear tires before. Now it cant hardly bark them at all.

I didnt see any oil in water or vice versa.
 

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How overheated did it get? Heads could be warped, even without a leaky gasket. Aluminum warps fairly easily and it doesn't take much to affect it. Rings could've gotten shot as well. Do a compression check / leak down test too. There's a number of things that could have been turned to scrap
 
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