Bought this truck used at 126k miles drove for a month started loosing coolant took it into my dealership they found out it was the water pump not the heads replaced for free I've had to do shocks ball joints tire rod ends maf sensor left bank exhaust manifold gasket evap control module u joint and axle shaft seals because I'm super picky but understand that I did not buy a brand new truck I bought used this truck pulls like a dream rides great just wish it didn't govern at 98 and had better stopping power I drove an 08 and decided I still liked the 04 better plenty of power and mpg isn't bad 04 sierra sle 5.3 extended cab 4x4 z71 is a keeper for sure out Mudd's my buddies fords and dodges
At about 53,900 miles, my 2004 5.3L developed a ticking noise.
Turned out to be cracked cylinder heads.
$3800 repair bill.
I had it repaired and traded it for a brand new Tundra with 5.7L engine.
Color - black.
If GM would have stood behind their product, I might have bought another one.
I drove this truck across the country, no problems and i had a trailer in pull. Maine to Washington. Very comfy and with a few add ons, the gas mileage for me is low 20's high way. 5.3L. Good truck, Recommend.
Bought used 117,000. Used a little oil and coolant would need irregular replenishing, odd. Every now and then a sticky lifter, then when I added Lucas to the oil all H--l broke loose, literally. Next oil change there was so much sludge in the sump the oil would not drained. Long story short, the sludge clogged the oil pump suction and w/o oil pressure things were not going to get any better. Found a used motor (100,000) miles, swapped out. Better engine, more power, no oil consumption, coolant OK. I'll probably drive this truck for another couple of years. I like it. I think the sludge was related to the coolant loss. As it was infiltrating the crank case and slowly evaporating out?
Ride, Power, XM, XM, XM. Goes great in deep snow.
Maybe the aluminum head iron block matchup was the problem.