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Since this is an '03, it should be running a 4L60-E transmission. This transmission was fairly anemic as far as being able to stand up to an LS motor. If it has 240k miles on it, that is actually a huge amount of mileage for this transmission. As suggested, this transmission is due for an overhaul. I would bet the sun shell is worn out, as well as all the ...


Yes, an electronic issue would make it possible, but given the metal flakes in the transmission oil, it's almost certainly a mechanical issue. If the car has been driven particularly hard, and it's the original transmission with no upgrades, it is very likely that it just needs rebuilt at this point. The clutches inside the transmission do wear out over ...

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