I have a 04 gmc sierra 1500 4x4 extended cab truck, 5.3 L engine. And it won't shift into 3rd / overdrive. Previous owner had it fixed but it's acting up again. No check engine light.. Ideas?
Is it low on transmission fluid? If not its probably a bad transmission. You could have it flushed but I would take it to a REPUTABLE mechanic.
Thanks I'll try that!
Y is my 04 GMC Sierra 4x4 saying reduced engine power and bearly go when just I put it to the floor?
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