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Old 07-20-2005, 03:48 PM
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2000 GMC shifts rough

I own a 2000 GMC Sierra 5.3 with an Automatic. The truck runs fine and has plenty of power but seems to shift kind of late and rough out of first gear. If I give it alot of gas off the line then let up after it shifts into second gear, it will take a while to up**** into third. It also started out in second gear once when I was at a stop light, but then quickly downshifted back into first with a little more gas applied.

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Old 08-16-2005, 11:52 AM
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I'll bet it only does it with the transmission hot too, like after a 100 mile drive or so.

The 97 - 2001 TH 700 (The 4L60E in your truck is based on the 700) auto's had a little defect in the valve body The valve body is aluminum. Over time the TCC valve operation wears the valve body and causes an internal leak. Now the 4L60E being computer controled senses the leak and raises line pressure to compensate (That's the hard 1-2 shift). If the problem occurs on 2 or more consecutive driving cycles it will activate the MIL and set a code.

There's a revised valve body to correct the problem (don't have the part number). You could also have a steel sleve pressed into the existing valve body. Unfortunatly if it's gone so far as to start the hard shifting the tranny's probably toast and will need to be rebuilt.

How do I know this, the 99 silverado sitting in the driveway.
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