2004 Silverado 1500 Z71 transmission problems - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-14-2014, 07:27 PM   #1
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Default 2004 Silverado 1500 Z71 transmission problems

I did a transmission service (flush, gasket, filter) yesterday. We had some trouble getting the pan off because the exhaust crosses the truck directly under the pan, so we had to use a little more force than is usually necessary to pry it out. I also replaced the transfer case control module (with a refab, preprogrammed module) and did a transfer case flush. Now I have very little power in D. The truck doesn't move in Park and reverse works just fine. We're thinking either the shift linkage is loose or we busted a switch for the gears. Just wondering if anyone here has any other ideas.

Thanks in advance for the help
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Old 04-14-2014, 08:44 PM   #2
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Also, it drives fine in 2nd gear
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Old 04-14-2014, 08:49 PM   #3
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You might have nipped one of the shift solenoids. If its the 4L80-e, there is a solenoid right at the front of the valve body that practically hits the pan. I'd drop the pan and check for any damage.

I don't remember how the 4L80-E'* are programmed, but I believe your actually starting out in 2nd gear if you manually put it in 2nd.
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Old 04-14-2014, 09:59 PM   #4
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Quote:
Originally Posted by Mike1995 View Post
You might have nipped one of the shift solenoids. If its the 4L80-e, there is a solenoid right at the front of the valve body that practically hits the pan. I'd drop the pan and check for any damage.

I don't remember how the 4L80-E'* are programmed, but I believe your actually starting out in 2nd gear if you manually put it in 2nd.

I have the 4L60-E transmission, but it most definitely starts in 2nd when I do it manually. We were actually thinking it'* the solenoid. If it'* not the solenoid, any other ideas?
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Old 04-15-2014, 05:37 AM   #5
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No, no other ideas.
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Old 04-15-2014, 01:10 PM   #6
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No, no other ideas.

That'* cool. We got back up under there and the 1st to 2nd solenoid came out in 2 pieces. Replaced it and now the truck runs great. Thanks
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Old 04-15-2014, 03:57 PM   #7
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thanks for updating your fix
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