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05-22-2023 #1
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- Feb 2012
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- 64
4L65E Only works when cold 200-300'
Short Question: What would cause a 4L65e to only work for a few hundred feet before giving out, not throwing any codes
Longer Story: I’m starting a new project which has the foundation of a 2001 Yukon Denali. I bought the Yukon cheap because the transmission doesn’t work. Well I go pick it up and drive it right onto the trailer, yay! Except when I’m pulling it off the trailer, I get about 120’ and the trans stops working. Come back a couple days later and move the truck maybe another 200-300’ and before giving up, again the next day. Anyway I bought the truck with the intention of buying a junkyard 4L65e and swapping it but I’m starting to think if I can just fix the one that’s in it I would rather go that route since I’m having a hard time finding anything but a 4L60e. The guy I bought it from tells me it’s the second transmission this has had in it and it was replaced roughly 40k miles ago. They tried putting a new trans cooler in it thinking that was the issue but that didn’t fix the problem. The trans is full of fluid, that’s the first thing I checked. I’m wondering what could cause it to only want to move when it’s cold? I’ve tried running the trans through the gears and they’re all neutral after a few hundred feet.
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05-22-2023 #2
Registered User
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- Jul 2008
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- 454
Possibly the trans filter seal? When the trans stops working, check the fluid and look to see if the fluid has any bubbles on the dipstick?
*Jeff*
Project Salty - 1964 4 door Malibu, beaten, neglected, red headed foster child
Cammed LQ4 / T56 Swap Project Thread <-click to read! 😁
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05-22-2023 #3
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- Feb 2012
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- 64
I'm in the middle of stripping the Yukon right now but I hadn't thought about that, once it's stripped and just a carcass I should be able to run it around the field to test it. Thanks!
Originally Posted by Hotwire
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05-23-2023 #4
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- Dec 2022
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- 2
Since you say the trans is full of fluid while in park with the engine at idle ? .... You describe a situation where the trans filter is clogging up. As the trans sits for a day or so the converter drains back, flushes the filter out a bit. Start the vehicle up and it will move for a short distance till the filter clogs again.
With the pan off , I would check the filter for a cracked plastic tube that slides into the pump. If that is OK, break the filter open to look inside for debris in the filter material
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