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4L80E Not Pumping Fluid

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Old Jan 16, 2023 | 04:58 PM
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Default 4L80E Not Pumping Fluid

In a 1992 Chevy 2500. I pulled out the original 6.5 diesel and swapped in a 4.8 motor. The transmission worked fine before the swap. I used a transgo HD2 kit and put in the updated force motor with vent hole, and an updated wire harness. I also swapped in a new gas torque converter and put a flex plate with a spacer. I installed the torque converter dry. I added one gallon of fluid through the dipstick tube before starting the motor It went forward fine. In reverse it would not move until I revved the motor significantly. I only ran it for about one minute and shut it off. I added another gallon and restarted it. Now it will not move forward or reverse at all. The fluid level in the case is very high and will come out of the vent hole if I add any more. The level is not going down. I disconnected the fluid line to the cooler and verified that it is not pumping fluid at all when running. Any suggestions?
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Old Jan 17, 2023 | 12:43 AM
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Check the converter is seated into the pump all the way.
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Old Jan 17, 2023 | 10:21 AM
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I'm pretty certain it is seated all the way because I knew to watch out for that.. I'll double check though.. This is the exact flex plate I used, with the included spacer.:https://www.summitracing.com/parts/a...AaAsLIEALw_wcB
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Old Jan 17, 2023 | 06:20 PM
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The Transmission can not operate with zero Fluid being pumped...

Anyone want to post an Image of what the issue probably is?
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Old Jan 18, 2023 | 01:37 AM
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Originally Posted by vorteciroc
The Transmission can not operate with zero Fluid being pumped...

Anyone want to post an Image of what the issue probably is?

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Old Jan 18, 2023 | 07:09 AM
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Well that's nice that some people get to have a laugh at my transmission not working.
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Old Jan 18, 2023 | 08:02 AM
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I can guarantee a 4l80e will not look anything like that photo
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Old Jan 18, 2023 | 03:01 PM
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Your problem is most likely the torque converter is not far enough into the pump or the pump gear is broken.
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Old Jan 18, 2023 | 03:37 PM
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Or more than likely the Rear Pump Half is Grooved between Suction and Output...

Usually deeper than this:



Attached Thumbnails 4L80E Not Pumping Fluid-320419d1318208943-4l80e-no-movement-no-line-pressure-ideas-4l80_pump.jpg  
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Old Jan 22, 2023 | 06:25 PM
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I appreciate the help.

​​​​​​The torque converter is seated all the way in. I just double checked.

I'm back to 6 days a week at work now and running short on free time. Does anyone have a shop that they can recommend in the San Francisco east bay area?
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Old Jan 23, 2023 | 07:37 PM
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I dont but hey Union City represent! Go Bernard-White Broncos!
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