GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

4l80e has no gears??

Old Nov 16, 2011 | 08:46 AM
  #21  
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Originally Posted by AKlowriderZ71
Is the truck a 4x4? I had a guy tow his truck 350 miles to me when his 80E had no gears forward or reverse. He had somehow bumped his t-case shifter into neutral. He was embarrassed when I showed him.
Yep, I've seen that too. But this one is a bit different as it was symptomatic very early after the rebuild and then it lost all movement.

g
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Old Nov 16, 2011 | 08:58 AM
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Its a 2wd. Ive been wanting to take off the pan but work has got me tied up.
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Old Nov 16, 2011 | 11:07 PM
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Ok i pulled the pan off. I couldnt see anything out of the ordinary. if someone could please tell me wat to look for that may be the problem. Thanks again for all the help.
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Old Nov 17, 2011 | 06:03 AM
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If you look at the picture below from the TG SK install directions you will see where the boost valve and the snap ring for it go. This is what I thought might be the problem. I would look for loose bolts on the valve body and also make sure that all the solenoids are in their bores. Also ones that are bolted to the valve body make sure that they are tight. There was a filter in this unit correct and did you take any pictures?

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Old Nov 17, 2011 | 07:28 AM
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I didnt get any pictures of it yet. The filter on it looked dirty and there was some stuff on the valve body and in the pan that looked like mud though.
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Old Nov 17, 2011 | 03:01 PM
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Not good. The mud you are seeing is from one of the clutch elements or maybe a band. It is possible that it is from the torque converter clutch as well.

Unfortunately, it is in need of being removed and disassembled for inspection and repair. Even if you are able to find an issue in the boost valve assy. as Vince is pointing you too, the damage is done.

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Old Nov 17, 2011 | 07:22 PM
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The boost valve seemed fine. I talked to my trans builder and he agreed to rebuild it at his cost if it was because of something he may have done wrong. All i have to pay is send in my converter to get cut and cleaned. Im also thinkin of restalling it lower. Anyone have wanna help me chose the right rpm for my setup?
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Old Dec 12, 2011 | 05:05 PM
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Finaly got a word back from my transmission builder. He said all the clutches were smoked. Got a new full billet converter on the way with a 34-3600 stall. lets see how long this one will hold
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Old Dec 12, 2011 | 06:36 PM
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And what did he say the cause of failure was?
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Old Dec 12, 2011 | 09:25 PM
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He says he wasnt sure why it went out. It may have been coverter failure that caused it. Maybe he can tell me more on it soon
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