New 4l80e stays in second
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New 4l80e stays in second
Just got the truck started for the first time with the new trans after having blown up the 4l60e and replaced it with a new Extreme Street 4l80e Coan trans and 3200 converter, with the Nelson Adaptor and a new tune to convert the compouter frm a 4l60e to the 4l80e.
No matter which forward gear I put the gear selector in, the trans starts in second gear and does not change gears. It stays in second.
I have no idea if it's the trans or the computer program. Any suggestions?
My trans guy is out of town until next week. I'm just trying to get some idea where to start in diagnosing the problem.
Thanks, Jim
No matter which forward gear I put the gear selector in, the trans starts in second gear and does not change gears. It stays in second.
I have no idea if it's the trans or the computer program. Any suggestions?
My trans guy is out of town until next week. I'm just trying to get some idea where to start in diagnosing the problem.
Thanks, Jim
Last edited by JimS; 08-06-2008 at 05:52 PM.
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If no voltage is supplied to the shift soleniods, the trans stays in second....
Check the pins in the adapter, I've had them push back into the housing insted of making contact when pluged in...
Check the pins in the adapter, I've had them push back into the housing insted of making contact when pluged in...
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If this is the case what is the next step? Does the adapter have to be replaced or can this condition be remedied?
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Thanks for your help!!
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It appears that the problem will soon be fixed.
The computer was throwing two codes just as soon as the truck was started, prior to moving the shift lever. Those codes were 740 and 785.
The 740 is the torque converter cluth enable selonoid circuit and the 785 is the 3 to 2 shift selonoid circut malfunction.
The computer was looking for these two items in the transmission and, I'm told, that while these items are present in the 4l60e they are not present in the 4l80e.
This means that there were segments of the 4l60e tune in the computer and this was causing the truck to run in the limp mode (thank you Vince).
A new computer is coming... overnight I hope.
I'll post up when it's running right. Thanks Jim
The computer was throwing two codes just as soon as the truck was started, prior to moving the shift lever. Those codes were 740 and 785.
The 740 is the torque converter cluth enable selonoid circuit and the 785 is the 3 to 2 shift selonoid circut malfunction.
The computer was looking for these two items in the transmission and, I'm told, that while these items are present in the 4l60e they are not present in the 4l80e.
This means that there were segments of the 4l60e tune in the computer and this was causing the truck to run in the limp mode (thank you Vince).
A new computer is coming... overnight I hope.
I'll post up when it's running right. Thanks Jim
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You have to use a Tune that already has the 4L80E in it.. and swap your Engine Segment over to it..
And if you really wanted to, you could remove the "Adapter" and swap the Brown and White wires on the Stock Harness. Then plug it back in.. VOLA...
But glad you have it figured out..
And if you really wanted to, you could remove the "Adapter" and swap the Brown and White wires on the Stock Harness. Then plug it back in.. VOLA...
But glad you have it figured out..