dylanT Posted June 28, 2014 Report Share Posted June 28, 2014 I recently did a 2wd 4l80e conversion and just now got it all installed and running, I used the spear tech working harness and speed sensor, trans isn't shifting right and converter is locking when it shifts into 2nd gear and won't unlock. I'm throwing code p0740. Can I please get some help! Quote Link to comment Share on other sites More sharing options...
zippy Posted June 28, 2014 Report Share Posted June 28, 2014 Do you have any software to log it with? Did you have a segment swap done? Is the speedo reading correctly? Quote Link to comment Share on other sites More sharing options...
dylanT Posted June 29, 2014 Author Report Share Posted June 29, 2014 I work for cold air inductions. I have a guy who tunes I personally don't think he's the best but never had a problem. Using hp tuners and I did not have a segment swap done speedo seemed to be reading right Thank you for taking time to read this! Quote Link to comment Share on other sites More sharing options...
AKSSS Posted June 30, 2014 Report Share Posted June 30, 2014 I work for cold air inductions. I have a guy who tunes I personally don't think he's the best but never had a problem. Using hp tuners and I did not have a segment swap done speedo seemed to be reading right Thank you for taking time to read this! If you haven't had a segment swap the only other way to control the 4l80 is with the relay control deal? If you didn't do either then that is your problem. Quote Link to comment Share on other sites More sharing options...
dylanT Posted June 30, 2014 Author Report Share Posted June 30, 2014 Ya that's pretty much what I have read, I'm going to email hp tuners tomorrow and get the segment swap started. Hopefully have the trans all figured out by the weekend! Quote Link to comment Share on other sites More sharing options...
AKSSS Posted June 30, 2014 Report Share Posted June 30, 2014 Here is the wiring that you have to change. Quote Link to comment Share on other sites More sharing options...
1BAD2K Posted June 30, 2014 Report Share Posted June 30, 2014 Yep. Either need relay method mod, or segment swap. Personally, I am going with the segment swap since they fixed the tcc issue that was previously a problem. Quote Link to comment Share on other sites More sharing options...
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