84Elky

This discussion applies to $8d AUJP but also applies to any other mask that receives transmission input.

4L60 transmissions with a 5 Wire Connector can have the status of 2nd and 3rd gear reported with proper wiring to the ECM. This has value if logging while racing to show exact shift points. Thanks to RBob for the idea that this reporting might be possible and to Sharp38 for testing it.

The diagram below is from a Painless Performance Products wiring harness instruction manual. It shows the conversion of a 700R4 4-wire connector to a 5-wire connector of a 4L60:



If the following connections are made to the ECM, the status of being in 2nd and 3rd gear, in addition to the currently available 4th gear status, can be reported. The 7727 Pins are listed but have not been tested:



The recently updated v7 S_AUJP ADX files contain the Bitmasks to report 2nd and 3rd gear status, available here (Revision 2):
https://www.thirdgen.org/forums/diy-...ion-7-now.html

One other note about reporting 4th Gear status. The older 700R4 transmissions had a Normally Closed (NC) 4th gear pressure switch. Around the time the transmission name was changed from 700R4 to 4L60, some of the newer transmissions had a Normally Open (NO) 4th gear switch. GM made provision for both switch types in the code.

However, there’s a wrinkle. If a NO switch is installed, the 0x031 reporting of 4th gear status will be reversed. This means with a NO switch, the text of the ADX Bitmask (0x013 b2) reporting 4th Gear Status True/False conditions must be swapped:
If 4th Gear Switch is NC (Default: 0x016 b2=0)If 4th Gear Switch is NO (0x016 b2=1)