@kidturbo So today I came across something I found interesting. While at a dealership that I do a lot of work for in northwest ohio, they happenned to have a 2015.5 Sierra 3500 duramax on the lot. I did some looking, the new vss sensor is in fact the bolted in style instead of the threaded in style and has the T87 tcm but strangely has what I believe is the 86A ecm which made me go hmmm as that is not GlobalA as far as I know. They also have a 15 Silverado high country with the 6.2 and 8 speed 8L90 trans which happens to use the same T87 TCM. I look underneath and, look at that, the threaded in vss sensor on the transfer case just like all the 15 and older duramax trucks, after taking both vins to the parts counter and looking them up, both the 15 high country and the older duramax trucks using my 2010 vin for reference use the same part number vss. After looking at the wiring schematics through gm SI both trucks 15 HC and 15.5 3500 duramax use the same VSS and Input Speed inputs 9v referenced same pins. As soon as I got back home through the great sloppy snow we got during the day and now becoming rain, I brought the vin for the 2015.5 duramax up on Techline and with a new t87 on the bench fresh out of the box I plugged in my bench harness and went to SPS programming to look at calibration numbers to find the first time I have ever seen it happen, TCM T87 "k71" programming not requiring an ecm connection. So I unplugged the 86A ecm on the bench with it and closed everything out and reopened and programmed the T87 with the duramax vin from today, and amazingly it went without any problems and nothing plugged in except for the t87 and the mdi on the other end with a 120ohm resistor to terminate the canbus since the tcm doesnt have a terminating resistor in it. I pinned the new vss 19302667 threaded sensor to the tcm and the new turbine speed sensor 24276402 to the tcm and it seemed happy with both sensors. Wish I had a spare e35b laying around to connect it to and see if by chance this calibration was happy with the ecm as well. Wondering if this calibration is in fact able to work with the same ECM as the a50/t14 and knowing the a50 was in my 2010 originally before it bit the dust and i had to put in an a40 i had laying around as a spare, what are the odds that this t87 calibration would communicate with my e35b. Only thing my truck doesnt have that the 11-up trucks do is the line pressure control solenoid which I could simply put in a resistor across those terminals for now to make it think it is there. I pulled the t87 calibration via efilive if you want to look at it and see if you can find anything. I also went into the temp folder for SPS and saved a copy of the tis files.
