Quote Originally Posted by 1project2many View Post
There's a thread for folks looking for a GMT800 calibration for an L31 engine. One of our members uploaded a 5 speed L31 calibration to that thread.

http://www.gearhead-efi.com/Fuel-Inj...he-1-meg-PCM-s

Unfortunately there are no calibrations in that thread besides the manul trans calibration. If you'd like to add your VIN it may open a door in the future. I tried searching a few sites oriented toward used vehicle sales in Mexico but no luck so far.
I segment swapped that file to use a 4L85E (4L80E) for my 97 as the operating system matches some US built 2005 trucks. Then I fixed alot of the idle and DFCO settings for an automatic. Idle speed in part of the tables set to zero, etc.