L31 411 4x4 swap

[1project2many]

Hi,

Many of the '01 and '02 Express van L31 + 4L80E calibrations appear to be fully compatible with 4X4 vehicles. A number of the van files on gearhead-efi came from cutaway vans in our fleet and are definitely set up to work with a GM 4X4 vehicle. I believe several of the 6.0 + 4L80E calibrations were the same way. Look at the option flags to confirm 4X4 is selected then look at the constants to ensure the transfer case low ratio is correct. If I think of anything else to check I will post it here.

Here's an 0411 with 6.0, 4L80E, 4X4 cal.