[Steeveedee]

From what I've read around here, and I may have part of it wrong, the Longhorn doesn't necessarily have the D60. I think that that comes with the Custom Camper equipment, which also gives a 1T frame, even on the 3/4T. Here is the SPID from my truck for reference. It isn't just a Longhorn (though it it never got the "Longhorn" scripts, for some reason, probably alcohol-related), it's also a Custom Camper, so maybe that muddies the water a little as far as the rear axle goes.