A trans tech at the dealer I bought my 06 from said I would be better off to upgrade mine than to do a swap because he sees just as many allison transmissions in the shop as he does any other. This was a shop that deals with a Chevy Ford and Dodge dealer too.
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'06 3500 Sport 4x4 QC DRW, 48RE, Sunroof, Loaded, 6" Superlift, 37" Toyo Mt's, Quad Commander & Xzillaraider, Therminator Muffler, Gutted Intake, Silencer Ring Gone...
'96 3500 4x4 DRW, 5spd., 3KGSK, 12mm Studs, 60lb Springs, No Plate, Starwheel Cranked, Disabled Wastegate, Isspro Boost & Pyro, BHAF, Silencer Ring Gone, 4" Turbo Back...