My intent with this thread is to gather, document, and photograph information about rebuilding a Ford NP273 transfer case and adapting it to an Allison transmission. It will be replacing an NP263XHD. This is a list of what you'll need: - A Ford NP273 - 29 spline Dodge input shaft - clocking ring - 40 tooth reluctor wheel - VSS - Kodiak shift cam GM pn 89059210 - two new drive shafts You need to swap the input shaft because the Fords are 34 spline, but (luckily) Dodge and GM are both 29 spline. You need the clocking ring because the bolt pattern is off from Ford to GM and also because of the massive size of the 273 case. It will try to occupy the same space as the ABS module, but we'll get to that later in this documentary. You need the reluctor wheel and VSS so your speedometer will work. The Fords didn't have them in the tail housing of the transfer case like GM does, so you'll have to drill and tap for one. The tone ring/reluctor wheel can be held to the output shaft a few different ways, but I believe I'm going to clamp mine on for easy removal if it's ever needed. You need the Kodiak shift cam because the shift patterns are different from Ford to GM. You'll be using the stock encoder/shift motor from the 263XHD and apparently they shift backwards from each other. I believe the encoder motor is what tells the truck when it's in low range so the speedometer reads properly and the transmission knows when to shift. I have drawn this conclusion because neither case appears to have an indicator switch like manual shift cases. You'll need two new drive shafts because...well...you already know why. My plan is to source them from an F250 and have the front shortened to fit and use the front flange from the rear or possibly use the entire assembly. We'll see how it works out when the time comes. That pretty much covers the bulk of what you need to gather to get started.