keniff, I have questions in regard to operating the vss in the tranny for the computer. I know Advance Adapters sells a kit # 716073. My question is if I adapt to my original tranfer case which is np208 withthat adaptor how do I pick up the signal for the elect. speedo off of that? Or is this a question for the wiring company since I plan on running a custom made harness? I am planning on running a Dakota digital dash. If it matters the engine and tranny are out of an 08 silverado 4x4. Would it be easier to run a 88-91 K5 blazer np241 transfer case with the right hand drop? From what I have been reading they have the proper 40 pulse vss sensor on it already. I appreciate everyone's time with helping me with this I know I have alot of questions.