Hello, My name is Branden Jones I own a 1980 K10 Chevy Truck. My truck has a stock np205 transfrercase, and a stock Th350 Transmition. I just reciently baught a 2 wheel 700r4 transmition. I have done alot of research on converting the th350 to 700r4 but I belive I have done too much because I dont understand what all I have read. I have read so much that counterdicts eachother that I dont know what is right. I understand that the th350 is apx. 22 inch long and the 700r4 is apx.23.6 inch long. I measured this myself So either the Xfer case needs to be moved back to compensate with the motor location and the rear drive shaft will need to be shortened and the front shaft will need to be longer or the motor mounts will need to be reloacted. I understand all this. Where It gets a little fuzzy to me is the spline alighnment. The sock th350 is a 27 spline? So what is the stock 205 xfercase? What needs to be done to the 700r4 tranny to bolt up to the np205 xfercase. I have read about if it is a xfer case that bolted to a th350 the splines in a 700r4 will mesh perfect it will just need to be shortend. I have also read that Advance Adapter makes a output shaft that is needed to be installed in a 700r4 to meet the splines with a np205. So what is right? Also There is a adaper plate to mount the stock th350 to np205 plate to the 700r4? From what I measured on my 700r4 after the tail housing is unbolted the 4 bolt pattern is the same as the stock th350 to np205 adapter. So my 700r4 will bolt directly up to it. why is a adapter plate needed? MY PLANS ARE ...... Unblot the tail housing off of my 700r4 bolt it to my np205 Leave my np 205 in stock location leave my drive shafts in stock locations. Move my engine the app amount foward to compensate for the longer tranny by relocating the motor mounts. Sounds like a better way to me because it solve the problem with the distributer sitting directly up against the firewall, and I dont have to have special drive shafts made. SO with all that said what exactly do I need to have the output shaft from my 700r4 tranny to "line up" with my np205? I am by no means a tranny guy, I am not going to tear down a 20k mile 700r4 to change a output shaft that might just needs cut down? Also are the splines the same or not? If this is going to be to big of a project I need to get a xfer case that will bolt directly up to my tranny and then get custome made drive shafts???? can someone please tell me where I am wrong and where I am right and what I need. If someone can I will do a DIY with pics for everyone to reference, Thanks in advance AHHHHHHHHH this is driving me nutz!!!!!