I have the stock NP231 and wanting to put a 14 bolt ff rear and a HP D60 front. Q are they the same lenght or do i have to get one of them cut down and will the diffs line up to my TC?

http://www.pirate4x4.com/tech/billavista/14b_bible/index.html
http://www.pirate4x4.com/tech/billavista/60_front/index.html

Read and learn.

thanks for the links this helped me a lot