I need to shorten the front shaft on my Blazer. Because I am a poor sap, someone loaned me a stock shaft to use until I can get mine done. Here's what puzzles me. The stock shaft came out of a mid to late 70s K5 350/350/203 with a D44 front. My rig is a 72 with a 350/350/205 and a D44. I also have a 4" susp. lift. Why is this stock front shaft longer than the one I took out of my lifted truck ?