Greetings!  I have a 1995 GMC K1500 extended cab.  I recently had a friend replace my worn rear u-joint (the one before the rear axle). First, the auto parts store that I bought th new ujoint from sold me the wrong size, it was just a touch too big (I am new to drivelines and truck mechanics and took their word for it).  So the dude (whom used to be a mechanic) proceeds to use a press, and a ball peen hammer, to try to make it fit.  Long story short, he had to buy me a new driveshaft.  My stock driveshaft is 60" from weld to weld.  The one that got sent to me (used) is 59 1/4.  He assures me that even though everything is 3/4 of and inch shorter, the difference wont affect much.  Is he right?  Will the shorter shaft be safe, or should i scrap it all and break down and have a new shaft made (as I live in the boonies and the cheapest shaft available to me is a new taylor made steel one for $350)??  HELLPPP!!!  

Make a trip to big city with new drive shaft to a drive shaft shop and have them lengthen or retube it. It is easy with right equipment and not too expensive and a lot cheaper than a online driveshaft supply that pays someone else to make it thei marks it up and sells it to you.  

They can lengthen, or weld, or whatever, carbon fiber?  I was told thats why my driveshaft is.  Like I said, I am new to this, and most of my mechanical experience is engines and electronics.  But I will definitely look into this!  

your drive shaft is not carbon fiber. its aluminum.