Shortened Driveshafts

[Linz]

Hi Guys

After a bit of searching I haven't really found an answer (if it's been covered I apologize) I have a 72 (longbox) and have recently done a 2/4 suspension drop. On my first drive since lowering it I managed to rip the welds from my hanger bearing hence the driveshaft dropping down. I managed to find a welder and tack it back up to make it home where it drove fine. I'm thinking this is just to much of a coincidence being it was fine before hand. So my question is do I need to shorten my driveshaft and if so how to go about it. It's a 2 piece so the front section or rear section or both?? I have an excellent driveshaft shop close perhaps they can advise. I was just curious if anyone else had run into the same problem. I bet I only need an inch or so shaved of. I'm thinking this is for sure the problem. Truck had factory heavy duty coils to start with so it was quite a drop.