Dodge: replacing a cat.,converter, muffler shop, dodge pickup

Question
I have a 1986 dodge pickup D150 1/2ton 4x2 3.7l 1barrel L6 .
Catalytic converter needs replacing. do I need to have the replacement welded on or would it be possible to cut the old one off at the ends of the converter and put in a new one using pipes and clamps? Truck was free,runs good and I really dont want to have to go to Midas or some other shop and pay through the nose to have a universal converter welded in.

Answer
Pete,
It is possible to just bolt it on with pipes and clamps,but i guarantee you when you get started with it you'll wish you would have taken it to a muffler shop.I'm telling you this because 1 week ago to the day i was going to try exactly what you mentioned.It took the most part of the day to get the converter on and when i bolted it,it leaked around where i connected it.And i still had to take it to a friend of mine that has a muffler shop to have it brazed.I'm not saying not to try it,just saying that it's a big pain in the but.