I just replaced my muffler with an OEM. The factory one lasted one month shy of twenty years on the truck.
Notes:
1) Due to the age/rust of the bolts, I bought all new hardware. I dremeled off three of the old bolts and was able to use a sawzall on the other. A twenty pack of the Dremel 426B reinforced wheels works well. Don't use the quick change dremel bit - too wide and you trash it if you try to get in tight on a bolt(as I did...). The sawzall works better if you use the dremel to cut a starter notch to put the sawzall blade in.
2) Use silicon to spray the rubber and hangers to make them move easily.
3) Set the hanger back on the muffler post for the two rear-ward hangers so you can just slide them on - easier when you are pushing them upward(see photo).
4) For setting the rear muffler pipe into the reasonator pipe:
a) make sure the inside of the resonator is cleaned up and that you line up the stud on the inside of the resonator pipe with the notch on the muffler pipe.
b) I wound up tapping the pipes together with a heavy screw driver and a rubber mallet to get them tight enough for the angled gasket to set in place.
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