Really, I would never ask a question like this . My "friend" has a 77 E-II (much like mine). He sensed that he had an exhaust leak near the engine so reached into area where his exhaust pipe is connected to the cast iron manifold and he could feel the leak (the engine was running, so he says). So I, I mean my friend looked in at the Applied website and found muffler bearings that seemed to be what he might need. Too embarrassed to ask about "muffler bearings" himself, he asked me to ask about them. They are not priced on the Applied website so my friend is thinking they are just a continuation of the muffler bearing urban myth scenario. Maybe a bit of whimsy from Jim K or Nick? Anyway, my friend needs to cinch up that joint. He thanks you for any info you can share. I have to leave now. Snipe hunting season opens today.

Thanks to all. So the muffler bearing that Jim K has on his site is NOT what I am looking for? It looks similar to various exploded views of the Toronodo exhaust system. He also has those spring bolts. I am away from my coach until Sunday so I thought I would get things lined out.

LNelson wrote on Wed, 17 March 2021 07:07

Really, I would never ask a question like this . My "friend" has a 77 E-II (much like mine). He sensed that he had an exhaust leak near the engine so reached into area where his exhaust pipe is connected to the cast iron manifold and he could feel the leak (the engine was running, so he says). So I, I mean my friend looked in at the Applied website and found muffler bearings that seemed to be what he might need. Too embarrassed to ask about "muffler bearings" himself, he asked me to ask about them. They are not priced on the Applied website so my friend is thinking they are just a continuation of the muffler bearing urban myth scenario. Maybe a bit of whimsy from Jim K or Nick? Anyway, my friend needs to cinch up that joint. He thanks you for any info you can share. I have to leave now. Snipe hunting season opens today.

Larry,

Yeah, the muffler bearing goes in right next to the doohickey. Seriously, there is such a thing as a muffler bearing. Probably a little miss named as exhaust bearing might be a bit more descriptive. In the GMC, we generally have a couple of types. One, which is the one you are having an issue with is where the exhaust pipe connects to the manifold (sometimes called a donut). These are readily available at auto parts stores. Just take the old one to make sure you match the size and configuration. On the tailpipe where it runs down the passenger side, there are muffler bearings that hold the tailpipe where it passes through the cross members.

We are getting ready to leave for a week or two trip somewhere south but you would be welcome to bring your (or your friend's coach) over and put it up on my lift - makes a job like this much easier