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Re: Question for a "friend" [message #362887 is a reply to message #362884] Wed, 17 March 2021 08:24 Go to previous messageGo to previous message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
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Senior Member
Muffler bearing is a slang term (usually regarding a shop charging an unsuspecting customer for a mythical part) However on the GMC they have taken on the meaning of the silicone rubber isolators that the long 2 1/2” pipes pass through to keep them from rubbing the frame. The rubber grommet is GM 712307 and the bracket is GM 712306. 2 sets are used along the pipe.
The part you need is the SEAL- manifold or GM 387897. These are 2 1/4” and available from Felpro (Federal Mogul) or Nickson exhaust parts. I have had longer lasting results with the Nickson. The Felpro have a blue coating and the Nickson are a natural graphite finish on the sealing ring.


John Lebetski
Woodstock, IL
77 Eleganza II
 
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