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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2016 Posts: 1,101 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 1,101 | I wasn't sure where to post this. I guess I am just looking for confirmation of what I suspect. I just had my entire exhaust system replaced on my 54 3100. It still sounds very loud, not just in the cab but outside also. I have not done any sound proofing to the cab. Would it sound so loud because of the "tin can" affect of the cab echoing and amplifying everything. | | | | | Joined: Apr 2020 Posts: 322 Professional procrastinator | | Professional procrastinator Joined: Apr 2020 Posts: 322 | What muffler did they put on? Years ago I needed a new muffler for my work van. One of my employees took it in and proudly came back with new Flowmasters. One drive in that thing and I had them yanked and quiet ones put on. Talk to the shop that did the exhaust system, that might be your best bet.
1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed
| | | | | Joined: Jun 2022 Posts: 557 'Bolter | | 'Bolter Joined: Jun 2022 Posts: 557 | I measured the inlet, outlet and length, then went to NAPA and got a 60 dollar muffler... runs quiet as a mouse.
~~ Jethro 1954 3100Back to LifeIn the Dity Gallery1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020 | | | | | Joined: Jan 2016 Posts: 1,101 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 1,101 | Not a Flowmaster. It's hard to describe. It is just loud, not like loud pipes or bad muffler. | | | | | Joined: Feb 2016 Posts: 1,982 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,982 | Is the system isolated from the frame and any other components, vibrating on something?
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | Check the mounts and routing. If they used hard mounts or routed it too close to something under there, you will get a lot of noisy. | | | | | Joined: Sep 2009 Posts: 5,777 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,777 | Dave,
Where did you have them terminate the end of the exhaust???
If it's still in front of your rear axle like I can see in your photos from your signature line, extending out the back of the truck fully should help reduce your cab noise level.
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Oct 2021 Posts: 6,695 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,695 | My truck has stock exhaust and muffler and is the quietest part of the truck. It's the valve train that makes all the racket.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Jul 2014 Posts: 1,289 Moderator for Tons o' Fun , Co-Moderator Driveline Forum | | Moderator for Tons o' Fun , Co-Moderator Driveline Forum Joined: Jul 2014 Posts: 1,289 | Ditto on what Otto said. My 54 has a "stock" system from Waldron's and all of the original rigid hard mounts for muffler and tailpipe are there. Exhaust is quiet, valvetrain....not so much.
Last edited by Dusty53; 10/14/2023 1:11 PM.
Ron - - Dusty53 1954 Chevy 3604In the Gallery Forum "You can't dance with the Devil and then wonder why you're still in Hell."
"They will forget what you've said, and they will forget what you have done but they will never forget the way you made them feel." | | | | | Joined: Mar 2010 Posts: 10,271 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,271 | An original truck's entire exhaust system was hard mounted from stem to stern and was quiet as a mouse. You probably need a stock style muffler to preventing the "shiver me timbers" effect.
PS. I offer no apologies for the Navy vernacular. Go Navy! (and Go for the fellers who the Navy gave boat rides too. You know who you are...)
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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