Thanks Paul, no need for the dimensions, they're in the parts book.
Interesting to see a picture of the real thing and where the
baffle's spot welds were made. Not only is it in the original
box but I see the part number embossed in the shell.
Book says 41-49 Comm, Utility 19 1/2", 2"od exh. flange,
1 11/16 od tail pipe flange.
It's not totally clear when they give the OD of the flanges
whether they are talking about the OD of the flange or the
OD of the pipe that would go into the flange. My guess would
be that it's the later.
What we see as a replacement all to often, are the round
mufflers for tractors sold at the farm stores or FLAPS.
I have often thought about rolling my own from SS. It wouldn't
be to hard to fabricate one that looked exactly like the
original ones, short of the embossed numbers. I'm sure the
baffling inside couldn't be to fancy. I'd love to see an
original one cut apart (Brad)--I know there are bound to be a
few original ones that are rusted thru by now just waiting to
be replace. Was pretty common back in the day to replace the
exhaust system at 30 to 40k. A muffler for the same application
with the same dims was available from Chevy in an aluminized
version, pn. 809750.
Don't understand why they changed the tail pipe size from the
41-49 muffler to the 50-55 muffler. It's a different part
number 3693710, aluminized it was 3794250. Only change in
the two that I can see is the tail pipe flange went from 1
11/16" to 1 51/64". Obviously the later trucks went to a
larger tail pipe diameter for some reason which makes no sense.
Thanks much for the picture.
Denny Graham
Sandwich, IL
A good Tech Tip
