When the honeycomb in my cat let loose from the casing, it was a rattle
on deceleration and at idle, but then quieted down under throttle as the
exhaust volume pinned it against the back of the casing.
I don't know if it's the same rattle. Mine sounded like a bearing going
in the trans for a while, then it turned into a sound like rocks in a
blender on low speed.
On 8/31/2012 10:21 AM, Ken & Janet Olson wrote:
> ----- Original Message ----- From: "Mike Burgess"
> To: <firstname.lastname@example.org>
> Sent: Friday, August 31, 2012 10:14 AM
> Subject: DML: rattle on long deceleration
>> While pulling a pretty heavy trailer, and using engine brakeing
>> (overdrive selector OFF) on a 10 mile downhill grade (Grapevine, in
>> southern california) I started getting a "rattle" or odd buzz (almost
>> like a bearing spinning out !) from either engine or trans. It
>> cleared right up, when I give it a tiny bit of throttle, and returned
>> right afterward, but it ain't normal. Ideas, theory's ? did not
>> return after flatland driving and using engine brakeing.
>> 5.2L , autotrans w/OD 1998 Dakota, 210K miles
> Couple outside of the box ideas: Catylitic converter heat shield or
> rear transmission mount.
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