1986 IROC-Z, 305 , 700R4 , 3.23 Rear

Recently the exhaust has taken on a noticably quite tone, kind of a "whoosh" sound. At the same time the power of the car has dwindled greatly. Going uphill the car will shudder and shake around 3000-3500 rpm and won't shift to third until you let off on the gas a little, but normal driving on flat land the transmission shifts fine. Don't want to replace the transmission if the problems lies in the exhaust !!!! Question - would a clogged converter cause problems that you could mis-diagnose as transmission failure ??? These shifting problems only occur under heavy acceleration, is the transmission missing it's shift points because the rpm's aren't getting there fast enough ?

 

How does your exhaust smell?

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1988 Jet Black IROC
5.7L W/ 64000 miles
Flowmaster Exhaust
Fully Loaded
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My IROC In Readers Rides
My IROC

 

Go hit your cat with a mallet and see if you hear anything banging around inside.

 

All you need to do is rap on it with a knuckle... unless it's hot, then I'd use a mallet ouch! If there is a rattle then the cat is busted and you need a new one. If it was gutted it would sound hallow. I assume you haven't gutted it though...

 

My exhaust smells like gas....actually my whole garage smells like gas after about 2 minutes of it being in there.

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87 FireBird Formula
305 4bbl LG4
K&N Filter
Flowmaster 80 Series
Holley Quadra-Jet 650 CFM 4bbl Electronic Carburetor
P215/65R15 Tires
-----Need Upgrades-----
--Give suggestions plz--

http://members.tripod.co.uk/michigan34/car.html

 

just fix it the old fashioned way - rip it off and weld a piece of exhaust pipe in its place! your car will sound meaner and you'll get better gas mileage, too!

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1984 Firebird S/E
305 V8 (LG4), 5speed
Holley 650 cfm 4bbl
Edelbrock headers
Flowmaster 80 series
No cat
3.73 rear
P275 60 rear tires
P245?50? front tires