How necessary is this shield?
Le Mans Master
Joined: May 2008
Posts: 9,063
Likes: 2,736
2022 C3 of the Year Finalist - Modified
If I am correct, this is a stock shield that was at least used on 1977 Vettes, as mine had one.....and it was installed with a standard metal leaf spring. So, I don't think GM added this in any many as a heat shield for a fiberglass spring, given they didn't install fiberglass springs on a 77.. So my guess, it somehow shields heat from the differential???? Anyone know why?
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Safety Car
Joined: Jun 2004
Posts: 4,364
Likes: 221
From: Beecher Illinois
If you have a catalytic convertor in place definitely use the shield. Lot of heat from the cat radiates through the exhaust pipes.
Otherwise you can probably go without if you really want to. But why?
I feel that shield is also to protect the differential.
Otherwise you can probably go without if you really want to. But why?
I feel that shield is also to protect the differential.
Instructor
Joined: Sep 2011
Posts: 145
Likes: 22
From: San Francisco CA
It seems to me you must consider all the heat coming from the engine compartment and exhaust, including the cat. When you are at speed that hot airflow is passing under the car and the diff.
the concern would be the overall effect on the diff oil temp. It seems no surprise to me that they installed this after the introduction of cats and higher temps to reduce emissions.
Too much temp in the diff will reduce its life expectancy
the concern would be the overall effect on the diff oil temp. It seems no surprise to me that they installed this after the introduction of cats and higher temps to reduce emissions.
Too much temp in the diff will reduce its life expectancy
Melting Slicks
Joined: Aug 2016
Posts: 2,343
Likes: 1,173
From: CLEVELAND STUCK IN OHIO
2024 C3 of the Year Finalist- Modified
My 2 cents,,,
If your concerned about, dirt and debris, clean it out at each oil change or tire rotation, then re install it as factory thought it was helpful, if you don't like the look, then put it on the shelf,, 
