Front Exhaust Mount

How come the front exhaust mount (under tranny) does not have an rubber to isolate it from the car? I though that exhaust systems were to be completely flexible.

I know the center and rear have rubber mounts. Is the rear one even necessary?

Jeremy.

The front of the exhaust pipe is connected to the engine by way of the manifold. There is no movement of the exhaust pipe with respect to the engine and trans. Just to the rest of the car, because the engine and trans are supported on rubber mounts.

The front strap just gives the pipe additional support, before it heads back to the first rubber mount to the body.

Kelvin.

:P

Didn't think about the rubber mounts on the tranny.

What a waste of forum space!

Thanks!

I will note that the part of the brace that actually fits on to the lower two bell housing bolts is supposed to be slightly slanted, that is, angled down just a little toward the pipes. The new one that I received from Moss the other day is just straight across and requires that the intermediate strap be curved/bent down a little in order to make the joint with the O-ring around the pipe.

BTW: It is best to install this brace when you are replacing the O-ring gaskets between the down pipe assembly and the manifold.

Jack

If there was movement between header and engine those do-nut gaskets
wouldnt last too long..
Proper install allows both to move as a unit.

Mine comes straight down from the engine. 1 piece exhaust. Does that make a difference?

As I understand it, the front mount piece locates the pipe structure side-to-side more than it does up and down. it is (apparently) this side-to-side movement that uses up the donuts.

Years ago, not understanding this, I did not install a front mount. Do-nuts have needed replacement more often than I like. And I'll rig a lateral support next time I go under there.

Jack--why down slightly? Is that simply because that's the way the downpipe positions the stuff relative to the bottom of the trans or is there some other reason?

Slightly off topic here. But how the heck does the rear hanger assemble?

Something just doesn't look right.

This looks correct to me.

Then how are they supposed to line up?

Jeremy,

Just took a look at my '74 B GT, and the rubber spacers/mounts are on the other side - to the inside - of the larger piece (# 34 on Moss drawing), then the top piece in your photo (# 33 on Moss drawing) goes on the rubber mounts. That piece - #33 - is actually the inner part, and is closer to the exhaust pipe. If you need a photo, I can get you one tomorrow.

Harry

Rear hanger - The rubber was long gone.

As I recall there was a short period in 74 during which they used an exhaust that did not feature a converter, but used a manifold similar to the later cars that did. This would put you into the single down-pipe group.

The cross brace from the bell housing would be the same though.

Chris, the reason that the intermediate strap between the O-clamp and the fixed bell house braket ends up being a little curved is because the replacement bracket on the bell house is straight across. The OEM bracket had a slight incline to it that resulted in the intermediate strap being a straight shot downward a little over to the O-clamp.

Jack

Awesome! Thanks, Harry.

That damn bracket on the tailpipe is one of the hardest things to assemble! You need at least 3 hands and a very large vocabulary of curse words. It was designed by a sadist. RAY