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Old 04-10-2007, 03:58 PM
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79 TA, rear air shocks psi?

Somebody beat me to the 70 firebird. So sad. Anyway still fixing things on the 79 while I got it. My rear air shocks got about 28 psi in them, just wondering what should the psi be? I have no idea, I don't want to overdo it, that's just gotta be bad, but I think 28's a little low.

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Old 04-10-2007, 11:00 PM
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Did 79 Trans Ams originally come with air shocks ??

I had a new 72 T/A ... and we always wanted the T/A's lower ... to handle better ...

72 T/A ... 455 HO, 400 Turbo ... with a set of 1970
Ram Air IV heads and 1.6 rocker arms ..
Drove off from a 73 T/A with the 455 SD ... more than once ... ( every time )
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Old 04-11-2007, 02:21 AM
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I've owned a few sets of air shocks; one on a wagon, one on an El Camino, and one on an S10. I forget what brands they all were, but they all were the same psi range; 20-120. They say not to run them under 20 because the bellows collapse and rub against the shock body. I'd double check before going all the way to 120, but I'd definitely keep them above 20.

Keep in mind that the air pressure won't affect shock function. All they will do is raise the vehicle and artificially raise the overall effective spring rate. You will be removing weight from the springs and placing it on the little shock mounts. Ideally in a car that is designed for handling, there should be no air shocks unless you want to carry a little weight without dragging. Otherwise they offer no benefits at all.
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Old 04-11-2007, 08:53 AM
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Quote:
Originally Posted by curtis73
I forget what brands they all were, but they all were the same psi range; 20-120. They say not to run them under 20 because the bellows collapse and rub against the shock body. All they will do is raise the vehicle and artificially raise the overall effective spring rate
I've had Monroe's on my Olds as long as I can remember. Curtis73 nailed it for you. Keep them above 20 psi. As long as you're happy with the ride height of the rear of the vehicle you're set!
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Old 04-11-2007, 12:24 PM
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thanks for the help guys.
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Old 04-11-2007, 01:25 PM
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Quote:
Originally Posted by curtis73
Keep in mind that the air pressure won't affect shock function. All they will do is raise the vehicle and artificially raise the overall effective spring rate. You will be removing weight from the springs and placing it on the little shock mounts. Ideally in a car that is designed for handling, there should be no air shocks unless you want to carry a little weight without dragging. Otherwise they offer no benefits at all.
What Curtis just explained (nice explanation BTW) is the key reason behind why most people argue AGAINST running air shocks on f-bodies. The f-bodied cars are known to be weak where the rear shocks mount. It is not uncommon to see damage around the rear upper shock mounts on f-bodies running air shocks.

If you must keep the air shocks, you are wise to keep them at 20 psi to minimize the weight transfer from the leaf springs to the shock mounts.

With that said, I ran air shocks on my old Camaro for 4 years (until I sold it) with no trouble. I'm now running gas shocks on my current Camaro - and the ride is much nicer...
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Old 04-11-2007, 09:55 PM
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Be sure the air supply for each shock is separated from the other one. Connecting them will cause excess body roll in turns, which causes the car to feel kinda squirrelly, and can sometimes cause the fenders to hit the tires.
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Old 04-19-2007, 02:41 PM
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Quote:
Originally Posted by Big Mouse
What Curtis just explained (nice explanation BTW) is the key reason behind why most people argue AGAINST running air shocks on f-bodies. The f-bodied cars are known to be weak where the rear shocks mount. It is not uncommon to see damage around the rear upper shock mounts on f-bodies running air shocks.

If you must keep the air shocks, you are wise to keep them at 20 psi to minimize the weight transfer from the leaf springs to the shock mounts.

With that said, I ran air shocks on my old Camaro for 4 years (until I sold it) with no trouble. I'm now running gas shocks on my current Camaro - and the ride is much nicer...
And they wil break. The lowers will too. May I suggest you start planning on getting new springs.
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Old 04-19-2007, 11:43 PM
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so ure saying I should get rid of the air shocks, or leaf springs?
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Old 04-20-2007, 07:30 AM
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The "right" thing to do is to dump the air shocks if you can. Replacing the air shocks with some standard shocks is cheaper than repairing your shock mounts or having to replace your broken leaf springs.

I was lucky with my old car that nothing broke, but many, many, many Camaro's have trouble with air shocks.

Go check out some of the Camaro/Pontiac or Z28/TA sites. The overwhelming majority says "no" to air shocks...
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