PSI range for air shocks on a 69 2dr post - Chevelle Tech
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post #1 of 18 (permalink) Old Aug 11th, 19, 7:05 PM Thread Starter
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Josh
 
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PSI range for air shocks on a 69 2dr post

Hi all

I know there are mixed opinions on air shocks but that’s what I have on the rear for now at least

It’s a 69 300 deluxe w AC and a 350 crate engine

What pressures range can I safely run without concern (I like a higher rear end)??

The car was rebuilt a couple years ago - it’s not a rust bucket

Thanks
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post #2 of 18 (permalink) Old Aug 11th, 19, 7:18 PM
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Re: PSI range for air shocks on a 69 2dr post

What brand and what part number? I've seen max ratings from 75 to 150 on various brands. Minimums are usually 15-20 psi. Usually, they give a tag to install under the Schrader valve with the shocks that gives you max and minimum numbers.
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post #3 of 18 (permalink) Old Aug 11th, 19, 7:29 PM Thread Starter
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Quote:
Originally Posted by DUTCH MAX HEADWORK View Post
What brand and what part number? I've seen max ratings from 75 to 150 on various brands. Minimums are usually 15-20 psi. Usually, they give a tag to install under the Schrader valve with the shocks that gives you max and minimum numbers.
Thanks

I don’t know the brand or model I am afraid. Installed before me and not label just painted black. The valve has a metal ring with red print the states 100 psi max but I assumed that was a generic tag

I ran 55/60 today with the wife and two kids plus camp chairs etc as the tyres kept rubbing the arches but I wondered what the safe upper range is - how high is okay...

Cheers

(PS - my Dutch mother in law was as over today!)
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post #4 of 18 (permalink) Old Aug 11th, 19, 7:37 PM
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Re: PSI range for air shocks on a 69 2dr post

I'd go with what the tag says as a max. If they are of unknown age, might want to stay below that number.


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post #5 of 18 (permalink) Old Aug 11th, 19, 8:27 PM
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Re: PSI range for air shocks on a 69 2dr post

The factory Air shocks were called " Super Lifts " The normal range for driving with the car not loaded is around 10--25 Lbs. Just so you know,,, When you shoot them up with a ton of air, You may or will cause the lower shock bracket to fracture.
Also , When you JACK UP the rear of the car , Your Center of Gravity totally changes and your handling quality goes in the TOILET !
Tires rubbing= Backspacing or SMALLER tires.
Its your car ,, Do what you want. BUT...... Do this in a SAFE WAY !
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post #6 of 18 (permalink) Old Aug 11th, 19, 8:41 PM
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Re: PSI range for air shocks on a 69 2dr post

Living near a set of train tracks. I would pump them up pretty solid and put people in the back seat.

The mother in law refused to ride in the back after she bounced off the ceiling.

-------


I had a late 60's Dodge van, I removed the front bolts out of the rear seat.
When I stepped on the gas the seat fell backwards.

She laughed so hard at that one she peed herself, but the wife was mad. Lol.


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post #7 of 18 (permalink) Old Aug 11th, 19, 10:41 PM
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Re: PSI range for air shocks on a 69 2dr post

Josh, please post pics of your '69 300 deluxe. Terry
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post #8 of 18 (permalink) Old Aug 11th, 19, 11:23 PM
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Re: PSI range for air shocks on a 69 2dr post

I have air shocks on the 70 conv, with factory air cond.
When I built the new motor (SB400) in 98, I added BB front coils and only added air shocks in the rear (Gabrial I think).
For normal driving, I keep 5-10psi in them.
When towing the little trailer, I go with about 15psi.
When I tow the jet boat, I go with about 25psi.
The little round tag on the air valve says 5psi min and 35psi max.


Our 70 with 5psi in the air shocks, and my son's 68 300, factory air, 350, M20, 3.08 posi.
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post #9 of 18 (permalink) Old Aug 12th, 19, 2:16 AM
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Re: PSI range for air shocks on a 69 2dr post

Besides Breaking the Lower shock mount, you may also "BEND" the Upper Shock Mount,(ask me how I know this) You will not enjoy the result.

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post #10 of 18 (permalink) Old Aug 12th, 19, 3:28 AM
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Re: PSI range for air shocks on a 69 2dr post

I really don’t want to sound preachy but you don’t want to use air shocks to lift the rear higher than normal ride height. They are there to decrease sagging not increase rear lift. Bad things start to happen when you do the latter.

Just say NO to this.
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post #11 of 18 (permalink) Old Aug 12th, 19, 6:31 AM Thread Starter
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Quote:
Originally Posted by Alan F View Post
I really don’t want to sound preachy but you don’t want to use air shocks to lift the rear higher than normal ride height. They are there to decrease sagging not increase rear lift. Bad things start to happen when you do the latter.

Just say NO to this.
Thanks to you and the others for your comments

My question was what’s the safe range under normal use?

I am not looking to ‘jack it up’ but when I need to go higher, under load, how high is okay and safe?

Thanks
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post #12 of 18 (permalink) Old Aug 12th, 19, 6:34 AM Thread Starter
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Quote:
Originally Posted by 68-13427 View Post
Josh, please post pics of your '69 300 deluxe. Terry
Here she is...
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post #13 of 18 (permalink) Old Aug 12th, 19, 1:58 PM
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Re: PSI range for air shocks on a 69 2dr post

Yeah, I'd agree with the majority. No matter what, keep some air in them, 15ish, just so they stay pressurized, I think it helps the seals last. And I wouldn't go over 70 unless you found documentation they are made for it. They are safe/fine/normal, GM probably sold a million cars with them stock alone. Every El Camino got them for a long time, tons more "normal" cars, tons of wagons, Monte's...
The main thing is put a bit of air in them, check headlight aim. Then use them to keep car level, if you load it up, add air to get back to level, no more. They aren't for hauling more weight, just for leveling the car after adding approved weight.
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post #14 of 18 (permalink) Old Aug 12th, 19, 3:01 PM
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Re: PSI range for air shocks on a 69 2dr post

OOR
buy some Stiffer/bigger/Thicker sized Rear Coil Springs, not Higher, so the Rearend of the Car will not sage when some weight is added
and some good comfortable riding Shocks for a smooth ride

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post #15 of 18 (permalink) Old Aug 12th, 19, 6:47 PM Thread Starter
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Quote:
Originally Posted by Pioneer4x4 View Post
Yeah, I'd agree with the majority. No matter what, keep some air in them, 15ish, just so they stay pressurized, I think it helps the seals last. And I wouldn't go over 70 unless you found documentation they are made for it. They are safe/fine/normal, GM probably sold a million cars with them stock alone. Every El Camino got them for a long time, tons more "normal" cars, tons of wagons, Monte's...
The main thing is put a bit of air in them, check headlight aim. Then use them to keep car level, if you load it up, add air to get back to level, no more. They aren't for hauling more weight, just for leveling the car after adding approved weight.
Thanks

I let the air back out when I got home from the family trip yesterday and have it back to 25psi

It sit as in the pics - perhaps a tiny bit higher in the rear - rear arch is level with tread on the 255/60 rear tyres, similar to the 235/60 on the front, which naturally means a touch lower at front end

Assume this sounds fine?
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