DJ Turbo.

Impressive research I must say!

j_martin

Why does the box say, "gas charged"?

Jim Lane

Yes,
I saw that too, but I can tell you they are NOT gas charged, whatever position you pull the shock to, it stays there, just a lot of resistance, but no extension.

See how the shocks remain compressed without being restrained.



In the documentation, it is listed as Cellular Gas Design whatever that is

PRO COMP ES3000 TWIN TUBE GAS SHOCK Superior Control: The Pro Comp ES3000 employs twin tube hydraulics for unbelievable driving comfort, while 10-stage velocity sensitive valving allows the Pro Comp ES3000 to self-adjust to driving speed and conditions Cellular Gas Design: These Pro Comp Shock Absorbers incorporate cellular gas insert to the reduce aeration and foamingSuperior Control: 10-stage ve locity sensitive valving allows the Pro Comp ES3000 to self-adjust to driving speed and conditionsHeavy Duty Durability: The 1 3/8"" nylon banded piston rod and 5/8"" chrome hardened piston rod construction gives these Pro Comp Shock Absorbers ultimate strength and longevityPro Comp Suspension Lifetime Guarantee: As with all ES series Pro Comp Shock Absorbers, the Pro Comp ES3000 is backed by a Lifetime Guarantee against manufacturer defects and workmanshipWhat it has: The unique engineering of the twin tube cellular gas design gives these Pro Comp Shock Absorbers markedly improved driving comfort and performance. The 10-stage velocity sensitive valving of the Pro Comp ES3000 allows it to self-adjust to adapt to speed and road conditions to improve handling. A 5/8"" chorme hardened piston rod and Teflon rebound stop ensure smooth highway driving and dependable off-road handling. Double welded shock mounts for maximum strength, making these Pro Comp Shock Absorbers one of the strongest and most durable on the market.

You were wondering about what shock fits what vehicle, this lets you select the amount of lift after the base shock is selected.

http://www.procompusa.com/productlis...t=90&ptid=3306

Jim

Jim Lane

Ahha, I found proof to support my therory
I really knew this all along, just could not find the shocks to prove it.



Jim

j_martin

Seem I remember shocks when I was younger would compress rather easily, but have more resistance when extending. The car would actually ride a bit lower to the ground on a rough road.

bobva

Two years ago when I replaced the front springs it lifted it up 2 inches. My old monroe shocks didnt fit the lift.

So began my shock hunt.
bilsteins did not fit my truck bushing ID was the wrong size. took them back to the store also a 4wheelparts. No problem and very helpfull. The counter guy also looked at the PC 3000 they also did not fit my truck. Bushing ID was wrong.

Jim what is ID of the bushing on your rears.

My truck is a 93 w250 and the bushing ID is 11/16.

Myself personally I would much rather have a full set of old school oil shocks.

Jim Lane

I went out and checked the old gas shocks that I took off,
Upper = 1/2"
Lower = 11/16"
Extended Length 24-1/2" center/center.

I also would rather have Hydraulic than Gas shocks any day

Jim Lane

Mr j_Martin,

I had asked the same question of the counter person, he did not know but from reading all of the documentation it claims to be of a Cellular Gas Design, probably part of a trade name.

So since I had nothing to do for about 5 minuets I sent an e-mail to the Tech Support asking the same question just to satisfy my curiosity.


The following person filled out the contact form on www.ProCompUSA.com:
Name: Jim Lane
Phone Number:
Email Address: removed@verizon.net
Dealer or Retail Customer? Retail
Message: I have recently purchased a set of 4 shocks for my 1991 Dodge D-350
Dually from 4-Wheel Parts.
Can you tell me if the ProComp #315517 ES3000 Shock and the ProComp #324509
ES3000 Shock is a Hydraulic or a Gas shock?
Why does it state Cellular Gas Charged on the box, and what is cellular gas
design?
I am very satisfied with the ride.
Thank You Jim

Hello Jim,

The es3000 shocks are Hydraulic fluid based. They are also cellular
(internal design type)

http://www.procompusa.com/productlis...subcat=90&ptid
=3306
Thank you,

NE frmhnd

Those pro comp's aren't too badly priced, either.
The shocks I took off my truck were blued, too. I bet the ones on it are as well.

bobva

Thanks Jim

I just done a bunch of readings like http://www.therangerstation.com/tech...t_Shocks.shtml plus many others.

Im now convinced that Cellular Gas, Cellular Foam, Twin tube is the new word for hydraulic shocks.

From the part#s you gave http://www.summitracing.com/parts/exp-324509 Are these the rear shocks ?

Your bushing ID of measurement of 11/16 on the bottom tells me something should fit my truck my front shocks mount REQ 11/16 ID bushings top and bottom.

Ive been needing new rear shocks for so Ill check in to these.


http://www.procompusa.com/productlis...t=90&ptid=3306

bobva

Thanks Jim
After doing a ton more reading I am now 100% convinced Twin Tube is the new word for hydraulic shocks.

paste % copy

Hydro shocks from Skyjacker are designed to adjust automatically to any on or off-road conditions. They feature hydraulic-action, twin-tube construction and multi-stage, velocity-sensitive valving.

Jim Lane

Wow,
I think we might just have discovered the reason that all of the 1st Gen Dodge Rams had such a terrible ride, the market was just flooded with the new fangled Gas Shock and everyone was convinced by the media that they must have them if they had a truck.

I know from personal experience that as soon as I installed mine when I first got my truck that it destroyed the quality of my ride, it was harsh and my teeth rattled with every bump I hit.

The shocks came with a bag of various rubber bushings and sleeves to fit different applications so I could see the rear fitting the front by using different bushings as long as the valving was correct.

I am not saying that my truck rides like a Mercedes but it dose ride so much better than it did before and it is a lot quieter inside than it was with the gas shocks
Also the price is not bad for these, under $200.00 to make your truck ride better, that is not even 1 tank of fuel.

Jim

Jim Lane

Brand: Pro Comp Suspension Systems
Manufacturer's Part Number: 324509
Part Type: Shocks and Struts
Product Line: Pro Comp ES3000 Shocks Summit Racing
Part Number: EXP-324509

UPC: 614901041972
Internal Design: Twin-tube
Adjustable: No
Gas Charged: Yes
Extended Length (in): 24.840 in.
Collapsed Length (in): 14.820 in.
Bushing Material: Rubber
Bushing Color: Black
Boot Included: No
Body Diameter (in): 2.360 in.
Upper Mount: Eyelet
Lower Mount: Eyelet
Quantity: Sold individually.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.
These Pro Comp ES3000 shocks have an expanded, gas-cell-charged, twin-tube design.
This increases fluid capacity by 50 percent, reducing internal operating temperatures, while protecting vital components.
Other features include 10-stage, velocity-sensitive valving and a 1 3/8 in. full displacement.
The ES3000 shocks are available for both stock-height and lifted suspensions.

If there is a gas charge anywhere in this shock it is not of the conventional type, this is just a hydraulic damper, the extended shock stays wherever you leave it.

Jim

bobva

Woops did more reading twin tube is not the new word hydraulic shocks.

PapeCAT

On my 1991, the OEM factory original shocks are gas charged. but with my 1973, which I am 2nd owner and am pretty sure has the original shocks as well and look 40 years old, are Hydraulic. But I must say, that the OEM gas shocks on the 1991 are much smaller diameter than the aftermarket Monroe Gas Magnum, or Gas Grande sold at napa. The OEM gas shocks seem to have much less "gas" charge/spring than the monroe as well.