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Old 11-09-2021, 04:50 PM   #1
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1999 Freightliner XC Chassis front air spring replacement

Greetings All

I know that this thread is old, but just in case that there are still RV'rs still needing front air springs for the older XC chassis. I recently replaced the front air springs on my 1999 Winnebago Adventurer 34V. The OEM part number for the original air front air spring was W01-358-9586. Average price for the OEM bag is $300 per air spring.

With the OEM replacement air springs being so expensive compared to other comparable sized air springs. I decided to do some research, I found that the OEM air springs required about 95 psi to support the weight on the front axle. While this is within the capability of the air spring it is very much on the high end of the bags capability. I up-sized my replacement air springs to Firestone W01-358-8204. These springs are slightly larger, still have the internal bumper stop. The price is $150 a pair, which is half the cost of one OEM air spring. The calculated air pressure to support the front end is now 75 psi. This is right in the middle of the design range for an air spring

These new air springs ride so much better then the OEMs that I replaced. Much smoother going over road expansion joints and small pavement defects, I live in Michigan so there is no shortage of road defects.
Any Questions feel free to IM me.
Mike
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Old 11-09-2021, 06:10 PM   #2
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Welcome to the group and thanks for sharing your information.
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Old 11-24-2021, 12:47 PM   #3
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Great info. I have a 2002 Fleetwood Expedition on an XC chassis that also utilize the W01-358-9586 front air bags. Did you install these yourself or have a shop do it. Did the 8204's bolt right into place without having to mod anything?
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Old 11-24-2021, 06:22 PM   #4
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Great info. Just checked my PN on DTNA connect. It is 90557221 which is equal to Firestone ..9586.


Would like to know more about installation. DTNA has a replacement procedure but would like to hear it firsthand from someone that has done it.


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Old 11-25-2021, 02:57 AM   #5
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Itís been a couple of years since I replaced the front bags on my 2001 Freightliner XC but I donít remember anything out of the ordinary. Just soak everything in your favorite penetrating oil the day before you attack it.

My bags were still working but the 20 year old rubber had severe cracking and Iíd rather replace them at my leisure in my driveway than pay someone on the side of the road.
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Old 11-25-2021, 08:37 AM   #6
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Quote:
Originally Posted by JNSNWT View Post
Itís been a couple of years since I replaced the front bags on my 2001 Freightliner XC but I donít remember anything out of the ordinary. Just soak everything in your favorite penetrating oil the day before you attack it.

My bags were still working but the 20 year old rubber had severe cracking and Iíd rather replace them at my leisure in my driveway than pay someone on the side of the road.

Good info. If I replace mine I will start by using the DTNA procedure. Did you have to do anything different? Anything to watch out for?
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Old 11-25-2021, 09:42 AM   #7
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Yes. I did the work myself. Direct fit no mods. Lower air bag mounting bolt is 1/2 inch instead of 3/4 inch like the original, so you will need a good hardened 1/2 inch washer.

Jack the front jaacks all the way up, remove wheel and disconnect level control valve linkage on the side your working on. You do not need to disconnect shock. JPut jack stand or block the chassis so that you are save. You will need to drop the front axle, (one side at a time) to access the bottom mounting bolt.
You will need a good breaker bar 3 foot plus. To break the axle mounting bolts loose.
All in all if you have the tools and some mechanical skills it takes about 1 hour per bag.
While your there and the wheels are off, don't forget to check out your front brakes. And check that the clevis pins on the S cam slack adjusters are free, they like to rust from sitting.

Good luck and don't forget to re-tighten the wheel lug nuts and the front I beam mounting nuts after 100 miles or so.
Mike
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Old 11-26-2021, 09:19 AM   #8
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Quote:
Originally Posted by mhowie969 View Post
Yes. I did the work myself. Direct fit no mods. Lower air bag mounting bolt is 1/2 inch instead of 3/4 inch like the original, so you will need a good hardened 1/2 inch washer.

Jack the front jaacks all the way up, remove wheel and disconnect level control valve linkage on the side your working on. You do not need to disconnect shock. JPut jack stand or block the chassis so that you are save. You will need to drop the front axle, (one side at a time) to access the bottom mounting bolt.
You will need a good breaker bar 3 foot plus. To break the axle mounting bolts loose.
All in all if you have the tools and some mechanical skills it takes about 1 hour per bag.
While your there and the wheels are off, don't forget to check out your front brakes. And check that the clevis pins on the S cam slack adjusters are free, they like to rust from sitting.

Good luck and don't forget to re-tighten the wheel lug nuts and the front I beam mounting nuts after 100 miles or so.
Mike

Thank you!
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