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  #1  
Old 09-20-2010, 10:21 PM
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123 rear air shocks ?

Wondering if anyone has successfully added air shocks to a 80ish 300d and would like to share the type and part #'s. Have a small trailer that makes the rearend sit a little down. Thinking that some air shocks would level it out. I've searched and it seems that there is not too much info. I think I've found some Monroe's that might fit. Somebody has to be towing with their 300d's.
Thanx Jimmy
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  #2  
Old 09-21-2010, 04:45 AM
Stretch's Avatar
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I'm not towing with my 300D, but I've recently replaced my shocks. The advice here was Bilstein HDs all round. That's what I've done.

However, if ride height is a problem then you need to consider rear sub frame bushings, the rear diff mount, trailing arm bushings and the rubber shims fitted above the springs.

You can also do a search - on this forum - to find more information regarding spring stiffnesses and lengths. Most of the technical specs have been published here.
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!

Don't leave that there - I'll take it to bits!
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  #3  
Old 09-22-2010, 07:18 AM
oldsinner111's Avatar
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I've heard that a 1969 Pontiac Firebird gabriel air shock will fit our cars(w123 and w126).Compare air shock to factory shock.
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  #4  
Old 09-22-2010, 10:34 PM
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Thanx thats the info I was lookin for. Need an easy fix. Wish I had the time and $ to rebuild the whole suspension.
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  #5  
Old 09-23-2010, 04:14 AM
Stretch's Avatar
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Easy fix eh?

Over here (Europe - in particular Holland) they sell additional springs that attach to the side of the existing suspension. In Dutch they are called "hulpveren"

See

http://www.mobilityparts.nl/catalog/index.php?cPath=24&osCsid=kgq9ml7hj4267fno7b7oc8lgb5

or

http://auto-onderdelen.marktplaats.nl/mercedes-benz-onderdelen/154843362-hulpveren-mercedes-w201-w202-w123-w210-w108-w109-w126-w140.html
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!

Don't leave that there - I'll take it to bits!

Last edited by Stretch; 09-23-2010 at 04:15 AM. Reason: making it clearer
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  #6  
Old 09-23-2010, 08:17 PM
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Anyone have a source for these in the USA? Tried searching came up with euro only.
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  #7  
Old 08-13-2012, 10:43 PM
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wenchris..

Did you end up going with the air shocks?? If so, did the 69 firebird ones fit??
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Agnes (the Limo) '84 300SD
Pearl (the Taxi) '81 240D (preparing for the 'afterlife')
Bridgette (baby girl) '82 VW Pickup-- currently getting readied for her rebuilt (overbored) engine.
1 VW 1.6 NA diesel **not installed in vehicle**
Gidget (the bimbo) '87 VW Cabriolet-- the diesel engine it above is eventually going there!

and a BMW Motorcycle. (1998 R1200C)

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  #8  
Old 08-16-2012, 10:43 PM
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Were the air shocks a fit?
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1982 240d 4-speed 210k daily driver...
06 Jetta TDI DSG 150k
1997 Ford F150 230k miles 4.2L V6 "Work Truck"
1980 Honda CB900c, 1986 Kawasaki Voyager
1984 300D...Totaled OUCH!
1985 300D Turbo 222k miles "Dos" sold to 79Mercy
1986 300SDL 98K miles "The Beater"....sold
1987 190E 2.3 16v Euro spec 115K miles....sold
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  #9  
Old 08-16-2012, 10:48 PM
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It may be irrelevant to me..

I've got a 126.. ('84 300SD)
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Agnes (the Limo) '84 300SD
Pearl (the Taxi) '81 240D (preparing for the 'afterlife')
Bridgette (baby girl) '82 VW Pickup-- currently getting readied for her rebuilt (overbored) engine.
1 VW 1.6 NA diesel **not installed in vehicle**
Gidget (the bimbo) '87 VW Cabriolet-- the diesel engine it above is eventually going there!

and a BMW Motorcycle. (1998 R1200C)

Did I mention I'm of German Heritage??
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  #10  
Old 08-17-2012, 06:13 AM
t walgamuth's Avatar
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The rear shocks are interchangible from 123 and 126 I believe. the air shocks will ruin the ride of a benz I suspect.

Unless the rear is really sagged I would just let it sit down a bit and allow the suspension to do its job. You may be able to redistribute your load in the trailer a bit to lighten the tongue load.

These cars are designed to handle a load. You won't hurt them as long as you follow the guidelines in the owners manual.
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  #11  
Old 08-17-2012, 08:27 AM
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I lifted my rear the cheap way,with spring spreaders,you use a wrench.Also jacked rear end (not mount) and slipped hard rubber under neath rear end,between mount and rear end.Then let it down.Gave me about a inch and a halft lift and no settling when loaded.
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  #12  
Old 08-17-2012, 01:42 PM
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Quote:
Originally Posted by t walgamuth View Post
The rear shocks are interchangible from 123 and 126 I believe. the air shocks will ruin the ride of a benz I suspect.

Unless the rear is really sagged I would just let it sit down a bit and allow the suspension to do its job. You may be able to redistribute your load in the trailer a bit to lighten the tongue load.

These cars are designed to handle a load. You won't hurt them as long as you follow the guidelines in the owners manual.
I always agree with Buddy Tom on things Mercedes. The suspension is really hard to improve on, but a lot of miles do get it tired. If you like your car you have to keep it up. If you don't it will soon find it's way to the P&P. My suspension was obviously tired. Looked like all it it went close to 250,000 highway miles. So I replaced all of it, springs, shocks and bushings in the rear. Total cost about $600.00, including labor at a small shop. It can all be done by an owner who is willing to "get it done", in about a day with a couple of rental tools, his own hand tools, a good working attitude and less then $300.00 in parts.
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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
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  #13  
Old 08-17-2012, 02:16 PM
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I adapted some airbags from jcwhittney for my 1999 Toyota truck. They were in addition to the factory shocks and placed on the leaf spring. When aired up they helped level the truck when loaded. And when unloaded, I just let most of the air out bringing it back to the factory ride. They worked great in that application. I understand that the w123 has coil springs not leaf springs. Not sure if there is any clearance under it for this type of mounting?

I am also looking for solutions for my 240d. I'm building a hitch so I can pull my 5x8 utility trailer & my 28' travel trailer(just joking about the travel trailer!!)
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1982 240d 4-speed 210k daily driver...
06 Jetta TDI DSG 150k
1997 Ford F150 230k miles 4.2L V6 "Work Truck"
1980 Honda CB900c, 1986 Kawasaki Voyager
1984 300D...Totaled OUCH!
1985 300D Turbo 222k miles "Dos" sold to 79Mercy
1986 300SDL 98K miles "The Beater"....sold
1987 190E 2.3 16v Euro spec 115K miles....sold
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  #14  
Old 08-17-2012, 11:40 PM
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I think the rear suspension may well be "tired.." I agree, the suspension can probably not be improved.. That 4500 pound monster handles surprisingly well, even at her advanced age..

I've had air shocks on the back of my Ranchero since the mid 90's, replacing a set that failed. Yup, they are harsh, "aired up..."

My logic was that, in doing that-- I wouldn't have to affect it much, until I needed the additional "lift.."

Wish it was a dual shock setup, or there was a way to do "accessory air bags.."

I've yet to see a w126 that didn't look "low" in the back.. Not sure what the "stock" ride height was/is.. I'd considered the spring helpers.. I guess I could "wrench those up" when needed.

The shocks need replaced, I'm certain, just wondering what anyone else has done..
__________________
Agnes (the Limo) '84 300SD
Pearl (the Taxi) '81 240D (preparing for the 'afterlife')
Bridgette (baby girl) '82 VW Pickup-- currently getting readied for her rebuilt (overbored) engine.
1 VW 1.6 NA diesel **not installed in vehicle**
Gidget (the bimbo) '87 VW Cabriolet-- the diesel engine it above is eventually going there!

and a BMW Motorcycle. (1998 R1200C)

Did I mention I'm of German Heritage??
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