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  #1  
Old 02-13-2012, 12:03 PM
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w126 shocks and springs

I have had it with the rear end sag and i am currently pricing parts. my question is what should i replace as far as rubber bits. Also what combination do i do.
i was thinking for the rear, HD Springs and shocks and just regular bilstein shocks for the front and not messing with the springs up front.

any suggestions and what others have done? success? failures?

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  #2  
Old 02-13-2012, 12:52 PM
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I just posted this in another context. Have you checked the rear subframe bushings?

Sixto
87 300D
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  #3  
Old 02-13-2012, 12:59 PM
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Quote:
Originally Posted by oldtown View Post
I have had it with the rear end sag and i am currently pricing parts. my question is what should i replace as far as rubber bits. Also what combination do i do.
i was thinking for the rear, HD Springs and shocks and just regular bilstein shocks for the front and not messing with the springs up front.

any suggestions and what others have done? success? failures?

I've spent quite a bit of time with the ride height of the W126. The approach that I took with the SD differed from the approach with the SDL.

To get the ride height back to perfection with the SDL required a set of new springs. However, after purchasing the stock springs, I find that the vehicle still sat low in the rear with any load whatsoever in fuel or in baggage. To get the proper height required some custom springs with an additional 5/8" length. The vehicle now sits a tad high in the rear with no weight. I might lower it slightly with thinner pads.

The SD was quite successful by using the stock springs. The diff mount was replaced and the spring pads were replaced to the maximum thickness three nub pads. The main success on the SD was accomplished by replacing the front spring pads with the very thinnest possible one nub pads. This cured the high front end look and simultaneously raised the rear slightly. The vehicle sits perfectly now...........just slightly high in the rear with no weight and dead level with full fuel and about 50 lb. in the trunk.

So, before you waste a bunch of money on springs, determine if a change of pads and the replacement of the diff mount will cure your problem.
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  #4  
Old 02-13-2012, 06:04 PM
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Quote:
Originally Posted by Brian Carlton View Post
I've spent quite a bit of time with the ride height of the W126. The approach that I took with the SD differed from the approach with the SDL.

To get the ride height back to perfection with the SDL required a set of new springs. However, after purchasing the stock springs, I find that the vehicle still sat low in the rear with any load whatsoever in fuel or in baggage. To get the proper height required some custom springs with an additional 5/8" length. The vehicle now sits a tad high in the rear with no weight. I might lower it slightly with thinner pads.

The SD was quite successful by using the stock springs. The diff mount was replaced and the spring pads were replaced to the maximum thickness three nub pads. The main success on the SD was accomplished by replacing the front spring pads with the very thinnest possible one nub pads. This cured the high front end look and simultaneously raised the rear slightly. The vehicle sits perfectly now...........just slightly high in the rear with no weight and dead level with full fuel and about 50 lb. in the trunk.

So, before you waste a bunch of money on springs, determine if a change of pads and the replacement of the diff mount will cure your problem.
Brain
thanks for the information, the diff mount has been replaced. no noticeable difference. very interesting about the pads, i will give it a try. Should i go with the HD Shocks on the front and rear or just rear? what about the koni shocks?
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  #5  
Old 02-14-2012, 12:33 AM
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Originally Posted by oldtown View Post
Brain
thanks for the information, the diff mount has been replaced. no noticeable difference. very interesting about the pads, i will give it a try. Should i go with the HD Shocks on the front and rear or just rear? what about the koni shocks?
I'm not a champion of "HD" shocks on the W126. The ride is mediocre at best and the slight handling advantage of the HD shocks isn't worth the beating that you'll take on a daily basis.

No experience with Koni. Bilstein usually gets the nod here.
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  #6  
Old 02-14-2012, 12:59 AM
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To "lift" my rear end on my 420SEL, I replaced:

Springs - stock OE
Spring pads - stock (can't remember which nub off the top of my head) OE
Subframe bushings - stock OE
Trailing arm bushings - stock OE
Diff mount - stock OE
Shocks - Bilstien Comfort

By doing this, I gained just under 2" of ride height in the rear.
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  #7  
Old 02-14-2012, 09:36 AM
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Ride height

My 85 300SD sagged in the rear also. I put H.D. springs + H.D. Bilsteins and with a lot of weight in it still sags more then I would like and the wheels sit like this / \ . My next step will be to either put some kind of shim under the spring or would really like to custom fit some air shocks on it so I could put the height wherever I need it. Really fed up with this sagging also.
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  #8  
Old 02-14-2012, 09:42 AM
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air shocks

I heard a 69 firebird air shock will fit our cars
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  #9  
Old 02-14-2012, 10:26 AM
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SLS...
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  #10  
Old 07-25-2012, 11:35 AM
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bilstein shock part number - 1984 300SD front shocks

For a 1984 300SD would the part number for the front Bilstein shocks be Part Number: W0133-1910719? Fastlane has them for approx $65/ea...

These are OEM, correct?

Thanks ya'll!
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  #11  
Old 07-25-2012, 12:53 PM
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A 1984 300SD would more likely have Boge or Sachs shocks than Bilstein as OE. The Worldpac part number I see on Fastlane for Bilstein comfort front shocks for that car is W0133-1910423.

Bilstein offers comfort/touring (24-011839), heavy duty (24-005012) and performance/lowered shocks (24-015356) front shocks for that car.

Sixto
87 300D^2
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  #12  
Old 12-01-2012, 01:54 PM
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rear end sag solution

To eliminate rear end sag you must change your Differential Mount AND Subframe Bushings (the two very large round ones).

This is going to sound snooty but forgive me:

The w126 subframe architecture is such that the diff mount and subframe bushings work IN CONJUNCTION with eachother to create a positive-camber platform. If any of those 3 rubber bits weakens or fails, the leveraging effect of the system fails, you lose camber, undue force is put on the springs, and the car saggs.

Also, asymetrical rear end sagging is almost always due to asymetry within the system (i.e. One subframe bushing is bad)

Only after this subframe system fails does excessive pressure begin to be placed on the shocks and springs, leading to their loss of strength, thus exaserbating the sagging further.
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  #13  
Old 12-01-2012, 03:29 PM
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Quote:
Originally Posted by oldtown View Post
any suggestions and what others have done?
I run my SDL on VO. When the 2nd tank is full, that is 175lbs in the trunk. When I take a road trip I start off with about 500lbs of extra fuel plus luggage.

I got spring helpers. They are the kind that screw into the spring with a 1/2" drive on an extension and a breaker bar. The one's I get are marketed for the front springs for a pick-up ( the rear one's are too big ). They cost about $10. They take just a few minutes to install.

They may not work for you. Others will be aghast at such an idea. For $10, it just might be worth a try.

No sag. No noticeable degradation of the ride. 50k on the SDL, 130k on the W210 with no problems.



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1986 300SDL 237k, 25k on WVO (Deerslayer)
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1983 380 SEC w/603 diesel, 8k on WVO
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  #14  
Old 12-01-2012, 03:38 PM
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Quote:
Originally Posted by qpooqpoo View Post
The w126 subframe architecture is such that the diff mount and subframe bushings work IN CONJUNCTION with eachother to create a positive-camber platform. If any of those 3 rubber bits weakens or fails, the leveraging effect of the system fails, you lose camber, undue force is put on the springs, and the car saggs.
While I am in agreement with the three point support that provides the basis for the subframe support and the ultimate ride height, I disagree with the premise that the subframe bushings are going to effect a significant difference.

The reason is as follows:

1) The rubber in the subframe bushing can collapse fully and the body of the vehicle will fall not more than 1/2". This is if the bushing fully collapses and disintegrates which for most folks hasn't happened yet.. If this does occur, the geometry might allow the body to fall a maximum of 3/4".


While it would be desirable to recover that 3/4", most vehicles won't benefit by more than 3/8" when the subframe bushings are replaced. My previous experience with the SDL shows that you can spend your money elsewhere (spring pads, differential mount, shocks) for more gain.

Installing new Bilstein shocks gave the SD an additional 1/2" just from the proper gas pressure.
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  #15  
Old 12-01-2012, 09:32 PM
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Bags. If I get a nicer 300sd I'm putting it on bags.

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