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  #1  
Old 04-27-2019, 11:35 PM
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Location: North Alabama, USA
Posts: 132
123 Vs 126 Shock Valving Question

Has anyone ever tried the W126 HD Bilstein Shock 24-005012 on their W123?

It’s time to replace the front shocks on my 80 300TD Wagon. I really want to tighten and firm it up.

I have settled on Bilsteins based on the many comments here on the forums.
I also learned from the forums that 126 shocks will work on a 123.

This got me to speculating that perhaps the heaver 126 body would have firmer shock valving than a 123.

As I want to firm up the ride, I will be going with one of the HD versions that Bilstein offers.

So my choices are the Heavy Duty Bilstein 24-007047 for the 123 chassis and I am considering the Heavy Duty Bilstein 24-005012 for the 126 chassis.

If anyone has any definitive information on shock valving for the 123 Vs the 126 I would be interested in that information.

Thanks!

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87 300D W124
83 240D W123
80 300 TD Wagon W123, 4 Speed from 79 240D, SLS Rear Suspension
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  #2  
Old 04-28-2019, 10:04 AM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,613
The 126 is not much heavier. I'd use the 123 shocks if they are known good, no hesitation.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #3  
Old 04-28-2019, 04:07 PM
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Thanks for the information. I thought the 126 cars were much heavier than a 123. And that lead me to speculate that the shock valving might be firmer, which is what I desire.
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87 300D W124
83 240D W123
80 300 TD Wagon W123, 4 Speed from 79 240D, SLS Rear Suspension
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  #4  
Old 04-28-2019, 04:13 PM
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Join Date: Jan 2012
Posts: 7,534
The only way to determine shock valving is to dyno the shock or at least have access to both and give them a push / tug.

Compare actual dimensions, while one shock might " fit " in the place of another, there might be length differences that could be an issue at full compression / extension. A shock with a longer extended length might bottom out / be damaged when installed on a car that needs a shorter length if a large bump is hit and suspension goes full stroke.
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  #5  
Old 04-28-2019, 05:10 PM
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Location: North Alabama, USA
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It would be great to have access to that type of equipment, but even then like you said, I would have to have both shocks available. I really wanted the sport shocks, but bilstein has discontinued them. I tried a retailer here in the states and one in the UK and got the same answer. NLA. Well they have one in inventory, but one does me no good.
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Turbo300Mercede
87 300D W124
83 240D W123
80 300 TD Wagon W123, 4 Speed from 79 240D, SLS Rear Suspension
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  #6  
Old 04-28-2019, 05:47 PM
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If you seriously want a better shock, use Koni's.
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  #7  
Old 04-28-2019, 06:04 PM
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Does this car use a stud mount upper and eyelet lower? If so , that is a reasonably common setup and you might be able to find something from another brand of car.
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  #8  
Old 04-28-2019, 07:59 PM
Diesel Preferred
 
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,788
Many who install the HD version regret it, the ride becomes really harsh. Stick with Comfort.
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  #9  
Old 04-28-2019, 09:27 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,613
I've had hd and regular and cannot tell much difference.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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