Hi, My 300SD, Has a cluncking (popping) sound coming from the right front end, you can feel it on the floor board. Funny thing it seems non existent when cold outside to very annoying or bad when the outside air temperature increases. anyway.. took the car to a mechanic, small shop where I have had good dealings in the past.. he took a device to listen to the control arms and said it was the upper control arm. He took the right side apart and found all the bushings to be in great shape. and could not find any other problems... the car still makes the same sounds... He told me basically nothing was wrong nothing to worry about... the problem is terribly to me... obviously Im not going back to him... Anyone have any simular problems with the front end noise or advise on DIY correction.. I think I will try to invest some time to fix what ever is wrong myself...


thanks Joe..

Please tell us where you are in the world.
Also, describe the conditions under which this sound/feeling occurs.
Turning ? - Left or Right ?
Speed , when slowing or accelerating ?
How many miles on vehicle ?

Some of these threads suggest recording the sound and posting that too.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250

do a search on guide rod mounts

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have no worries.....President Obama swears "If you like your gun, you can keep it

Im in Denver Colorado....It seems worse when its Cold... It does not matter if im in a turn or not...It will happen when I hit any bump, or the front end goes up or down...

You say maybe, guide rods the mechanic didnt even mention that.. I will have to read up, I know nothing about them.. easy to DIY????

Joe, MBZ front suspension has some odd (different from most eveything else, engineering). I would have someone look at it, that's a bit more familiar with these cars.

There is a heavy rod that goes from the lower end of the hub (near where the lower ball joint is located) back to the frame. Essentially the lower firewall. There is a bracket there that holds the "guide rod mount". It is a small version of a ball joint. You can visually inspect the dust boot on this thing, and if the dust boot is broken you can bet this is making the noise.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

i would actully have somone pull it forward and hit the brakes and watch to see if the wheel moves alot or not.

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have no worries.....President Obama swears "If you like your gun, you can keep it

I can recommend German Motors to you.

He knows this car very well...sorry I don't know his name off hand.


German Motors Inc
1360 South Simms Street, Denver, CO 80232
(303) 237-6021

There is a lady there that knows MBZ quite well also.

I just did my guide rod mounts. Solved my clunk-rattle problem. Wasn't alot of play in them but they sure made some noise.

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83 300SD
3 fords