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  #1  
Old 03-09-2003, 10:15 PM
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Join Date: Feb 2002
Location: Monroeville, NJ
Posts: 93
Unhappy Serious Drivetrain Clunk

My 87 560SL has had a serious clunk in the drivetrain whenever I shift from neutral to drive or reverse. Nothing happens for about a second, then it bangs hard. Also, when the transmission downshifts as the car is slowing down, I get the same delay and clunk when I step on the gas. There is no driveshaft vibration or any other symptoms that I'm aware of.
Anybody run into this before?

Max
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M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.
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  #2  
Old 03-10-2003, 12:02 AM
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
I would speculate that you either have a very worn out front flex disc and / or broken differential mounts.

In the case of a very worn out flex disk, you want to get this looked at immediately.

If it breaks when you are on the road, you will do serious damage to the underside of your car, as it will take out your center support bearing and the drive shaft will bang against the drive shaft tunnel. Your airbag, if you have one, will also explode as the sensor for the airbag is right above the drive shaft.
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #3  
Old 03-10-2003, 07:37 PM
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Join Date: Feb 2002
Location: Monroeville, NJ
Posts: 93
Unhappy

I tend not to think its either the flex disc or the differential mounts, but I could be wrong. The reason I think this is that when I shift into gear nothing seems to happen in the transmission itself for a second or so, then it bangs into gear. Also, there is no driveshaft vibration, and the car seems to track perfectly straight. I'm afraid it might be the transmission (already had the transmission filter and fluid replaced), but don't know for sure. Maybe low pressure to the clutches? Any ideas?

Max
__________________
M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.
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  #4  
Old 03-10-2003, 11:23 PM
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Join Date: Oct 2002
Location: Colorado Springs
Posts: 481
could this be the dreaded b2 piston, although it does not usually affect reverse.
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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)

Last edited by mhingram; 03-11-2003 at 12:16 AM.
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