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  #1  
Old 05-14-2010, 11:19 PM
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Join Date: Sep 2009
Location: Northeast Vermont
Posts: 115
Transmission Knocking from 1st to 2nd

Hi all,

The automatic transmission in my 85 300td makes a knocking noise that I can feel through my seat whenever I step on the pedal hard to shift from first to second. If I gently to moderately step on the pedal when accelerating, this does not occur, and while I make it a point not to drive with the pedal to the floor, sometimes it's gotta happen. Does anyone have any insight as what might be causing this problem and any solutions?

Thanks in advance for any replies!

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1984 240D Euro 5 Speed 201,000 miles
1984 300D Euro 4 Speed (runs great but ugly)
1984 300TD 185,000 miles
1985 300TD, 240,000 miles
1972 220D, 240,000 miles w/ a stuck odometer
1984 300D, 214,000 miles
1984 300TD, 255,000 miles rustbucket parts car
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  #2  
Old 05-15-2010, 12:52 AM
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Join Date: Jan 2009
Location: Manchester,NH
Posts: 392
I would check the flex discs, and look to see if there is any play in the drive shaft. It could be that the pinion on the differential would need adjustment. Lift the car and take a look under the car.
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  #3  
Old 05-15-2010, 08:49 AM
69shovlhed's Avatar
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Join Date: Apr 2010
Location: Sterling, VA.
Posts: 286
check the center bearing in drive shaft. the rubber might be torn and dry rotten.
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1984 300TD "MAX" 303K+ still going...
fast '70 Chevelle 200k+
home built Shovelhead chopper
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  #4  
Old 05-15-2010, 09:46 AM
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Join Date: Jan 2002
Posts: 18,350
Could be that your vacuum is too low causing a very hard shift. T a vacuum gauge into the line going to the modulator run it up thru the cowl and lay the gauge outside the windshield where it is visible and go for a drive using varying pedal pressure on the accelerator to see what the vacuum levels are and how they related to the noise. I've driven a 116 where the vacuum level was so low it chirped the tires almost everytime it shifted from 1st to 2nd.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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