Question about 1995 Mercedes-Benz C-Class

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I have a "clunk" when the transmissions shifts gears. Other than that the car runs great. I just bought it and it also has a little "drag" when in reverse.

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First start the engine and leave it in park and then check the level of transmission fluid on the dip stick (on the left at the very back of the engine). Second check the integrity of the bolts holding the differential to the rear subframe. There are only three, two to the rear of the diff. in rubber mounted bushes and one on the left front vertically into a rubber cushioned washer mounting. Third check the rubber flexible (dounut) assemblies immediately to the rear of the transmission output and in front of the differential input. The 6 bolts on each should be secure and there should be no cracks in the couplings. If they show signs of deterioration they are easy to replace.

Posted on Aug 29, 2010

  • 1 more comment 
  • Joseph Prosser Aug 29, 2010

    Use Shell Donax TX transmision fluid and top up, a pint at a time, via the transmission dip stick tube

  • spencer_inch
    spencer_inch Jan 22, 2012

    I have a 95 c280 and i also have this clunk every-time the trans shifts gears. Ive replaced the flex disc and also the diff fluid. i was about to replace the center support bearing thinking that that may help. Ive had this problem since i had the car. Now i work in the automotive field and had got some opinions on this issue. some say replace the diff or it could be the diff pinion bearing. i need a good solid answer and thought you would be able to help. this issue is very annoying and before i make any purchases, i would need a professional opinion.PLEASE HELP ME....

  • Joseph Prosser Feb 23, 2012

    Two types of clonk. On is external due to slackness in the drive train or the mountings and the other is internal due to slow gear engagement. The latter is very often due to low fluid; there is simply not enough fluid to fill the impeller housing/ torque converter quickly and as a result the engine revs up just an instant before the gear engages and so a sudden ****** is heard and felt (clonk). If this continues the input shaft from the torque converter will eventually shear off. There is also another possible cause and that is one of the solenoid switches/valves within the gear box is no longer functioning. OK drain a little 1/4 cap is enough from the transmission bottom drain plug. Is it clear and pink? If so OK. If opaque and grey brown and smells a burnt then it needs a complete change. Allow the fluid to sit for about an hour and pour it out very slowly. Is there grey sludge at the bottom of the cup? Are there identifiable gritty metal bits in it? If so then this indicates significant gear box bearing wear and may need replacement. If no sludge then simply change the transmission fluid filter (inside the the gear box) and completely flush with new fluid. If all fluids are OK and all drive train links and mounts are firm then I would find an autotransmission specialist to check the correct operation of the solenoids.
    With regards to differentials they do not normally clonk internally , they usually whine for a long time before they would get to the point of clonking. Autotransmissions are very good at avoiding putting ****** loads through to the diffs and so difs in automatic vehicles survive a long time

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