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  #1  
Old 01-28-2008, 01:57 AM
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driveshaft clunk in park and neutral

I have a 1984 300d. When the car was idling in park or neutral I could hear something clunking under the car. When I looked under the car the clunking was the driveshaft turning back and forth. It doesn't do this in drive or reverse. What could cause this?

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Old 01-28-2008, 01:59 AM
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torque convertor or flex disc. check the flex disc.
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Old 01-28-2008, 02:11 AM
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the drive shaft will move slightly in neutral or park due to fluid pressure in the transmission......if on a slight incline in park it won't happen. Mine does it too and I have brand new flex discs.......if yours are old do check them, but the "clunk" is normal if sitting on perfectly level ground.
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Old 01-28-2008, 02:25 AM
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Quote:
Originally Posted by pawoSD View Post
the drive shaft will move slightly in neutral or park due to fluid pressure in the transmission......if on a slight incline in park it won't happen. Mine does it too and I have brand new flex discs.......if yours are old do check them, but the "clunk" is normal if sitting on perfectly level ground.
yah but he said it did it in park and doesn't the tranny disengage.
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Old 01-28-2008, 02:59 AM
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Dieselsüchtiger
 
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Quote:
Originally Posted by BoomInTheTrunk View Post
yah but he said it did it in park and doesn't the tranny disengage.
technically its "disengaged" in park or neutral but there is still fluid pressure inside the tranny that will transmit a very small amount of power through the shaft....not enough to actually do anything or move the car (it might move slightly in neutral if you rev the engine up a bit) but still a little bit. In park the parking lock holds it from turning more than 1/3 rotation or so, but I bet in neutral with a rear wheel off the ground it would spin at low speed.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 90k - mine - (OC-91,200)
'17 Metris(VITO!) - 18k - wifes (OC-25k)
'01 E320 Wagon - 161k - mine (OC-165,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 134k - dad's (OC-139,500)
'01 SL500 - 56k - dad's (OC-59,000)
'16 E400 4matic Sedan - 81k - Brothers (OC-88,000)
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