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#1
09-23-2008, 01:17 PM
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Transmission mount......................I hope
Out of the blue yesterday I noticed a substantial vibration coming from what seems like somewhere right under my arm rest. This vibration occurs right after it goes into 2nd gear and right after it goes into 3rd and only lasts for about a second or 2 then stops and doesn't happen again until I come to a stop/slow to a crawl and then accelerate.There is no vibration when down shifting. The vibration is like somebody is under my car and hitting the floor with a hammer(thump thump thump thump thump). Prior to this event the transmission has been a non issue, fluid is at the correct level and it shifts just fine. Like I said at the begining of this post, this just started without warning. Where do I start?
Thanks in advance!!
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Rich B 1983 300D Turbo 205k Excuses are crutches for the weak 
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#4
09-24-2008, 07:45 AM
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Quote:
Get under and have a looksee, it most likely will show itself if you start wiggling the driveshaft.
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81 Mercedes 300SD 289k.......SOLD 82 Mercedes 300CD 252k......slow ride 82 mercedes 300 SD...mi Unknown 83 Mercedes 300D ????ksniff..gone too 84 Mercedes 300D 148k........SOLD 85 Mercedes 300TD 386k and holding some one elses project
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#5
09-24-2008, 03:49 PM
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I 2nd carrier bearing
Get under there and look at where the driveshaft goes thru a hole before the rear diff. Grab the driveshaft and yank hard. If there is movement, the carrier brating is toast.
I had this issue when I first purchased my car, every shift the driveshaft whould smack the undercarrige of the car like crazy, esp. downshifting. I'd investigate the flex disk also. I know that there is a transmission mount but I still have yet to find and replace mine.
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1984 300D
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#6
09-25-2008, 06:46 AM
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Same thing happened to me last year....center driveshaft support bearing.
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'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R
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#8
09-25-2008, 04:23 PM
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No
(If it's your CSB) This be the culprit:
[Per A.D.] Also when you replace this BEFORE: 1.You tighten the center nut on the Driveshaft. AND 2.You torque the two bolts that secure the center support to the body. ROLL the Chassis "back and forth" 10-20 feet to allow the Driveshaft to "Set" itself.(Else you'll shorten the CS Bearing and Flex Discs use-able lifespan)
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'84 300SD sold 124.128 Last edited by compress ignite; 09-25-2008 at 04:29 PM.
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1981 300SD 512k OM603 
Linear Mode
