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Old 09-06-2010, 09:09 AM
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Join Date: Jul 2008
Location: nashville, tn
Posts: 36
85 300DT rough idle/vibration in Park & Reverse

Noticed vibration when in Park & Reverse, but drives smooth otherwise, all the mounts seem fine....transmission?

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Old 09-06-2010, 09:25 AM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,385
Seem and are, definitely have different definitions.
however, there are in addition to the mounts, shocks, with their mounts. also, the air cleaner has several mounts that are notorious for failure, also there is a drain tube below the air cleaner that will rattle a lot, and dump oil everywhere. also, the transmission has a mount, and it will allow the exhaust down pipe to hit the body...
let the hunt begin!
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
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My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
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Old 09-06-2010, 10:11 AM
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Join Date: Jul 2008
Location: nashville, tn
Posts: 36
thanks for the info

the mount beneath the air filter housing is broken, I rigged it with an L-bracket for now, will check on the drain tube, the bushing within the driveshaft support seems a little hard & loose, could this cause the shaking in park & reverse?
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Old 09-06-2010, 10:12 AM
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Join Date: Sep 2006
Posts: 34
Yup. Check those two areas as I have had the same exact symptoms on my 82' 300TD and they were the culprits!
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Old 09-07-2010, 11:28 PM
eatlead's Avatar
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Join Date: Jul 2009
Posts: 26
it happened to our 300SD once...for us, it was a failed/broken "engine-shock" bottoming out on one side...check your engine shocks.

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