'82 300TD - Page 2 - Mercedes-Benz Forum

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post #11 of 16 (permalink) Old 07-05-2009, 09:28 PM
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Herky jerky

Let me tell you my experiences. If you get a 123 or 126 that shifts smooth, go buy a lottery ticket cause this is your lucky day! I own 10 diesels right now, and work on them regularly. The harsh shifting is the most complaint I get. There are things to do to make them shift smooth, but you have to do a trial and error. I suggest you find a older MB mechanic and have him look at yours.
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post #12 of 16 (permalink) Old 07-05-2009, 10:24 PM Thread Starter
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Thanks again all for your expedited responses! I will ask 2 more questions, then let this poor horse die... Will Bowden cables and transmission modulators be part of this issue? And I have been told that the torque converter rebuild is paramount at the same time as the transmission....especially after 200k+ miles...any truth to any of these opinions?
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post #13 of 16 (permalink) Old 07-07-2009, 09:56 PM
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The modulators and the bowden cable does have a large part in the shifting pattern. IF you get them adjusted properly your car will or should shift as smooth as silk. It is a hit and miss to get them adjusted. I would start looking at the valves on top of the valve cover. I see them all the time with worn places that will make the car shift hard. Replace the ones that are worn and see if that helps. Usualy a easy fix.
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post #14 of 16 (permalink) Old 07-07-2009, 10:42 PM Thread Starter
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Thank you everyone AND Benzronnie59! I am becoming an unexpected clairvoyant about this d*** transmission! What has been said about the bowden cable and modulator is EXACTLY what I have been telling my garage for over a year now...Based on much from what I have gathered here as well as doing my own research! They have my 300TD currently back in their bay after a somewhat forward letter that I wrote to them about the cost (almost $3000.00), as well as the lack of follow through and continued abrupt shifting. I also have had 2 conflicting opinions about the torque converter. One individual claims that regardless that the original died after 211k, that a "torque" rebuild is not nessessary. The opposing side says,"it's a must!" Thoughts??
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post #15 of 16 (permalink) Old 07-08-2009, 07:36 PM Thread Starter
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o.k. guys/gals...Now I still am unclear about the relation of the torque converter! Should it have been serviced at the same time as the transmission rebuild? Or is it uneccessary to rebuild it after 211k miles? also, in regards to a previous reply, does one need to adjust the bowden cable/trans modulator, drive it a see if its shifting true, and start again if not? Or can this be reconciled while up on a lift?
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post #16 of 16 (permalink) Old 07-19-2009, 08:30 AM Thread Starter
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'82 300TD tranny response:

Update: as far as the harsh shifting, the bowden cable IS gonna be a hit or miss typa thing as advised by this forum, and after many attempts, it is shifting a bit better..a bit! Also, the inability for the tranny to downshift into a lower passing gear, turned out to be the, well, kickdown switch which was covered up by the pedal pad! All is good @ the moment, thanks! I have this Q posted in conjunction w/ the 126 forum: Is a wind reflector w/ 2 clips gonna afford a water tight seal if I install it??
P.S.....This signature is my snow white '82 beauty, "Barbara", on her way to the garage after her drive shaft wiggled loose.

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