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Trans slips after service

 
Old 10-05-2018, 10:14 PM
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1983 Mercedes 300d
Trans slips after service

Hi,

I have a 1983 300d. The trans was shifting hard so I decided to change the trans fluid and the filter. The car only has 66,000 miles on it, and I believe it is the first time the transmission has ever been serviced. I drained the pan but did not drain the torque converter. I changed the filter and buttoned everything up, there are no leaks.

I drained about 3 1/2 quarts of old trans fluid out of the car and ended up replacing about 4 quarts to get it just below the top line on the dipstick. I replaced it with Valvoline Dexron III / MERCON

So, the transmission no longer shifts hard. It now shifts very smoothly. It does, however, slip slightly between 2nd and 3rd gear. It won't slip if I take it very easy.

Why would this happen? I did not knock any thing off, vacuum lines, etc...My research tells me that the fluid type is what is recommended. I did not put synthetic fluid in the car because I don't think it was ever changed. I did not change torque converter fluid because I read it is better to leave that alone.

It is a very low mileage trans. It shifts much better now, no clunking. Just the slip between 2nd and 3rd.

Any thoughts why it now slips?
Thanks in advance.
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Old 10-06-2018, 10:48 AM
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You changed heavy ATF with lighter ATF.
That makes for smoother shifting, but also more slippage on gear changing.
That is adjustable by valve on bottom of the transmission. I did it long years ago, so don't remember details, but fellow W123 owners should give you update.
Disconnecting vacuum line from transmission would make for abrupt shifting.
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Old 10-06-2018, 02:21 PM
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1983 Mercedes 300d
I just returned from a 75 mile drive and it is no longer slipping. A little noisy clunk from 2nd to 3rd gear but much better and no slipping at all. I did not drain the torque converter so I am thinking that the news fluid mixed with the old and it's fixed the issue?
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Old 10-06-2018, 02:57 PM
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More likely you had air bubble in the system.
Good idea to recheck the level.
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Old 10-07-2018, 01:54 PM
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I’m also of the mind it finally purged air trapped in converter and other locations, recheck levels hot and cold now.
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Old 10-07-2018, 10:01 PM
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If you really think it was the first time fresh fluid has entered the system since it was new, it would be worth dumping another round of fluid. IMHO.
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Old 10-07-2018, 11:13 PM
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Agreed
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Old 10-10-2018, 03:41 PM
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1983 Mercedes 300d
Must have been air. After a few hours of driving all is good now. Thanks.
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Old 10-25-2018, 12:29 PM
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Originally Posted by Micah / AF1 Rac View Post
Agreed
i thought that vintage had a converter drain plug.
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Old 10-26-2018, 02:42 AM
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The bearing collapsed in my 123 's converter and sent metal sludge through the system blocking the valve body, caused all sorts of problems
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