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  #1  
Old 02-03-2003, 10:03 PM
89nuclear
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Question 1989 300SE Auto Transmission slips

I have recently purchased 1989 300SE 6Cyl auto non-turbo with 130 K miles. It slips when shifting up into next gear (all) on acceleration. Fluid is clear.

I can replace myself ( I think) with a salvaged one, rebuilt, or would like to try some things first.

Also, I assume this is 4 speed with lockup converter. How many RPMS should I turn at about 60. Does ~2800 sound right? Is Dextron the correct fluid.

Any suggestions appreciated.
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  #2  
Old 02-04-2003, 08:50 PM
89nuclear
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Also are there any inherent problems to this model Mercedes. This is the first one I have owned.
Thanks
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  #3  
Old 02-05-2003, 02:55 AM
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there was just a bunch of postings regarding this type of problem. Do a search using the word *flaring* I think you will find what you need.
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  #4  
Old 02-05-2003, 09:16 AM
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The first thing I'd recommend is a fluid and filter change. If the filter is clogged a bit with use and age, I think that can lower the system's hydraulic pressure. And I have had excellent results with synthetic Dextron-III ATF - currently using Quaker State 4x4 fluid.

I had a problem that started showing up in cold 3-4 shifts. The shift would not execute and the car would just rev. New fluid and filter completely eliminated the problem.

Ken300D
(refers to my 1982 300D)

(also have a 1987 300D)
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  #5  
Old 02-05-2003, 10:03 AM
it leaks, its german
 
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bump the modulator pressure and drive it, if the slip is consistent in all shifts, sounds like low apply pressure.

the modulator is on the l/h side of the box in front of the manual valve arm. (shifter) pop the little rubber cap off and turn the enclosed key clockwise 3 turns, put the cap on and drive it..... too firm, back it off in 1/2 turn increments.

if the shifts are late or early, adjust the bowden cable (under the air filter behind the a/f sensor) longer housing, later shifts, shorter housing, earlier shifts.



Joe
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  #6  
Old 02-05-2003, 09:25 PM
89nuclear
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Wink 89 300SE Modulator adjustment

Thanks for the advice. I adjusted 3 and seemed like it was still not enough so I went 4 1/2.
This seems to have solved the problem! I hope it holds up. The 1st shift is not as crisp as the others but is very good compaared to what it was.

Do you 4 1/2 was to much and should I consider modular change out, etc.

I also am turning ~2400 rpms at 50. Is this correct because I really can't feel it go into 4th but when I go to 3 it does downshift.

Thanks for all your help.
John L
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  #7  
Old 02-06-2003, 12:34 AM
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Our trannies start in 2nd gear... maybe thats why you don't feel it going to 4th.
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  #8  
Old 02-06-2003, 02:24 AM
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89nuclear

Have you replaced the trans filter? When you do be sure and drain the torque converter as well.

Haasman
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  #9  
Old 02-06-2003, 05:31 PM
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There's no torque converter lock up.

If the transmission is responding to the modulator adjustments, it's likely not a bad modulator.

Sixto
91 300SE
87 300SDL
83 300SD
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  #10  
Old 02-06-2003, 05:46 PM
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If you had to go 4.5 turns something is big time changed. Could be the modulator. I would verify that the vacuum to it follows manifold vacuum (goes to zero at full throttle).
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