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#1
02-26-2009, 05:29 AM
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1983 380SL problem shifting trans shifting second to third
hi eggnots here need help 1983 380 sl 125k on it having problem with shifting on auto trans.shifting from second to third has some eng revs then shifts kind of hard. some times shift ok could this be in a modulater.
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#2
02-27-2009, 08:42 AM
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that or control rod linkage, vacuum leak, do search, several active threads on this right now
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#3
02-27-2009, 09:01 AM
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I assume this is 125K miles, correct?
You could have worn clutches in your tranny. I do, regretfully, at 108K miles on a 1982 380SL. Especially if transmission fluid changes and filter changes were neglected by previous owners over the years. As the solution is to rebuild the transmission I have decided to live with it until it becomes much worse. It could be a vacuum issue, could be a modulator issue or could be transmission internals. Does the problem manifest itself ALWAYS as an rpm spike between 2 and 3 with a delayed up shift in gear? Do the symptoms change if (1) the transmission is cold or warm? (2) you accelerate harder? (3) going up a steep hill Any further info may help. There is an excellent set of posts of this subject in the diesel forum where you can pick up most of the control principles of the MB transmission. The principles of transmission control are the same in your car, I believe, with configuration differences of course.
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#4
02-27-2009, 07:51 PM
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I am chasing my issue as well, mine is a true flair, no hard end, happens cold or hot, worse on hard acceleration, no change with terain. I am going to check my control rod linkages this weekend.
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#5
03-02-2009, 09:42 AM
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Check my posts on the modulator valve. With the SL models it is very important to make sure there are no vacume leaks, since the modulator valve requires vacume to operate the transmission. The transmission needs to know what the engine is doing and it knows this by the vacume. As you will see in my posts on this subject, it is very easy to remove the vacume line from the valve, unscrew the valve itself, and attach a vacume pump to it. You should see the pin on the working end move in and out with application of vacume. You can easily find my posts on this subject by searching my name "danwashuk"............Good Luck.........Dan
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