Harsh Transmission shifting - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 05-30-2014, 11:36 AM Thread Starter
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Date registered: Mar 2014
Vehicle: 1968 280se, 1972 280se 4.5, Land Rover disco II, Triumph Thruxton, Triumph Tiger. +boring Chevy Van
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Harsh Transmission shifting

Hi All
The two se's i have shift very differently. The 4.5 that was layed up as long as 11 years i come to discover with no use shifts silky smooth. You can barely detect the shifts.
My 6 cylinder 280 which has a new transmission fitted just 5k ago (10 years ago) by the last owner shifts very hard 2 to 3rd then 3rd to 4th. Sometimes its better than other times. But generally it seems too really rev up high before the shift comes in. when it does it can be quite sudden and jerky. I am wondering if this could be remedied? An adjustment of some kind, I was thinking maybe replacing the vacum lines? Maybe there is a leak? Any other suggestions would be welcome. i have read that there is an adjustment to throttle control that could be made but i'm unsure i understand that? How to adjust etc.
Also a faulty solenoid maybe?
The kickdown switch does not seem to do anything when i press down on it? maybe that is a clue to something wrong. One other thing i was thinking even though this is a new tranny it is 10 years old, can tranny fluid deteriorate in some way? And should i change it?
All the Best John.

Last edited by wroding; 05-30-2014 at 11:40 AM.
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post #2 of 5 (permalink) Old 05-30-2014, 12:21 PM
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Those are two totally different transmissions and your experience is very typical of the two. The old 6 cyl should be the K4A 025 transmission I do believe. There are lots of posts here and around about them becoming harsh. Find a good transmission guy. Hacks will just make things worse. Happy motoring!
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post #3 of 5 (permalink) Old 05-30-2014, 12:59 PM Thread Starter
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Are you saying there is not much I can do personally? Adjustments etc.
Cheers John
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post #4 of 5 (permalink) Old 05-30-2014, 01:11 PM
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As I only have my 4.5 now, I have forgotten a little of the 6 cyliner stuff. I will review and report. lol : )
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post #5 of 5 (permalink) Old 05-30-2014, 01:49 PM Thread Starter
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Vehicle: 1968 280se, 1972 280se 4.5, Land Rover disco II, Triumph Thruxton, Triumph Tiger. +boring Chevy Van
Location: Grass Valley california
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Cheers
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