Narrowing down no 4th gear issues Need Help - Mercedes-Benz Forum

 
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post #1 of 1 (permalink) Old 04-08-2012, 08:05 PM Thread Starter
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Date registered: Apr 2012
Vehicle: 82 300SD
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Narrowing down no 4th gear issues Need Help

I have a recently acquired 82 300SD and it does not shift into top gear. It runs about 4000RPM at 30mph so I know a gear is missing.

I have been hunting everywhere online to try and figure this out and have come up with many possible solution and am eliminating them as best I can.
I started with the possibility of a vacuum leak so I bypassed the EGR vaccum lines and tested the vacuum reading at the Modulator but it reads fine at idle. I tested the Modulator for leaks but it holds vacuum just fine.
The Kickdown button under the gas pedal is not stuck but I still need to test the solenoid.

I am going to try and readjust the gear shifter linkage next. Just to make sure everything is lined up properly.

On my ToDo list is Check kickdown solenoid, check and adjust modulator pressure. If those don't work than my next possibilities are a bad governor or possibly the K2 clutch.

This is everything I have found that could be the cause of this issue.
Have I missed anything anybody can think of? Any advice anybody can give would be greatly appreciated. Thank you in advance.
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