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  #1  
Old 01-26-2008, 07:18 PM
82 300sd,85 300td,87 sdl
 
Join Date: Jan 2008
Location: catskills ny
Posts: 8
transmission help needed

i am having problems with the transmission of my 82 300sd. it has problems getting into forth gear. a few weeks ago it wouldn't go into forth until warmed up. now it is taking longer.....
i pulled the vacuum line from the tranny and it reads 16, it falls to 6 when i pull the accelerator
the fluid is ok and it and the filter was changed out recently

i have had the car about 2 years, i got it from the original owner
it has just passed 100,000 miles


any words of wisdom on how to get the car back on the road would be appreciated

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  #2  
Old 01-26-2008, 10:20 PM
dkveuro's Avatar
Sword of Damocles
 
Join Date: Jun 2003
Location: Here an' there.
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Vacume should be zero at full throttle......and 5 inches at half throttle.
16 inches is max' at idle. If it sees 5 plus inches at WOT it will not shift until 4800 rpm.


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  #3  
Old 01-26-2008, 10:30 PM
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Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Vacuum has very little to do with shift points and less vacuum would make the shifts higher if anything. Check your control pressure cable, be sure it doesn't stick out at times and disconnect the kick down switch under the gas pedal.
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  #4  
Old 01-27-2008, 12:02 AM
82 300sd,85 300td,87 sdl
 
Join Date: Jan 2008
Location: catskills ny
Posts: 8
Control pressure cable

Thank you for the suggestions.
I can handle disconnecting the switch behind the pedal, but need a few more words when possible.
Please explain how to check the cable and how to identify it.
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  #5  
Old 01-27-2008, 04:43 PM
82 300sd,85 300td,87 sdl
 
Join Date: Jan 2008
Location: catskills ny
Posts: 8
Control pressure cable

I got the switch behind the gas pedal disconnected but that didn't get her cruising in forth unfortunately.
The line that leaves the throttle linkage and heads behind the engine and down towards the transmission has a loose tie-down.
I could get it up on stands in a few days to check out its condition at the tranny end, just don't know what to do when i'm there.

Any more ideas?
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  #6  
Old 01-28-2008, 10:28 PM
whunter's Avatar
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,359
Quote:
Originally Posted by simonisaac View Post
I got the switch behind the gas pedal disconnected but that didn't get her cruising in forth unfortunately.
The line that leaves the throttle linkage and heads behind the engine and down towards the transmission has a loose tie-down.
I could get it up on stands in a few days to check out its condition at the tranny end, just don't know what to do when i'm there.

Any more ideas?
If this is loose or damaged, it is 99% your issue.

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1982 Mercedes Benz 300SD
Part: AT Kickdown Cable
Note: Trans: 722.303
J4000-66411 AT Kickdown Cable Gemo IN STOCK
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transmission help needed-j400066411gem_uiyserfuyg825.jpg  

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