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Old 01-19-2005, 11:21 PM
Registered User
Join Date: Mar 2004
Posts: 26
Oh dear god someone please help

Allright, as you know my tranny has been shifting really rough. I thought it might be a good time to change all the vacuum connectors, the vacuum modulator, the transmission fluid and filter. At first, all that didn't seem to make a difference at all. It did shift a little smoother without the clunk into 2nd and then into 3rd, but it still dragged into 4th gear.

Then I did some work on the car today. I changed a bunch of stuff, nothing in any relation to the transmission. Engine shocks, valve cover gasket, stuff of that nature. Then I drove it to my friends house. At first it seemed like normal, no better no worse. But then it sloowly got worse. Now the car won't go into 1st at all. Then, even when flooring it, it'll shift from 2nd into 3rd at under 2000 rpm, and quickly after that it'll slooooowly drag into 4th. Sometimes really slipping badly.

I accidentally cracked one of the Diesel return lines, so there was Diesel leaking out towards the back of the engine, but I fixed that. Still the same. I checked the vacuum connections. I then tightened the vacuum modulator to make it shift harder, it made no difference. I don't know what else to do. I gotta drive this car every day. Please help.

Thanks a lot, I appreciate it.

1984 300SD, 384K miles. Gold/brown.
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Old 01-19-2005, 11:26 PM
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Join Date: Mar 2004
Posts: 26
When I move the gear lever into it's lowest position it seems to drive out in 1st gear
1984 300SD, 384K miles. Gold/brown.
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Old 01-20-2005, 12:25 AM
Senior Member
Join Date: Jul 2002
Location: visalia ca
Posts: 368
you need to recheck your vac valves and vac supply.
also check that the throttle linkage is moving freely.
check for vac leaks.

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Old 01-20-2005, 02:31 AM
BenzMatic's Avatar
You can do it
Join Date: Jun 2003
Location: OC S. California
Posts: 120
Sounds like a stuck "kick down switch", check it out.

keep us posted
87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)
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Old 01-20-2005, 02:33 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
Did the adjustment of the bowden cable from the throttle linkage to the trans come unstuck?
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 01-20-2005, 08:55 PM
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Join Date: Mar 2004
Location: new york/orange county
Posts: 639
You could have trap vacuum in the modulator vacuum line, if vacuum does not drop while driving, working pressure will not increase, the transmission will slip. The load input for the transmission is the modulator. Drive the car with the vacuum line disconnected from the modulator. If it works you have a problem with the vacuum amplifier, switchover valve or the vacuum line are reversed. If it doesn’t work have the pressures checked
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Old 01-20-2005, 10:11 PM
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Join Date: Mar 2004
Location: Charleston, SC
Posts: 179
Minor detail but "God" is ALWAYS CAPITALIZED.
89 190E
Arctic white
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Pirelli P400 rubber
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Old 01-20-2005, 10:59 PM
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Join Date: Mar 2004
Posts: 26
Allright God will be caps.

Anyway the cable from the throttle linkage to the transmission was the culprit. It snapped for some reason. Pulled one off a junk car and everything is back in working order.

My tranny fluid is really not as red as I'd like it to be. Kind of foamy and pink. I didn't over fill... Is that really bad?

1984 300SD, 384K miles. Gold/brown.
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