Question about 1984 Mercedes-Benz Mercedes Benz 300 Class

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Bizarre shifting pattern 1984 Mercedes 300D automatic

Ok---the trans is probably junk but here goes:  Car starts off in 2nd, jumps down to 1st back to 2nd then quick 1st , 2nd, 3rd......
The pattern is the same whether you floor it or accelerate slowly. If you wind it up in first and shift manually it works fine.
The kick down cable is not responsible, disconnected it--no change.
The vacuum modulator is not at fualt, ditto as above, no change.
I suspect the ''B2'' piston has failed, I've read alot about that and seems like a typical problem.
I decided changing the trans fluid and filter will accomplish nothing except hasten the trans' demise.
Reverse does take a few seconds to kick in.
Trans fluid is pink and nice, full too.
?

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  • palarjones Feb 12, 2009

    my 1984 300cd turbo coupe goes in reverse but cannot go forward. What could be the problem?

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Hello, The adjust of your t/v cable, not kickdown cable, and the operation of the vacuum controller at the rear of injection pump, and the modulator, is critical for this car to get a good shift.
Put you cable back on, adjust it so that when you have wide open throttle, the cable does not have any slack. Check the black vacuum line by the oil filter housing that goes to the modulator to see if it has vacuum. It should have about 10-15" vacuum and as you increase engine speed it should drop. If you get close to this, the trans should shift ok. If you cannot get vacuum at the modulator line, you need to ck vacuum supply, valve at rear of injection pump, hose routing, etc.
If the B2 piston failed, it would be difficult to move car or slip badly. Also, take into mind that at the bottom of your accelerator pedal stroke is a kickdown switch.
If you accomplish what I instructed, you will probably get a decent shift.
If you find this information to be correct would you please enter a "fixya" rating.
Thanks, Gator241

Posted on Feb 12, 2009

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