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  #1  
Old 11-04-2014, 09:24 AM
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No forward in transmission. 1984 300d w123

Ok I was driving along this morning and my transmission just dropped out of gear with a bit of a bang. Never would go back into gear. Reverse still worked and I made it the ~1-1.5 miles back home.

It dropped out twice in the past month or so for about a second before kicking back into gear. At that time I checked the fluid level and it seemed fine.

It has always been a bit rough in shifting (ive had it for about a year and a half.) but I always thought it was vacuum issues.

Is this likely to be the b2 piston?

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  #2  
Old 11-04-2014, 11:58 AM
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Yes, my dads 300sd did the exact thing your car did. Lost foward gears but still had reverse. Changed b2 piston and it was back to normal.
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  #3  
Old 11-18-2014, 01:21 AM
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Dammit. Went to change it and the piston was fine. The part in the transmission the push rod goes against on the other hand was not. Looks like i need a new transmission or a new car. not sure which.

Thoughts on going manual?
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  #4  
Old 11-18-2014, 01:43 AM
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Some people think the conversion to manual is the best solution to a broken automatic transmission. I think replacing with an other automatic transmission is less work than a conversion for the average DIYer. I think a certain dedication and a love of manual transmissions is required to do the conversion. It is a lot of work.
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
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Don't leave that there - I'll take it to bits!
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  #5  
Old 11-27-2014, 12:34 AM
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Found a 1977 240D with an automatic. Would it be a possible donor for my 84 or is it too old?
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  #6  
Old 11-27-2014, 03:02 AM
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Post

Quote:
Originally Posted by birdman3131 View Post
Found a 1977 240D with an automatic. Would it be a possible donor for my 84 or is it too old?

Not a good choice. Weaker unit and different control system I believe.
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  #7  
Old 11-27-2014, 06:13 AM
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Location: 1993 300E 2.8L M104
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722.433 INFO

hey,

had the same problem a while back, with my w124/722.433 transmission.


before pulling/replacing the transmission, try dropping the valve body and then inspecting the B2 brake band.


the problem could be that your b2 brake band needs to be adjusted via new(longer) thrust pin. its an inexpensive repair, a new longer thrust pin + retainer clip = $15-20 from dealer.

or

worse case scenario: broken b2 band = would require a rebuild


drop the valve body and take a better look.

good luck
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  #8  
Old 11-28-2014, 11:22 AM
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It is the band itself. Metal is completely sheared. Im not gonna bother with a rebuild. No need to remove the valve body to see
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  #9  
Old 08-22-2015, 11:17 PM
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Well after letting this sit for a bit longer than i meant to I may have found an 84 190D with an auto transmission for cheap. Is this a possible option for a donor?
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  #10  
Old 08-23-2015, 04:56 PM
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The 190 has a different series of motor ,which part of the US ?You can find some part cars under CL sometimes with close locations .
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  #11  
Old 08-23-2015, 06:34 PM
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I found this 190d on craigslist. And it is the transmission I care about not the motor.
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  #12  
Old 08-23-2015, 06:41 PM
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Usually coming from a different series of motor will mean it will not bolt up to your engine...
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  #13  
Old 08-23-2015, 06:45 PM
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I did the switch from auto to manual, and well worth every minute. Actually, about a one day operation collectively.
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  #14  
Old 08-24-2015, 01:28 AM
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That trans from the 190 definite won't bolt up. Starter motor's on the wrong side.

Keep looking.
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  #15  
Old 10-16-2015, 09:45 AM
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http://robertspartsupick.com/inventory.aspx?make=MERCEDES-BENZ&model=380 Would this be a donor car?

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