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  #1  
Old 07-10-2007, 10:57 PM
Registered User
 
Join Date: Feb 2003
Location: Ohio
Posts: 66
722.310 Transmission help needed 83' 380 SEC

Hi,
I need help diagnosing a problem with my 1983 380 SEC transmission. I rebuilt the trans replacing all clutches and steel plates, upgraded the B2 piston. The trans has a very harsh shift into reverse and occassionally will clunk when downshifting to first gear. All upshifts are very smooth and the trans seems to operate great except for the 2 described problems. I cleaned the valve body during the rebuild and reinstalled all the parts the same way they came apart. Any help or suggestions would be greatly appreciated.
Thanks in advance.
Bob

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  #2  
Old 07-11-2007, 10:11 AM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
did you replace modulator? or is it poss that the mod was tightened to cover the flair that was created by worn clutches[before you rebuilt]?
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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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  #3  
Old 07-11-2007, 10:48 AM
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Join Date: Feb 2003
Location: Ohio
Posts: 66
David,
Thanks for the reply. I did not change the modulator although I do have a new one. I wasn't sure how to check the pressure after installing a new modulator. The manual I have describes connecting a gauge (routed to the inside of the car) and driving 30 miles per hour to check the pressure. I did make some change to the old mod by turning in the adjuster 1 turn but it didn't make any difference. I was thinking that the valve body would need a rebuild, not just a cleaning. It is a first gear start valve body. Am I on the right track thinking the problem is related to the valve body?
I wasn't able to drive the car before the trans rebuild because it needed an engine rebuild and had sat in a garage for 11 years. The car had 79,000 miles on it. I am sure the trans was worked on because there was red RTV everywhere.
Thanks, Bob
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  #4  
Old 07-11-2007, 04:17 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
your mod press is too high turn back the turn you moved it plus another 1&1/2 [ccw] and see what happens.
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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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  #5  
Old 07-11-2007, 11:07 PM
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Join Date: Feb 2003
Location: Ohio
Posts: 66
Thanks for the info, I will make the changes tomorrow and let you know.
I appreciate the help.
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  #6  
Old 07-12-2007, 09:37 AM
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Join Date: Feb 2003
Location: Ohio
Posts: 66
David,
Thank you very much for the help. I backed off the adjustment on the modulator and the harsh reverse disappeared. The upshifts still work great too.
Thanks again, Bob
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  #7  
Old 07-12-2007, 10:29 AM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
glad to be able to help.

__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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