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  #1  
Old 02-05-2003, 09:14 AM
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Join Date: Mar 2002
Location: MD
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1988 300E Reverse Shift Problem

All forward shifts are excellent. Little or no flair hot or cold with crisp shift.- - however, when cold when I shift into reverse transmission slips and does not catch at once. I let car warm up and no problem. Transmission has longer delay than my 400E and 380SL when shift into forward or reverse. Am I due for replacement. Car has 200K miles with good maintenance; and transmission fluid and filter changed 20K ago. Would another change be helpful and what adjustments might help.
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  #2  
Old 02-05-2003, 06:36 PM
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Reverse clutches are probably worn, when the fluid heats-up that causes the clutches to expand & then lock-up. VERY common!
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  #3  
Old 02-06-2003, 08:41 AM
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M.B. DOC Thanks for the fast response. I rather suspected that it was the reverse bands from previous posts. I have made inquiries to have reverse bands replaced but everyone wants to go through total transmission. Cannot find independaant who works on trans. only sends out to trans shop. When I replace I plan on getting MB rebuilt and having independant R&R. DO YOU KNOW OF ANY SHOP WHO WILL/CAN REMOVE TRANS AND REPLACE REAR BANDS ONLY- -SINCE THEY ARE IN BACK WHAT WOULD BE A FAIR CHARGE. I had the trans removed and re-sealed last year. Thanks for any help from anyone either in the D.C. or S.C. area.
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  #4  
Old 02-06-2003, 08:50 AM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
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MBDoc pretty much nailed it, sometimes the front clutches will wear to the point where the apply piston will hit the drum. This causes the thing to click and clank loudly in reverse. The front apply piston will leak as well causing slow engagment. Low working pressure and sticking valvebodys (also very common, esp. cold) will cause this as well. Personally, as I've found it cheaper to fix worn parts than fried parts, I'd look into a overhaul rather than letting it fry. (hard parts aren't cheap)



Joe
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  #5  
Old 02-06-2003, 09:11 AM
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Joe- - you guys are making me smarter by the second. I really appreciate the technical input that show reasons for my trans. symptoms. Everything you mentioned is exactly how my trans. acts. Would it be more economic to overhawl or go $1800.00 MB rebuilt. R&R would be same.
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  #6  
Old 02-06-2003, 10:19 AM
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Except for the fact that by the time you notice it there is a tremendous amount of clutch material throughout the trans, it is almost as easy to replace the reverse clutches as a thorough front pump reseal.

We have done a few, but don't anymore after spending hours trying to get a few to shift right later when pieces of the old clutches get in the wrong position in the valve body.

The problem is easily fixed if done before complete failure and a good independent will save you some money. We do the whole job, complete overhaul with modifications for 1600, installed, filled, adjusted and out the door. We have done hundreds and never have mechanical failures, only an occsional shift irregularity.
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  #7  
Old 02-06-2003, 04:31 PM
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Just took a look at the NEW MB pricing on that transmission, 124-270-30-01-88 & looks like it took a jump in price to over $2,200.
AS "Steve said" replacement of the clutch discs isn't a bad idea at all
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  #8  
Old 02-07-2003, 01:10 PM
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Many thanks for the posts which confirmed what I suspected for my 124 trans. JOE, I especially appreciate the technical detail that you went into which made me understand why. M.B. DOC you were very helpful and gave excellent advise as always. STEVE, I had already read your articles on MB trans. and will contact you off line to arrange for overhawl.
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  #9  
Old 02-07-2003, 02:03 PM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
Overhauls are always better BEFORE they fry. Then you have little to no hardpart damage, dont have to remove drums with a hammer and clean lots of shrapnel out of the valvebody. (all of which adds up to $$$$$$$$) However, if the foward clutches are the only ones worn out, by all means, replace them, reseal the foward apply piston and external seals and drive it.




Joe
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