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Old 03-24-2008, 10:11 PM
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Join Date: Jul 2006
Posts: 178
Question transmission issue..

my 1987 420sel that i purchased in austin will do the following..

it will go in reverse when the engine is cold and when it heats up....the tranny fails in reverse...

any ideas at all besides a fluid filter change and a rebuild of the tranny??

help is much appreciated

lyle in austin

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Old 03-25-2008, 07:57 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
If you do a search for that condition you will see that has always been a problem on the 722.3 series transmissions.
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Old 03-25-2008, 01:31 PM
Join Date: Jan 2003
Location: Florida
Posts: 1,084
I have the same trans and had same symptoms on my 92 SEL, step one made no difference, step two much more costly fixed it. I went the MB rebuilt route, $3k + labor. I agonized the descision, but went for it. You will have to make the call, its the front clutch from what I gather. it is 9 hrs labor to R&R no idea of tear down. A unknown used could work, a good rebuilder, AAMCO or such I dont know.

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