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Old 04-05-2004, 02:30 PM
Registered User
Join Date: May 2002
Location: Chicago
Posts: 31
Need W126 trans B2 piston sleeve part no.

Am presently ordering the parts to do the old B2 piston replacement on my 1984 500SEL (euro, 722.311 trans). Can easily get the piston and seal ring from Phil at this site (good guy, and always helpful). The sleeve is supposedly now a plastic part available assumably only from dealer. I would like to give them the part number to make sure I get the right thing, and because they tend to give me a better deal when I can just call with the part number. Anyone have the right one?

Allen Gara

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Old 04-05-2004, 10:25 PM
C32AMG's Avatar
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Join Date: Mar 2004
Location: new york/orange county
Posts: 639
The updated B2 servo is # A107 270 04 32.plastic guide is 126 277 08 050. You are also going to need the B2 servo seal I do not have that part number handy. it is not easy to change the seal in the car
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Old 04-05-2004, 10:36 PM
jbaj007's Avatar
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Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
I think these may help. As C32AMG said:

005 997 70 48 B2 seal ring
107 270 04 32 updated B2 piston
126 277 08 50 plastic bushing for updated B2 piston
006 997 73 47 seal that holds in the bushing
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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Old 04-06-2004, 11:55 AM
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Join Date: May 2002
Location: Chicago
Posts: 31 on order

I figured out when listers refer to the "sleeve" they really mean "bushing". After that dawned on me the parts came up same as the above. Gave a quick call to Phil at this site and he confirmed the numbers. From the Stu Ritter procedure descripts it appears that the outer seal ring does not have to be replaced, and actually can't without dropping the trans. I intend to follow up on this string after the weekend, when the operation will take place. This relatively easy repair is hopefully going to cure my trans upshift "flaring" as it's commonly called. That term also threw me; seems simpler to just say "slipping between upshifts". IMHO anyway. Tomato, tomahtoe.
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Old 04-06-2004, 12:00 PM
Registered User
Join Date: May 2002
Location: Chicago
Posts: 31
Angry small correction

I will replace the outer seal ring holding the bushing, it's the outer cover seal ring that can't be replaced. Sorry bout that.

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