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Old 06-24-2000, 12:37 PM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,141
Vehicle is a '91 300-SEL. Research on this site indicates I have a 722.3 transmission.
On another WEB site I've read all sorts of horror stories about B2 pistons failing in
early 80's thru early 90's 722.3 transmissions.

- Is this device accessible after removing
trans pan?
- If fluid and filter are change annually &
car is driven in a sane fashion, what is
the likelyhood of failure?

Thanks for your time.

Mike Murrell
Boerne, Texas
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Old 06-24-2000, 01:59 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Actually the B2 failure is one of the good things. The other tranny question running concurrently probably had this simple problem. To bad he already paid over 2100 to re-rebuild it.

The B2 servo piston was redesigned in later years and the replacement doesn't fail. It is easily replaced from the outside and is working in all forward gears except 4th. B2 is the Band for first gear, B1 is added for second, B1 is dropped and K1 (?) is added for 3rd and B2 is dropped and K2 (? not sure the nomemclature on K1&K2) added for fourth gear.

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
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