1966 230SL automatic upshift problem

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caviper@comcast.net - 02 Apr 2008 01:46 GMT

While driving about 60-70 miles per hour the engine went into high
revs like if you bumped the shifter into neutral. After slowing to
side of road the transmission kicked in again but would shift into 3rd
or 4th. Also I noticed the speedometer stopped working. I limped the
car home driving along 10 mph keeping the rpms down under 2K. The
transmission has fluid, its full, clean & not burnt. The Mercedes
shop near my house has no idea and all the guy there keeps saying to
me is we need to take the trans out, take it apart and take a look at
it. Anyone out there got any idea's beyond that? Thanks.

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Roland Franzius - 02 Apr 2008 07:50 GMT

caviper@comcast.net schrieb:

> While driving about 60-70 miles per hour the engine went into high
> revs like if you bumped the shifter into neutral. After slowing to
[quoted text clipped - 5 lines]
> me is we need to take the trans out, take it apart and take a look at
> it. Anyone out there got any idea's beyond that? Thanks.

He is probably right. The system of braking belts seems to make
problems. After 40 years its time to change the belts and check the
transmission hydaulic control system.

With a 1968 230 automatic the same symptoms arouse with a broken
transmission oil cooler inside the radiator. The mix with coolant made
the transmission oil white and the wheels slipped through under the
belts under acceleration.

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Roland Franzius

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-->> T.G. Lambach <<-- - 02 Apr 2008 19:34 GMT

I suspect your man is correct when he says that the box needs to be
removed and disassembled. The bands or their servos are probably the
prime suspect and a piece thereof may be responsible for the dead
speedometer.

There are professional rebuilders of these boxes, I recall a name like
"Silver Star" or something similar, the advantage being a firm price and
a warranty.

Still, pretty good for a 42 year old transmission!

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