I had a scary thing happen today. Starting off from a stop when my 1985 TDT shifted to 3rd ( W-123s start in second normally right?), it slipped bigtime in the 2-3 shift. I was going about 35 mph max. I pulled over, put it in park and reverse and back to park. Then I drove home normally, that is ,everything shifted normally. What's going on ? This car has about 345,000 miles. This isn't the B-2 problem is it ? Anyone have any ideas ?

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David McDonald
1981 240D
1985 300D (wrecked)
1985 300TD 365,000 miles
1969 Mustang Fastback

I forgot to mention the filter has not been changed in about 150,000 miles, could that cause what I described ?

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David McDonald
1981 240D
1985 300D (wrecked)
1985 300TD 365,000 miles
1969 Mustang Fastback

Probably fluid has not been changed either.
All you can do is change them and hope for the best.
A blocked filter could cause all sorts of strange things.
Dirty old fluid is a bit like kidney failure, it creeps up slowly.
Has the car had any other maintenance?

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

I understand a clogged filter reduces the fluid pressure. A/T fluid is not just a lubricant, it is also a hydraulic agent that activates valves inside the transmission...

I ain't no expert though... just trying to help.

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'82 300D (project)
'46 Willys (project)
"Nothing seems to be the way it should in this garage." -jt20
"Smarter than an engine, dumber than a hoodlatch..." -jt20
"Start jumping up and down to smoosh down those engine mounts" -DeliveryValve
"no" -kerry
"At this rate, you may have it done by winter" -layback40