What could have failed? Many possibilities, but I'd vote for a conspiracy between bad internal seals/low pressure, worn friction surfaces, and possibly a weak pump. Could be as much as everything, or as little as bad control pressure regulation.

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Gone to the dark side

- Jeff

This is a '93 300D and most everything I read suggested that the transmission was different than the '90-92 models.

The replacement transmission came from a '92 and had according to the salvage yard 120K on it.

My latest issue is that I can't downshift.

I can start out in 2 and 3 and it will stay there but when I am going down the road and try to downshift to save my brakes or on a steep downhill before a red light it just goes into neutral.

What would cause that?

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1993 W124 300D
-297K on the clock as I type this.

bump....

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1993 W124 300D
-297K on the clock as I type this.

Not sure if this is what you mean.
From the ATSG Manual:

Attached Thumbnails

 

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92 300D 2.5L OM602 OBK #59

Well, apparently I was going too fast for it to engage the lower gears.

I tried it at lower speeds this evening and it did in fact downshift when I moved the shift lever down.

I guess my old transmission was so worn or otherwise defective that it would let me downshift manually at higher speeds.

I don't know.

I am really liking having a functional transmission now even if it does whine/howl a little.

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1993 W124 300D
-297K on the clock as I type this.