Yesterday while in the 1984 300DT, I pulled out onto a road which was going up a steep hill. As I stepped on the go pedal, the transmission didn't engage and the engine revved up. I backed off the accelerator some and the transmission then engaged. The rest of the day the car shifted normal. Drove it again today and experienced normal shifting. The car has never exhibited this type of behavior in the past. Any ideas?

It is slipping,typical damaged trans symptom.
Sounds like you may be ok for a while if you tighten modulator just a bit to the right,you may get up to 50k more miles out of it but the shifts will be harder.

as always, check your fluid, and if it's been over 30K since a fluid and filter change, consider it.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I'm just wondering if the car might be a candidate for a Superior shift kit. Thoughts?

It's probably low transmission fluid. when you check the fluid levelm the car must be running and up to temp. also it's a good idea to go through all gears. I had a 76 240D that ran for years with a transmission leak. when it started flaring on the highway, I'd add a quart of trans fluid.

Also could be a dirty filter

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Ditto, fluid level.

You can use the later type filter that allows the fluid pick-up to move back & forth.
They will fit any of the 722.3 transmissions.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
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can you put a part# and a link to the pic of this from fastlane here?

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

ditto that.

129-277-01-95 IS that filter, Mann H 1914/2
http://www.allpartsexpress.com/searchItem.epc
Good for heavy cornering as well.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Since this particular flare occurred while starting out going up a fairly steep hill, I"m wondering if the transmission filter didn't pick up the fluid properly......