My 89 420sel has 169,ooomi. I do not know if the po's had any work done on the trans. It shifts rough mostly when cold then it gets a little better when it warms up.Is there an adjustment that i can do? If so what, and where can i find it.

If you do a search, you will find plenty of info on transmission adjustments.

-Good luck

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

All the info is for the 300 or 190 i have a 117 014 oo 02 trans.I looked under cor on drivers side and found a 1inch dia.black thing with a smaller black cap[this is where the vacuam line comes from]i removed the cap and found a slotted thing with a piece of metal across two slots.???????

TRY ADJUSTING THE VACUUM MODULATOR ON THE TRANSMISSION. TURN THE ADJUSTER OUT FOR A SOFTER SHIFT, BUT NOT TO SOFT.

Where is it and what does it look like?

IT SHOULD BE ON THE LEFT SIDE OF THE TRANS. IT SHOULD BE COLORED WITH A VACUUM LINE COMING OUT OF IT. REMOVE THE LITTLE BLACK CAP, PULL OUT THE SILVER "T" BAR SO IT PASSES THE PART IT IS LOCKED INTO & TURN COUNTER CLOCKWISE TO ALLOW MORE VACUUM. ADJUST AS NEEDED BUT DON'T MAKE IT TO SOFT OR IT WILL SLIP.

WRM: i TURNED THE TEE BAR COUNTERCLOCKWISE 4 SLOTS AND IT IMPROVED SOME. HOW MANY SLOTS CAN I TURN THIS AND HOW DOES IT ALLOW MORE VACUAM tO THE TRANS?