I've had good success with replacing the K1 spring with the kit from the dealer, like $13 a year ago. I also tried using a K1 spring kit to replace the K2 in my it helped a little but not a whole lot. I think I'd go for the Superior Shift Kit. I think you get more option for adjustment from those kits.
Here is my thread about my 2-3 and 3-4 flare.

3-4 flaring shift.

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very cool...thanks dude...you just confirmed my suspicions....I'm going to go ahead and order the superior kit..what can it hurt? worst case I have new spring for the rebuilder!! thanks for the link!

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-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)

FYI Everyone following...

While my modulator WAS holding vac, I couldnt get more than 25 psi with the pin cranked all the way in. So I ordered one. I pulled the modulator to see if the pin was broken, it wasnt. It was oozing a rust colored liquid from under the black cap.



I installed a new modulator (febi/biltstien) and pin which had a longer base as well as overall length.



Then I hooked up the pressure rig, and it was (miraculously) reading at 42 psi at idle, dead on. Quite amazed I didnt have to adjust it.


I test drove it and the 3 to 4 flare is gone, still a slight on the 2 to 3...so I adjusted the VCV to put only 10" to the modulator at idle. Still a slight flare, which went away when the car warmed up.

BTW the modulator (from Fastlane, came with the o-ring seal and the rubber cap, no need to buy extras)

At this point the 2 to 3 is firm, clunks a little and I cant feel 3 to 4 at all.

I plan on tinkering with the VCV a little more but am quite happy that the problem is "resolved" and I dont need to rebuild the trans.

I'm debating on if I should install the "Superior Transmissions Shift Correction" spring kit I bought now or maybe at next fluid change or maybe sell it?

As always your thoughts, comments and ideas are appreciated!

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-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)