I have a 1984 Mercedes 300D tranny is a 722.315 I have flare in the 2-3 shift and need the k1 spring (thrust pin) part number 126 270 44 77. Is the k2 spring (thrust pin) the same part number? The k2 controls the flare in the 3-4 shift which on my car isn't bad but thought I should relplace it while I am doing the k1. Thanks

No. The original springs are not the same. In some cases, the new K1 spring is installed in the K2 accumulator as a problem-solving tactic.

Do you happen to have the part number for the k2 thrust pin?

Evidently, the part number for the original spring is hard to come by. Personally, I would not replace the k2 spring if the 3-4 shift was satisfactory.

I have both springs out of the car now and they look really close to the same so much that I can't tell any difference between them. I think I will take your advice though and just replace the k1 thrust pin with a new one and clean the original k2 and put it back in. Thanks again this forum is awesome!

There were different versions of the K1 and K2 spring trains over the years. Later versions might have been the same. Earlier versions were not.

No, here is what came out of my 82 300TD's trans, the old K1, K2, as well as a new K1. When I put in a new K1 the 2-3 shifts firmed up nicely, when I put a new K1 into the K2 it firmed up the 3-4 shift but not much.
Here's my post all about it. - 3-4 flaring shift.

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Well I put the new k1 springs in cleaned up the old k2 and took her for a test drive. The 2-3 shift was great and then noticed the 3-4 was flaring. I am sure it did it before but didn't notice it much because of the bad 2-3 flare. Not too bad but enough to make me take it all apart again and put a new k1 spring in the k2 hole. Now 3-4 shift is firm. This forum and $32 worth of parts saved my tranny.

sorry for jumping on somebody else's thread.. but hopefully someone can help too.

I've read alot about K1 replacement when 2 - 3 shift has flares. Most of them are talking about 722.3 tranny... I have a 722.111 tranny, can I use the same part number for K1 spring?

Thanks..

I'm not sure about the K1 or K2 on the 722.1, but I do know you have a mechanical modulator. It can be adjusted to soften or harden shift. Here's a pic of the one from my 77 300D. It's on the passenger side of the trans.

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hi,

actually mine is vacuum modulated, it' an 1980 280. and I tried to adjust the module before, but it didnt help since my problem is flaring during shifts..

Sorry, posted in wrong topic. Had too many tabs open. Sorry about bumping an old, old post. If a moderator sees this, please delete this message

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)

You might not have meant to post here but I think your story is worth adding to the thread just in case anyone is thinking about springs =>

Lost 4th gear....

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



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