Not sure if this doesn’t belong in the tech help since it’s a gasser trans...
Way back I found a rebuilt trans, could be sun valley, could be else. The car was an m103 with a tired shortblock, rebuilt head and this transmission. All parts had the star, including the trans filter.
Point is, this transmission(722.358/368, I forget) I have put into my wife’s new 300sdl which I saved from the crusher. It slips in first gear only. And only a majority of the time. When warmed up, sometimes acts normal.
To clears things up, it has a super strong reverse and goes into it right away.
The one variable(I did have to swap the tail housings due to speedometer variations) is that the Bowden cable has a vaccum line coming off of it.
I’ve searched but couldn’t find a definitive answer.

Unfortunately it could be a mechanical problem. Once I can milk it into 2nd, it holds firm through 3rd or 4th gear it holds power no issues. It is a surprisingly strong om603, really ripped up to 80mph

I don’t know if the vacuum line needs to see full vacuum or modulated vaccum like the other side for shift harshness.

I’ll give it another go tomorrow, hoping someone else has run across this
Thanks

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

87 300sdl

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

Side

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

Getting groceries

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

What makes you think the Trans was rebuilt previously?

If it was on my year and model I would think it was a B2 issue. One would think it would have the updated B2 piston bushings (made of nylon/plastic instead of aluminum) and a new seal in it but you never know.
It is possible to put the B2 piston seal in the wrong way.

Then there is also a measurement that needs to be taken to determine the correct sizes of the "Dog Bone"/thrust pin so that the Brake Band will be applied properly.

Does manually shifting it into Low get it to work in low?

Does the Gasoline Transmission have the same Transmission Modulator as the Diesel?

Attached is an image from an ASTG Transmission Manual.

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84 300D, 82 Volvo 244Gl Diesel

It was clearly rebuilt, as was the head. When you looked at the condition of the grimy m103 they were connected to. It was clean and had a silver coating on it much like some heads I've had redone.
The car in question (~92 300E) had many many new parts, all factory parts.

Manually pulling it down into low seems to help sometimes but doesn't wholly alleviate the issue.
It slips past the converter flash point or grab point if I'm not giving it a lot of fuel.
It is propelling itself forward but not how it should, once into second, it grabs and goes like stink.

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

Here is a shot of it going in

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

And one of the old and new when I was swapping the tail housings

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

Turns out it was a 722.321(300sdl) to 722.358(m103) swap

Everything I read points to B2 as well. My only saving grace is that they say the w126 is the only chassis where it is relatively easy to swap out with trans installed. I’ll give it a test run on the smoked out trans out of the car first.
Seems it died due to a febi filter, the epoxy surrounding the element failed and allowed dirty fluid to bypass the filter

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

Unfortunately you cannot check if the length of the thrust piece/Dob Bone is correct by removing the B2 Piston.

When you remove the B2 piston and or the Cover fluid is going to come out.

The lip seal that is inside after you pull the B2 piston out has a lip that is supposed to face out wards. And you should see a white plastic/nylon bushing behind the seal.

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84 300D, 82 Volvo 244Gl Diesel

Since people rarely update the outcomes to problems:
I was able to dig back into it today, pulled the piston out, all looked good, nylon bushing behind the seal, no noticeable or abnormal wear. The b2 band moved quite a bit, maybe 3/8”
Pulled the b2 piston on the trashed trans and it was a similar situation(in terms of the distance the band(where the dog bone engages it) moved when pushed with a Phillips)
The dog bone on the bad trans was a bit longer, so I installed it in place of the shorter one that was previously in it.
Very unscientific, no measurements were taken, but I feel that I had little to lose.

The first time I put it in D, it engaged with authority. And after it warmed up a bit, when I briefly flashed the converter, it really jumped.

Don’t want to jinx myself, but it is looking good so far. I’ve only driven it in the driveway as I’m blocked in atm

Will update later if it grenades or drives fairly normally.
I still need to put a k1 kit in it and or up the line pressure with the modulator as it had a decent flare on the 2-3.

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

After putting a few miles on it, it feels like a normal transmission.
1st gear is strong(seems the longer b2 piston pushrod did the trick) and the 2-3 flare is mostly gone as well
One thing that I noticed when I first pushed in the Piston cover in, it didn’t bounce back and stuck, I could see a bit of the o-ring. I thought that was indicative of not enough pressure if the spring isn’t fully contacting the piston cover

Makes one wonder about the rebuilder and whether that was the reason that 300E was junked...

Fingers crossed this trans holds for a few years

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate

The measurement with to find out if you need a different sized dog bone is done with the valve body off and the B2 piston and all parts assembles. There is a poor diagram in the ASTG transmission manual showing a screwdriver pushing or prying on something and a Vernier Caliper used to take the measurement.

Thanks for posting the results as it is not a common issue.

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84 300D, 82 Volvo 244Gl Diesel

One other thing to note, more would know this over in tech help:
The additional vacuum line(otherwise the Gasser 722.3xx is identical To the diesel 722.3xx variants aside from stall speed and ratio variations) which comes from the Bowden cable housing, it is an interruption in the cable signal for the cat converter to heat up quicker, it makes the car hang up in second gear for ~45 seconds when it is cold, then the vacuum is switched off and normal shifting functions resume.
Just an emissions device like the air pumps
I’ll likely cap it off to keep junk out but I have it vented to atmosphere atm

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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate