tranny question..... 95 s320 - PeachParts Mercedes-Benz Forum

amosfella · #1 06-29-2009, 05:29 AM

I have been having a few hard shifts lately, and have been wondering if it's the trans piston. probably the b2 IIRC. Does any one know what that part is in particualr called??
Also, just for giggles, could one get a 722.6 trans and put it into that car without major problems??? It would be nice to have that upgrade....

mbdoc · #2 06-29-2009, 08:05 AM

The B2 band engages in 1st gear & doesn't dis-engage until 4th gear.

When does the hard shifting occur ?

The only way to get a 722.6 is by buying a 1997 or later car.

amosfella · #3 06-29-2009, 01:44 PM

hard shifting occurs when the car is pretty warm, and I'm driving it a bit aggressively. This includes using the kick down. when I let off the kickdown, she will start shifting hard. When the trans cools off, it's fine again....
Sometimes, when the car has sat for a few days, it won't want to shift out of 2nd gear until the engine has been reved up to about 3500 rpm. Then the trans will shift, and be fine until I use the kickdown again...
You're saying that installing a 722.6 trans is not possible?? What would the reason for that be??

mbdoc · #4 06-29-2009, 02:13 PM

There is acomputer that controlls kick-down & 4-5th shifting. Try having codes read from that module.

The 722.6 is fully electronic & needs signals from traction system & engine system & those systems didn't happen until 1997 on that car.

Would cost $$$$$$ more that swapping cars!!

amosfella · #5 06-29-2009, 02:19 PM

I guess I"ll have to make the blinker style code reader a second time.... First one was a bust....

amosfella · #6 08-23-2009, 01:10 AM

I put the code scanner on the car, and got nothing. I used the OBD2 port. seems to me that the hard shifting is from 2-3. IIRC... I was wondering about the vaccum modulator, or the B-2 piston... (I"m assuming the 722.5 has a b2 piston)
If I have to order one, what is it called??

mbdoc · #7 08-24-2009, 08:10 AM

Reading the tranny code on that car requires a MB scanner connected to the 38 pin connector underhood.

amosfella · #8 11-11-2009, 11:05 PM

I'm looking at a readout that I had made a while ago. Wonder if it has the codes needed.
DM P1700
EA 112
ASR 030
ASR 033

These came from a merc shop about the time the problem started. I wasn't told it was a problem...

amosfella · #9 11-14-2009, 12:57 PM

Bump

amosfella · #10 03-13-2010, 12:20 AM

After I posted last in this thread, The problem seemed to go away. Today, I was out driving, and it started doing the shift flare things again. It's for sure between 2 and 3 gear.
Now, I've got a rattle that's similar to the rattle that my 126 had when the shift linkage bushing was worn out. Could that be a cause of 2-3 shift flare??
Also, the problem seemed to completely disappear after the outside temps got down to about 3-5 degrees C outside.
I have a blinker tool on order as my last 2 attempts have not produced a working model. When it gets here, what pins do I need to check, and how are they numbered??

amosfella · #11 03-14-2010, 06:31 PM

I found out today that the throttle control linkage was out of line, and have adjusted it. we will see in a period of more extended driving if it has helped any...

amosfella · #12 07-14-2010, 12:30 PM

Didn't help, still flares from 2-3. Does this mean that I have to redo the K1 spring in the trans, or adjust the modulator??