Taiwanese

2003 C230 sedan
85k miles

Radiator was cracked internally at 60k miles so transmission fluid and coolant was mixed. Replaced transmission fluid and flushed both transmission and cooling system.

Now as I slow down for a traffic light and the light turns green, I sometimes will feel a jerk speed up from 15-20 mph. It happens almost every time. I have since flush transmission fluid and new filter two times. The problem is still there.

Any thoughts?

Thanks.

LexBrett2

Try sea foam transtune, it worked for me. I think you have a sticking valve body. Just flushing doesn't always do it. Please read my recent my post on transtune!

Taiwanese

Tried Sea Foam Trans Tune. Did not help.

I notice there is Hydra Trans Tune and Trans Tune. Different product?

LexBrett2

How did you use the transtune? Put the full bottle on dipstick and run for at least 100 miles. Then drain and refill to proper level. Make sure not to overfil.

Other shifting problems seem to manifest from 3 causes: bad shifter from coffee spills, leaking gasket in 13 pin conductor, and a bad conductor plate.

There are some very useful videos on YouTube about this very topic. I may have gotten lucky using the transtune, because it's a night and day improvement in shifting. Especially in the cold. Planning to check if there is a leak coming from 13 pin connector as well as full fluid and filter change.

Feel free to message if you have questions.,

johnng117

If coolant entered your transmission it's a good chance that your transmission needs a rebuild or it could be certified damaged.
If your lucky changing the 3 solenoids can solve your problem.

Taiwanese

So far I have driven about 100 miles. My understanding is that Trans Tune can be left in the transmission.



Thanks and I will talk to my shop guy.