Brand New Mercedes 722.3 trans problems
 

I just installed a brand new from Mercedes 722.3 transmission.

I cannot feel the shifts at all. It flairs for a few seconds from 2nd to 3rd.

First thing in the morning on my slight incline in my driveway it creeps up the hill. If I did it in reverse it flies up.

It seems to be shifting into 4 at about 30mph. Manually shifting it works fine. Reverse is strong.

I have adjusted the vcv valve as well as the bowden cable to factory spec.

I do not know the modulating pressure.

Any help would be appreciated.

i think you have to adjust the vac modulator i dont know if they come adjusted from the factory.

turn it clockwise 2 or 3 clicks. or if you have the new mod where you dont have to pull the pin then just turn it up a bit.

i bet that solves the problem

lemme know wat happens ill be done with the same install tonight

Thanks I’ll let you know.

So I took it back to the shop that installed it for me armed with the pages from the factory manual regarding set-up, they were able to adjust the modulating pressure properly. They discovered my VCV on the side of the injection pump was not functioning properly and replaced it with a slightly used one that they had in stock.
Shifts now like it should.
I ordered a new VCV from Mercedes that I will be installing.

Ive been thinking about this, for the past couple days.

Do you suspect that you unfortunately replaced the whole transmission when really all you needed to replace was the VCV??

I hope not. Vehicle has 290,000 miles on it So it was probably time anyway. I was able to keep my old transmission so perhaps I will rebuild it I don’t have it for back up.

Additionally the front part of the transmission was pouring out fluid and I think the front main pump was about to go as there were pieces of aluminum as well as the shimmering of aluminum in the oil when I emptied the pan.