Quote:
Originally Posted by M_G
From what I know the 722.5 transmission is derivated from 722.3/4 transmissions by adding electronically controlled 5th gear. Is this correct?
Now is there such thing as completely hydraulically controlled 722.5 transmission, with other words with NO electronic controlled fifth gear? And if such animal exist, what is the part # and in which models it could be found, as well as what is the main visual/visible difference between both transmissions?
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My understanding is that it's more electrically controlled than electronic. I say that because the box is basically hydraulic but they added an 'overdrive' that's controlled by a switching mechanism that's in turn controlled by a thing called the MAS box that also contains the fuel pump relay.
This MAS box does have some rudimentary intelligence but it's far from the true electronic control of the 722.6 box. That said, there are electronic issues. In my case, the 722.5 box refused to spend any time in 4th gear and it's overall responses became very sluggish. This was solved completely by clearing the stored fault codes that had somehow put the system into a sort of 'safe mode'. This followed the replacement of the engine and gearbox mounts but I cannot be sure of the exact cause of the problem.
So, the answer to your question is, "No, there is not a 722.5 box that's 100% hydraulic".
My question is, "Are you having a problem with a 722.5? If so, what?"
Regarding the models, mine is a W124 300CE-24 Sportline. The box was also fitted in the W129 SLs and, probably, in other 300-24s.
Any old way, there will be someone along fairly soon who will give a more detailed comment. Failing that, I recommend that you go to some of the UK boards because the 722.5 box, I think, was much more common in Europe. And if your German is up to it, try Deutschland.
Bon courage.
RayH