722.6xx differences??

[Erixx]

Hello,

I have come to conclusion that my 722.624 gearbox is toast (coolant in gearbox oil which is fixed now and 170k miles in a high powered V8 engine, W210 E55)

So the question is, how interchangeable are the 722.6xx boxes? I know facelift models of the W210 has a different gear selector(tiptronic right?) than the pre-facelift.

But other than that whats the difference? Im guessing them 8´s have some different internals than the 4´s and 6´s because of the up in power.
And the rear diff ratio is also different but how does that affect the gearbox if I keep the TCU that sits in the car now?

// erixx

 

[LostKiwi]

There are a number of variations internally to handle more or less torque depending on application. This is managed through different numbers of clutch plates int eh clutch packs and different thicknesses of plates. There are also different ratios for each application so how interchangeable? Not very....

 

[Erixx]

Okay are you sure the AMG ones have different than the non AMG V8s?
As for the diff ratio, isn´t it just coding in the TCU thats different? Otherwise they would just only change more internals on the gearbox for better acceleration etc

 

[LostKiwi]

Without looking I don't know what difference there is between AMG/non-AMG. You asked about 722.6xx boxes which are used in C180s through to SL600s and SL55s.
On the side of the box is a WAxxx number which shows the torque rating. I know that normally aspirated V8s use the WA580 variant but that there are also WA900 variants used further up the range and WA330 variants lower down the range.

 

[Erixx]

Maybe I was a bit confusing but the car in question is a E55 AMG, so a gearbox that would fit that car would be nice (more than 722.624 which is in the car now)

Okey so all V8’s use the same type, WA580?

Is it stated somewhere on the car or can I fins that information about a cars gearbox somwhere else? (Can look at my local scrapeyards for any 430/500)

 

[LostKiwi]

WA580 is the descriptor for the internal clutches/torque handling capability.
i.e it specified for 580Nm. This doesn't mean to say you can use any WA580 box as there will be differences - for example does it have an electronic interlock to the gearshift or a mechanical one? Ratios may not be the same. There are bound to be other small differences that may or may not matter. This is why the re are so many variants.

 

[Erixx]

But a WA580 from a E430 should work? Pretty high power as well as torque.

My car has mechanical lock and ofc I will buy one that has that too. The connection to the propshaft is also different on some version but I will check that too so it fits.
Are the internal gear ratios different or just the rear differential? Would make more sense if only the diff was different but that is programmed into the TCU.

I have actually checked EPC and can´t find any internal differences there (compared between V8 models).

Has anyone tried putting another gearbox than the exact same that was in the car with problems? (more than the obvious connetions and interlock)

 

[LostKiwi]

722.624 is SL500.
Yours should be 722.636 which is also shared by CLK55.

On that basis you can swap around but it may not work as you have found out.

 

[Erixx]

From what I have found pre facelift E55´s have the 722.624 which only late SL500 have.
But after some search these boxes have the same internals as mine:
722.620/621/624/626/627 628/630/633/636/666
All of them are from either heavy V8s or V12s.