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93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
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Hi.

Will SL600 V12 transmission fit V8 SL500?
Mechanically they are Identical inside with same amount of frictions. The components are of the same thickness.

You did not specify what years:

93-95 have the one piece 722.3 Transmission
One cannot make a direct swap with a 500 as the bell housing is different in engine outline. The strength of the housing from one to the other is the same.

The output yoke is four-point on the V12, yet the 500 upto 93 were four point after 93 they are three-point.

96-2002 have the two piece 722.6 which one can swap bell housings.

Same here, the 500 and 600 722.6 are identical on the inside. On the outside the bell housing is different from a 500, yet the 500 has to two engine styles(M119 and M113) with different bell housings. The 600 does not exhibit any extra strength, All three different bell housings are of the same thickness. The yokes are different on the two transmissions, but they can be swapped. The Torque Converter(TC) on 722.6 may have a different bolt pattern from a 600 to 500.

One in essence can use a 500 722.6, and put it in a 600. Only one needs to swap bell housing. Swap yokes, and swap TC's too, and one has a 600 tranny from a 500 tranny, but I would recomend getting a rebuilt TC from CVC or Mercedes as any 722.6 TC has frictions inside, and they wear-out. At typical rebuilt TC is about $300 with core..

Hope it answers your tranny questions..

Martin
 

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93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
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On any 722.6 for a R129, or any 90's 722.6 is to replace the regulation spring every 100k miles to be safe in my book as the spring breaks and shrinks..



Though some of the early 2000 722.6's suffered from this in cold weather:


95-97 valve body builds had many changes in the 722.6 transmission. In some late model 97 build valve bodies one can swap out the entire valve body with a +2000 unit. All +2000 unit eliminated the regulation spring, and have a TC valve which one can upgrade:


My 98 S500 has 2004 valve body works way better, but one has to do a trial and error to test as some 97's it will not work. 95-early97 can only work in that year range due to the TCM(transmission computer), but that does not mean you cannot use a 99-02 transmission, but with 95-early 97 valve body in a 96 car, yet providing you have the correct bell housing and output yoke.

The flaw is 95-to early97 car with a +98 valve body is one has a 5 to 10 second delay when you come off a dead stop.


Most if not all shops do not like to do trial and error repairs, so this you either DIY to do trail and error testing. One can get valve bodies from any late model car for under $100 at the self serve junk yards. It does not matter what model.

Hope it helps,

Martin
 

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93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
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It is really Identical to the 500 and 600 from the inside-clutch pack baskets are the same size, and count are the same as 500/600 722.6. The obvious change is they used the "blue-cap" solenoids for regulation, but you need to be in the same year to take advantage of the transmission as you need the TCM to be in the similar for the CAN bus to work well, or forgo the TCM, and you will have some hard up-shifts and very hard-shifts at all speeds. The later AMGs went with more oil cooling passages on some of the frictions, but one can add that style of friction to any 722.6, and all AMGs have four-point output yoke.

Hope it helps,

Martin
 

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Discussion Starter #12
Thanks. So, basically there is nothing much to upgrade besides electronic tuning chip.
 

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93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
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8,109 Posts
Thanks. So, basically there is nothing much to upgrade besides electronic tuning chip.
You are welcome, yet you may have better luck playing with all shift points, and even incorporate a paddle shift to any R129 that DID NOT come with 722.6 as their are commercial 722.6 TCU's and even a DIY 722.6 TCU... The W126 diesel guys are doing this to rid themselves from the low-life 722.3's.

Follow the links, and read all about it...


This is a commitment, but guys are doing this. Those diesel guys are bunch "knuckle-heads". One here in Benzworld would love have diesel lawn mower.....

All the best,

Martin
 
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