E300DT - 722.608 -> 722.607 Swap - PeachParts Mercedes-Benz Forum

mbolton1990 · #1 05-30-2018, 10:34 PM

K,
after doing some researching into this for all intentions and purposes the 607 appears to be identical to the 608. Same # of clutch packs in all gears, same gear ratios, and same gearbox size (small NAG).. the only difference I'm seeing between the two is the bellhousing difference. (easy to swap, plus be a good time to check the functionality of the sprags)

Anything I'm missing here? Will the TCM be happy?
If my research appears to be correct it should function fine, but would like a second opinion.

Cheers,
matt

mbolton1990 · #2 05-30-2018, 10:48 PM

Next question is the 608 TC the same as the 607?
Kinda looking like it isn't from what I'm seeing online, kinda hard to find a solid source of info!

Edit: Appears to be the same. Daaco MC18S part interchange verifies this.

jay_bob · #3 05-31-2018, 07:50 AM

Everything I have read about the 722.6 is that it only has passive components inside (sensors and solenoids). The interface to the TCM (up in the control box in the engine bay) is the sensor inputs and solenoid outputs. Therefore the TCM does not care which specific transmission it is connected with.

While you have the transmission on the bench it would be worthwhile to go ahead and renew the conductor plate.

Contrast with the 722.9 where the TCM is built into the conductor plate. It requires dealer intervention to replace and it is $$$$. And it is married to that particular vehicle so DIY swaps are out of the question.

mbolton1990 · #4 05-31-2018, 11:47 AM

Awesome!
Thanks for the advice, this is looking really good then.
Everything I'm looking into is saying this should work, I'm just worried about the small details now..

You don't think anything could pop up by me putting a 2000+ 607 in? I know where a wrecked E320 is that's super clean but it's a 2001. Good news is they fixed alot of issues with the 722.6 by then and it has a few updates. Should be a better box!

Cheers and thanks,
matt

97 SL320 · #5 05-31-2018, 04:33 PM

The early 722.6 ( 1996 ) had a different valve body and requires a different TCM. The valve body continued to change here and there over the next few years. Mix matching the valve body and TCM will lead to shifting issues.

Also, early trans ( to 1998 ? ) had an external cable to unlock the shifter, later cars used a shifter lock in the car. Even later cars went to a actuator on the trans to select gears / park.

mbolton1990 · #6 06-01-2018, 04:10 PM

Ahh so the plot thickens.
What if I grabbed the entire shifter assembly out of the 2001 e320? Think I'd be sorted then?

97 SL320 · #7 06-01-2018, 09:00 PM

The wiring to the early and late shifter is different as is the TCM wiring so making the swap is a no go. The TCM to ECM communication standards might be different too.

It would help to post model years as the .xxx numbers get cryptic and post engine size / type too.

The bell housing change isn't difficult however, it involves cracking the trans open. The pump is attached to the bell housing and the whole gear train is stacked up onto the pump / bell housing. Building these trans is very easy but changing just the bell housing is more involved.

mbolton1990 · #8 06-02-2018, 01:03 PM

Not good.
What if I sourced a same year trans from a wrecked E320? I'm looking on this and seeing where they made multiple updates to the valvebody throughout the span also.. sometimes as many as a change a month. This is looking harder than I thought.

I'd attempt a rebuild, but I've personally never done one before. I know it could be simple, but with my luck it'd be a catastrophe lol.

Thanks again for everything.

EDIT: I looked online and it's looking like all the 98-01 607 transmissions are interchangeable. Think this might only pertain to the older pre-98/post-01 cars?

97 SL320 · #9 06-02-2018, 09:39 PM

Quote:

Originally Posted by mbolton1990

Not good.
What if I sourced a same year trans from a wrecked E320?

Same year as what? In a previous post I asked for specific years rather than cryptic .xxx

Quote:

Originally Posted by mbolton1990

I'm looking on this and seeing where they made multiple updates to the valvebody throughout the span also.. sometimes as many as a change a month. This is looking harder than I thought.

Mid calendar year 96, there were major changes to the valve body / TCM. I'm reasonable sure after that, valve body changes didn't require a TCM change but don't quote me in that.

Quote:

Originally Posted by mbolton1990

I'd attempt a rebuild, but I've personally never done one before. I know it could be simple, but with my luck it'd be a catastrophe lol.

Taking apart and rebuilding the 722.6 isn't difficult however, finding what caused a part to fail and correcting it is critical. Valve bodies can wear out causing friction material to fail.

The real question is :
" What is the current trans doing that you don't like? "

Quote:

Originally Posted by mbolton1990

Thanks again for everything.

EDIT: I looked online and it's looking like all the 98-01 607 transmissions are interchangeable. Think this might only pertain to the older pre-98/post-01 cars?

Have a look at car-part.com this is a search of participating salvage yards. Interchange info can be inferred by entering your car and looking at donor cars.

MCallahan · #10 06-03-2018, 01:00 AM

Highly recommend you give Marc at Sun Valley a holler and just get a rebuild. No question as to whether it fits, he matches by VIN. By the time you buy a new master trans kit with clutches, bands and all the goodies, plus a converter, you are only about $500 from Marcs rebuild, at least that was the case with my 92 300TE trans. If any internal components like drums, pump, bearings, etc... are bad, you can easily spend more on your own rebuild than Marc will charge you for a fresh rebuild shipped to your door. He also runs all his rebuilds on a dyno to test and adjust them before they go out. It's not cheap, but it sure is nice to pull the old trans, put the rebuild in and not have to worry about it again.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode