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  #1  
Old 09-13-2020, 12:38 PM
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722.4 transmission

does anyone know, generally, how long these transmissions last? Can they last to 150/200,000 miles? and what problems are they likely to have and how to fix them…
Thanks everyone

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Old 09-13-2020, 06:35 PM
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They can make it beyond 300-400k Miles not km
Provided the fluid and filters were changed at some point.
I have had quite a few that held up at those mileages
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Old 09-13-2020, 11:54 PM
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thanks bigpanda 16, mine has 325K (miles) but is getting worse & worse...no more 1st, lots of flair & slip on the way to 4th..,once cruising at speed is ok. dont know what to do! a "B2" band was mentioned, i can do some routine maintenance but rebuilding a transmission is a bit beyond me at present😳
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Old 09-14-2020, 11:05 AM
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I have 2 cars with the 722.4, a w123 and a w126. Both have the 617.952 engine. I've read that the 722.4 is considered by many to not be as robust as the 722.3 when mated to the diesel engine.

My '85 300SD has 160,000 miles and has had no major transmission work, just regular fluid and filter changes. This car was babied by its two previous owners. Still shifts well.

My '85 300D has 300,000+ miles. This car was also well maintained by its previous owners, but obviously used more. In 1998, at 178,616 miles, it was taken to the dealership because of "a leak at front pump and modulator, and a clunk when placing transmission in reverse or drive." The invoice states "R&R/D&A Transmission, replace K1, K2, LB3. Replace check ball at front pump. Install restrictor for reverse." The total cost was $1,765.50. Still shifts well but currently need to diagnose a very slow leak.

The above is just anecdotal stuff to consider. I would imagine mostly it's about how well the transmission was maintained. If yours has traveled in excess of 300,000 miles, I'd be thinking you and the previous owners got their money's worth out of that unit and be planning on getting it rebuilt. But I'm definitely not as adventurous a DIYer as a lot of folks here are!
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'06 Mercedes E350 station wagon (silver/black)
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'85 Mercedes 300SD (smoke silver/burgundy)
'79 Cadillac Sedan DeVille

'05 Toyota Camry (because always running is nice)

'85 Mercedes 300D sold back to orig. owner 8-1-06
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Last edited by Volvo Diesel; 09-14-2020 at 12:52 PM.
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Old 09-14-2020, 03:28 PM
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me too!
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Old 09-15-2020, 05:40 PM
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Quote:
Originally Posted by Ka-T View Post
thanks bigpanda 16, mine has 325K (miles) but is getting worse & worse...no more 1st, lots of flair & slip on the way to 4th..,once cruising at speed is ok. dont know what to do! a "B2" band was mentioned, i can do some routine maintenance but rebuilding a transmission is a bit beyond me at present��
Consider, instead, going to a pick and pull and grabbing a 722.6 (5 speed) from a whole bunch of models from '96 on: https://agens-bv.nl/wp-content/uploads/2018/11/Mercedes-Benz-722.6-transmission-application-guide-1-2.pdf

Installation discussed here: https://www.benzworld.org/threads/722-6-installed-in-300sd-with-om617.3042119/

reliability discussed here: https://www.reddit.com/r/mercedes/comments/4yd8zj/5gtronic_7226_transmission_how_long_do_they/ Supposedly one of the most durable MB transmissions evah.
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Old 10-06-2020, 09:13 PM
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wow! Thank you so much for the great idea
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Old 10-06-2020, 10:42 PM
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but my car has a 606 engine... think it'll still work?

thx
"Installation discussed here: https://www.benzworld.org/threads/722-6-installed-in-300sd-with-om617.3042119/"
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Old 10-06-2020, 10:49 PM
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On the other hand, the article mentioned making an adapter from the 606 bell housing … But mine IS a 606 so it should be easier🤔
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  #10  
Old 10-08-2020, 12:17 PM
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722.4 is almost the same as 722.3
They last over 200k miles, but there are some wear items that you can't avoid with fluid changes: seals and friction discs.
At some point, you will have to open it up and replace them. The rest may function well.
Sometimes a piston in valve body can break, but they are relatively simple to replace.

And don't be fooled, 722.6 requires special interface which is $1000 itself

If you intend to swap from .4 to .3, bear in mind you need to swap your driveshaft, flex discs, bowden cable, kickdown switch, dipstick tube and atf cooler lines.

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