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  #1  
Old 04-08-2015, 02:14 AM
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Should i expect the this transmission to last much longer?

in my 1998 e300d, it has 227k, and I recently change the transmission fluid, but I am not sure it had ever been done before. Both before and after changing the fluid it will not take off from a stop smoothly when cold (instead it will rev up slightly then clunk into gear), and it whines loudly when shifting until it warms up. Once its warm its mostly fine, although sometimes it will flare a little bit when it kicks down when accelerating hard.

I used the proper shell ATF and real Mercedes filter and made sure to get the fluid level right, and it shifts better warm than it did before the fluid change, but its still weird when its cold. If there is a reasonable chance the car might last another 50k miles or more I need to spend $600 on tires and an alignment, another few hundred on shocks, etc, but if the transmission likely won't make it another 10k its not worth it, because between a transmission rebuild and the other stuff it needs it wouldn't be worth fixing. Any thoughts or experiences with those transmissions would be helpful.

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  #2  
Old 04-08-2015, 05:09 AM
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Has the transmission been rebuilt yet or is it the original?
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  #3  
Old 04-08-2015, 06:43 AM
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No direct exp., but my pre-purchase reading shows this as a reported problem. The DIY fix for this and other shift issues is a new or known good conductor plate-$300 on up. BTW my 99 does this as well on occasion. It clear when it will happen doesnt shift out of 1st, so I stop run thru the gears then go again which has worked for me
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  #4  
Old 04-08-2015, 06:56 AM
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You can buy a new conductor plate for $155. FWIW Kent Bergsma recommends replacing these on higher mileage (100-150k) 722.6 trannies just on principle because of the variety of issues they can cause. Next time I service my 99 at around 220k miles I may do this.
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Last edited by shertex; 04-09-2015 at 03:32 PM.
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  #5  
Old 04-08-2015, 10:55 AM
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how much fluid was changed out?
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  #6  
Old 04-08-2015, 11:10 AM
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Good question...if it's a 98, it sill has the torque converter drain plug. So you can replace close to 8 quarts of fluid. If all you did was drain the pan you might consider draining and filling several more times to purify the fluid.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife
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  #7  
Old 04-08-2015, 12:18 PM
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Half dirty and half good fluid wouldn't cause the issue i wouldn't think. I'd try the conductor plate and when you do drain all the fluid and put in fresh. Did you check the adapter plug and make sure fluid isn't leaking out that?

If you do get a conductor plate and it doesn't work for you i may buy it from you. i have a 1998 that is my friends that is doing this type of thing. I got him an adapter plug to put in first and he hasn't done it yet.
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Old 04-08-2015, 12:18 PM
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Quote:
Originally Posted by shertex View Post
You can buy a new conductor plate for $155. FWIW Kent Bergsma recommends replacing these on higher mileage (100-150k) 722.6 trannies just on principle because the the variety of issues they can cause. Next time I service my 99 at around 220k miles I may do this.
Where do you get these for 155?
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Old 04-08-2015, 12:19 PM
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The other issue I see here is the mileage of the unit, about 220K miles is usually the limit where the frictions are quite worn down.



btw - the shop on this website sells the electrics plate for about 186/-

you can shop around and find it - you can even go ask the dodge/chrysler dealer for it. The old charger/magnum/300 uses it too.
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  #10  
Old 04-08-2015, 12:28 PM
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Did you change filter? Or go to a crappy oil change place.
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Old 04-08-2015, 12:55 PM
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Originally Posted by biopete View Post
Where do you get these for 155?
BMA
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife
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  #12  
Old 04-08-2015, 01:07 PM
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The only real way to determine the life left in one of these thing is to read the "K" values through a STAR setup. This measure the fill times for the various clutches, and is a direct indication of clutch wear. On a 722.6 there are K1, K2, and K3 values, with the scale going from 1 (brand new) to 15 (absolutely worn out). If you're at 13 or more (likely K3 has the highest value), you're not far from needing an overhaul.

I would do at least one more drain/ fill and really get some clean fluid in there, and then maybe change the fluid and filter again in 5-10k miles (let the fresh fluid and its detergents clean things up).

If the K-values are low enough, a conductor plate swap would rule out some issues, and wouldn't be a bad idea.
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Old 04-08-2015, 01:15 PM
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Quote:
Originally Posted by Cloudsurfer View Post
The only real way to determine the life left in one of these thing is to read the "K" values through a STAR setup. This measure the fill times for the various clutches, and is a direct indication of clutch wear. On a 722.6 there are K1, K2, and K3 values, with the scale going from 1 (brand new) to 15 (absolutely worn out). If you're at 13 or more (likely K3 has the highest value), you're not far from needing an overhaul.

I would do at least one more drain/ fill and really get some clean fluid in there, and then maybe change the fluid and filter again in 5-10k miles (let the fresh fluid and its detergents clean things up).

If the K-values are low enough, a conductor plate swap would rule out some issues, and wouldn't be a bad idea.
Nice info. Thanks
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  #14  
Old 04-09-2015, 01:29 AM
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I did drain the torque converter too, and filled it with 7.75 quarts, which it what everything I could find said it should take, and shows full on the dipstick tool. I used shell ATF 134, and Mercedes filter, etc. The car does have somewhat high mileage but I looked at one with 380k when I was looking for this one and it still drove fine, so I figured it would be ok.

If the transmission is too worn out I am going to assume it will be a parts car when it does, this one isn't really in exceptional condition, and I haven't heard anything that makes me think rebuilding one of these transmissions will turn out well.
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  #15  
Old 04-09-2015, 11:11 AM
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Originally Posted by 83w126 View Post
I did drain the torque converter too, and filled it with 7.75 quarts, which it what everything I could find said it should take, and shows full on the dipstick tool. I used shell ATF 134, and Mercedes filter, etc. The car does have somewhat high mileage but I looked at one with 380k when I was looking for this one and it still drove fine, so I figured it would be ok.

If the transmission is too worn out I am going to assume it will be a parts car when it does, this one isn't really in exceptional condition, and I haven't heard anything that makes me think rebuilding one of these transmissions will turn out well.
These transmissions are IMO fantastic, they shift beautifully and can handle a lot of torque. There are some downfalls in the earlier models (like you have), but when addressed with good repairs they come out perfect. Sonnax makes the replacements and also pressure control springs replacements - the torque converter clutches also wear down and now you can buy updated rebuilt torque converters which take care of the cold weather issues and also buzzing/shudder.

The later models have more heavy duty build (needle bearings inplace of bushings).

These trans can be rebuilt and they work very sweet after that. Infact its one of the easy transmissions to build.

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