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#1
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W124 autom. tranny
Greetings,
concerned how much life is left in my autom. transmission of my 91 300D 2.5T. The original unit - 722.418 is still in the car - current mileage 136K. Can buy a used one fm an 87 300D sedan for $ 200.- - mileage unknown. Prior to installing would have it checked out/overhauled by a tranny shop. Intend to keep this car for a few more years and therefore wondering whether this a good way to go. Will the tranny out of the 87 300D fit and work correctly in the W124.128? Has anybody done this change? Thanks for your help. PS searched the Forum but could not finds answers |
#2
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Not many miles on your car what makes you think you need another transmission? Are you having issues currently?
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#3
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That would be extremely low miles for a 722.4 to have problems. What's the history of fluid and filter changes?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#4
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W124.128 tranny
Many thanks for your responses. I am the third owner of this car and have complete service records. I have to say that PO drove the car rersponsible. First owner had the car 15 years. The tranny fluid was changed at regular intervals and at present I have Amsol ATF in there.
I know MB trannies don't shift as smoothly as the ones from newer cars but feel the one in my car is slowly getting worse. Still shifts without delay from P to R or N and I take this as a good sign. I am the only who is driving this car and most of the time I am not in a rush anymore. Will assume, tranny will last quite a bit longer. Cheers |
#5
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If it's shifting too firm, start checking rubber vacuum fittings under the hood. As these age and crack they leak and low vacuum is known to cause firm/abrupt shifts. If the rubber vacuum fittings look spongey, feel soft, or look alligatored, plan on replacing them.
Automatics with problems tend to have mushy shifts, flares between gears, noises, delays, dropping out of gear, and other symptoms, not usually firm shifts.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) |
#6
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I've always found hard/abrupt shifts to be vacuum related.
One thing you might want to pursue is simplifying the vacuum system: first by converting to a pressure wastegate, thereby eliminating all the vacuum stuff on the passenger side; then by other odds and ends.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#7
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True, harsh shifts are often vacuum, but in your car also ALDA or boost/wastegate. If the car isn't producing the power that it is supposed to, the transmission does not know it and adjusts the shift to where the pedal is, ... which results in harsh upshifts.
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Gone to the dark side - Jeff |
#8
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thanks for the advice - will check the vacuum lines when the car is on the hoist again
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#9
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First off, your transmission has very low mileage. My 190DT, which has almost exactly the same drivetrain, made 320K miles before the transmission gave out. I wouldn't "simplify" the vacuum system, it's all there for a purpose and it all works with simple maintenance. Nor is it an Alda or wastegate problem, that's just pure nonsense. But yes, a vacuum leak somewhere can cause shift problems, so it's worth going through the vacuum system with a Mityvac. If the shifting is firm in all gears, backing off the modulator a bit may be all that's needed. Do this using a pressure gauge following the factory procedures. If harsh shifting is only happening in one range, then replacing the associated accumulator spring might help. K1 accumulator affects shift quality 2-3. K2 affects 3-4.
As for the transmission from the '87, it's a different box altogether. It would be a 722.3, not a 722.4. Since you were planning to have it overhauled anyway, what would be the point? If your present transmission breaks, have it overhauled and go another 300K miles. That's what I did. |
#10
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Simplifying the vacuum system has many advantages. As these cars age, there are all sorts of vacuum gremlins that can arise...boost issues that can be very difficult to diagnose.
Here's one person's approach: https://lh5.googleusercontent.com/-9cBEIu4dcas/UAZEQ4LzTiI/AAAAAAAABpI/Xf0tT4reobU/s576/60X%2520Engine%2520Vacuum.jpg
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife |
#11
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My trans was still going strong on my '95 E300D at 467K. Original trans. Only problem was a 2-3 flare which was manageable by backing off slightly just before the shift, which I had been doing for at least 100K.
Rgds, Chris W. former '95 E300D, 467K, gone to new home
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Objects in closer are mirror than they appear. |
#12
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My '96 E300D, which also uses the 722.4 transmission, was rebuilt due to a leak at 250,000 miles. The mechanic who did the work said the transmission had another 50,000 miles in it at that time. So your car, Diseasel, is less than halfway there. Make sure the vacuum connections are in good shape and enjoy the car.
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#13
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A lot of these Mercedes automatics become problematic. In any of mine with automatics I have no reason to think the fluid and filters where changed out at reasonable intervals before I purchased them. At the same time maybe one was but again I doubt it.
Is it the additive packages in the fluid that go bad or get used up requiring the to me frequent recommended changes? The filter should be catching clutch wear particles. I think the manufacture likes changes every thirty thousand miles. I assume they have a reason. How much additional life the recommended change intervals might allow is also an unknown. Also the wide range of failure complaints at different reported milages may be due to odometer tampering. Certainly up to 1986 models. I still see all too many of these cars for sale where the indicated claimed milage is a joke. At least compared to the indicators of overall condition of the vehicle. . Last edited by barry12345; 07-04-2016 at 04:56 PM. |
#14
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15,000, not 30,000 miles
Quote:
Once that problem was fixed, the car's been running fine and I have 205k on it now. |
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