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#1
03-30-2016, 08:40 PM
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190e 300e 4 speed trany vac modulator difference?
So I am swapping the 4 speed 422.410 auto transmission out of my 1986 2.3 -16v auto from the US with a good low mileage 4 speed auto tranny from a 1990 2.5-16v euro car. Should be basically the same transmission Right? So most of the parts I am replacing, seals and gaskets and flex disks to install this are the same part number as my 2.3-16 US. BUT the 2.3 US car has a green vacuum modulator on it and the parts catalogs show a green one, however the Euro 2.5-16v from 1990 has a tan or beige plastic vacuum modulator on it. I wanted to put a new on on since it is easy to do now and will have to be reset anyhow. Pulling up the VIN shows this modulator is part number 1262702479, which is discontinued and I think replaced with 1262708979. This shows to be the modulator for most 1990 2.6 190E. Also there is a red one that is part number 126-270-90-79 for these cars. Which one should I use and what difference does it make? My 2.3-16v uses the green one, can I just use that one or do I need to find and aftermarket tan one?
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Christopher Henkel 1990 190E 2.6 - Arctic white SOLD 1986 190E-16v - Blauswartze 1993 300CE - SOLD 2003 W208 CLK 320 Cabriolet - Magma Red 
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#3
03-30-2016, 09:38 PM
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explains some of the mystery
It does help a bit. It does show that the modulators seem to meet different PSI requirements and they seem to be matched with transmission numbers not the car or model. Since my Euro transmission is a 722.417 it is not on the list, but if it had a brown modulator, it should probably keep the brown one since the modulator seems to meet a pressure need. not a model or engine need. Thanks for the info.
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Christopher Henkel 1990 190E 2.6 - Arctic white SOLD 1986 190E-16v - Blauswartze 1993 300CE - SOLD 2003 W208 CLK 320 Cabriolet - Magma Red
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#4
03-30-2016, 10:30 PM
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The attached doc is what I was looking for, this will help you. 722.417 was used on the '87 190D turbo in the US. If you ask the dealer for a modulator for that car, you should be OK.
Last edited by Mxfrank; 03-30-2016 at 11:16 PM.
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#5
03-30-2016, 11:26 PM
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Excellent resource for transmission modulators
Awesome! That is what I needed. Thanks alot. I think that pretty much shows that I need to keep the "natural" or tan plastic modulator on the 722.417 transmission I am going to install. It shows what to set it to pressure wise to start out also. Great. Thanks again.
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Christopher Henkel 1990 190E 2.6 - Arctic white SOLD 1986 190E-16v - Blauswartze 1993 300CE - SOLD 2003 W208 CLK 320 Cabriolet - Magma Red
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#6
03-30-2016, 11:29 PM
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I was wondering if the 722.417 was ever used in the US. The diesel turbo huh. Weird. At least it shoes that the parts are available and not really any different. I am seeing that the rebuild kits are basically the same, I am guessing that the valve body must be the different piece in the transmissions. Thanks again. Good work!
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Christopher Henkel 1990 190E 2.6 - Arctic white SOLD 1986 190E-16v - Blauswartze 1993 300CE - SOLD 2003 W208 CLK 320 Cabriolet - Magma Red
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