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Old 02-02-2003, 03:13 PM
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How tough is it to swap out the trans modulator in a 116?

I have a 450SEL that shifts hard between 1st and 2nd.

I'm assuming it's either the modulator, or the vacuum going to the modulator.

Because the modulator probably has never been replaced, I was thinking of just swapping in a new one. How hard is this to do? I can't find any info on Mercedes trannys.

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Old 02-02-2003, 05:56 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I would try adjusting it first. Unless fluid comes out when you remove the hollow bolt.

The original modulators had a steel line to them with a banjo fitting and hollow bolt. Remove the hollow bolt and use an allen wrench down the middle to adjust. Try a turn counterclockwise.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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