tranny slipping or flaring?

[biobenz240d]

My '83 300d turbo had a bad vac modulator, that I replaced. The trans shifts from 1-2 with the lift of my foot , then when in 2nd it will suddenly jump out of gear or slip. I'll let off the throttle and it will go back into 2nd . After a little acceleration it will slip or jump out of gear again. Once it gets into 3rd then 4th it seems ok. Would a superior spring kit help this problem or is 2nd gear going?

[dkveuro]

You need to make sure you have the correct modulator pressure first.
Call Mercedes with your tranny number...stamped on body just above pan gasket.

It sound like you have too much vacume to the modulator at small throttle openings and incorrect at other positions.

The vacume to the transmission is infinitely adjustable at the i/p as long as the correct restrictors are at the vac' ports and the throttle control on the i/p is operating....along with correct lay out of vac' hoses too.

Steve at Continental Imports in Florida has a blow by blow 'How To' on this system.

Here's the link.

http://www.continentalimports.com/ser_ic20242.html


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[biobenz240d]

Thanks for the link . I'll look into it soon as the temperature gets above freezing.

[Brian Carlton]

Originally Posted by biobenz240d

Thanks for the link . I'll look into it soon as the temperature gets above freezing.

Yes, DK is correct. That vehicle can be adjusted for vacuum to the transmission.

If you can.........connect a Mityvac to the transmission line to the modulator and see what the vacuum is at idle.

If it's too high..........it can be adjusted downward to improve that situation.

The Superior kit has also proven it's worth for several members on a flaring 2-3.........which is what you currently have.