Fine tuning a transmission involves making pressure and vacuum measurements.

But first I'd be checking fluid level - at the correct temperature

These transmissions are pretty pernickety

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Yep, fluid is perfect. I have a vacuum extractor and set the level exactly to the upper fill line once she was all warmed up from runs up and down the road.

First thing im going to do is swap the modulator with a new one, I noticed the one that's on there now is ever so slightly seeping fluid into the vac line. Not much, but it is, the old trans line internally was dry as a bone, the hose being semi clear, you can see if there's fluid in it.

Things I kick myself for not doing when I had it on the bench.. Actually I wanted to do it; had the parts and everything, but was soo excited for a sunny trans install day it slipped my mind.


I just have an errie feeling that its the goveneor sticking, and causing the erratic shift points. I hope I can swap it out with the trans in the car, but im thinking not.

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Just my MB's:
1990 420sel - Winter DD - 410,000km
1990 560sel - absolutely showroom mint - 360,000km!