The 722.3 transmission does have a governor that can be removed from the outside of the transmission - however I think you should

1) Listen to Larry - see post 5
2) Read this thread Help - stuck on road 722.3 no 3rd/4th gear it doesn't seem to be as easy you might think.

There's lots of stuff to do before you end up with the last option => pulling the governor out.

I'm sorry to do this to you as it is a lot of reading but here's the best place to start

DIY W123 Transmission Diagnose and Adjustment 722.xx OM 616-7 - Benzworld.org - Mercedes-Benz Discussion Forum

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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!