From what I understand you need to look up the pressure in a TDM based on you transmission serial number. I saved this from another list.

> client suppor services for classic Mercedes-Benz
> owners. Specialists armed with technical data are
> on
> call between 9am and 5pm (EST) Monday thru Friday to
> field calls from owners on a toll-free
> line--1-866-622-5277. Inquires also may be sent via
> e-mail to classic-parts@mbusa.com." That was from
> Autoweek December 18th, 2000.
> All for your information!

a 722.303 transmission


If it's the original modulator pressure should be 2.9 bar at 50km/hr. If
it's the updated modulator the pressure should be 3.3 bar at 50km/hr.

Also make sure the vacuum control valve on your IP is adjusted properly and you don't have an intermittent leak from the vacuum switch over valves for the EGR on top of the valve cover.

Here is a link to a good article on adjusting these slush boxes.

http://www.mbz.org/articles/trans/diesel.html

Hope this helps

Bob D.
1971 220D
1983 300SD
1984 300SD