Thank you all again for making this forum such a life saver.
Recently replaced the water pump and she runs cool and even again thanks to the knowledge shared here.

However...
I've noticed lately that my automatic transmission (79 300D) is shifting strangely, shifting later than usual and slipping(?) a bit in the final downshift when braking . The fluid level is OK so I began worrying that it was something major. After reading through several searched threads here and a couple of off site links I believe it to be a vacuum problem (the door locks have gotten very sluggish, too).

I am almost totally unfamiliar with the vacuum system (aside from basic knowledge of phsycis). I plan on keeping this car for as many miles as possible, so I've purchased a metal Mityvac kit (upon advice from the forum). I'm just not sure where to begin checking. Do I start at the vacuum pump and work back to the problem areas or start at the problem and work back to the pump? Any other things I should be looking at here?

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'79 300D "Jaeger"
'61 VW Baja "Frosch"
'92 Honda Shadow 600
'80 Honda 185 (cafe project)