The big brown truck of happiness delivered my new Mityvac today. Now starts the quest to find the root of my clunking sound during the 2>1 downshift.
So far I have:
1: Connected to Mityvac to blk line going to modualtor. With engine at idle pumped up to 17"hg it held for 5min. So I assume line to tranny is go to go.

2: Connected to fitting between Vacunm pump and brake booster. Started engine. Reading at Mityvac was 21-22"hg. So belive vacunm pump and those line ok.

Got dark on me so I quit for the night. Have read most of the tranny articles like Steve Brotherton's etc. My next step is to test IP control/bleeder valve, but a little confused on where to hook up the mityvac. Do I go to top direct to valve? Or connect to green orfice? Do I pump up mityvac and see if it holds vacunm? Start engine? Or is it suppose to procuce vacunm on its own and give reading?

Sorry for long post, just wanna learn.

Andy

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83 300D 169K (Mine)
86 F250 4X4 6.9 (Mine)
05 VW Passat TDI (Wife's)