I have read quite a few good posts here about troubleshooting the vacuum system. I found a few bad rubber connectors and replaced them, which vastly improved my shifting from 2-3, but 1-2 is still abrupt, and I can feel a clunk coming back from 2-1. I put my Mityvac on the line going to the tranny and it does not hold vacuum. As recommended, I am going to measure what vacuum I am starting with coming off the vacuum pump. If I run a line into the cabin to my guage while I am driving, will I be able to use a length of vacuum hose from the auto parts store, or do I need to use a stiffer plastic line? For that matter, should I pull and use the line going down to the tranny for this purpose? It looks like it would probably be long enough.

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