63/64 Cadillac Website

correct size of vacuum hose turbo hydramatic

I'm pretty sure anybody here knows the correct size of inner diameter of the rubber vacuum hose from the metal vacuum line to the vacuum modulator assembly? Mine is the original one, too old and does have several cracks now. Now the gear is not shifting anymore or let's say at too high rpm.

I don't have my car around me currently. So unfortunately I can't have a look by myself! :(

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Comment by Christian Doerk on November 26, 2014 at 9:51am: Thanks Jeff

I already have a new rubber line which is good for high and low temperatures, gas, oil etc. When I wrote the post, the car was stored away and I could not measure the size. The inner diameter of the rubber is 6 mm or 0,2362 inch.

The vacuum modulator is relatively new, so there should not be any problem. But thank you for the hint!

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