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!

Comment by Jeff Kinzler on November 24, 2014 at 3:26am

Don't remember the size, but it was a standard auto part store item. 

While you are at it, it might not be a bad ideal to replace the vacuum modulator at the same time. Its an inexpensive part, but when it fails, you will get a massive cloud of blue smoke coming out of your engine, which if nothing else will give you a good scare. Fortunately, no serious damage happens, but your engine will suck in and burn transmission oil if and when this occurs. 

Why not just cut a piece of the rubber line off from behind the carburetor, and bring it to an auto parts store to match up?

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