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Mark Ugrich · 10-24-2018, 08:03 PM

You are partly correct. The tube was necked down to locate it to the fittings. This allowed for just a straight short piece of rubber vacuum line to seal the connection. If you look closely into the opening of the tube, you will most likely see a restriction on the end by the modulator. I would open up the ends of the metal line with a drill of appropriate size.It’s possible you may have to change the 1-2 shift valve spring in the valve body to get the trans to shift where you want it to.

10-24-2018, 08:03 PM	#29
Mark Ugrich Member Join Date: May 2011 Location: Auburndale,Florida Posts: 201 Likes: 20 Liked 57 Times in 32 Posts	Re: Turbo 400 experts please step in.... You are partly correct. The tube was necked down to locate it to the fittings. This allowed for just a straight short piece of rubber vacuum line to seal the connection. If you look closely into the opening of the tube, you will most likely see a restriction on the end by the modulator. I would open up the ends of the metal line with a drill of appropriate size.It’s possible you may have to change the 1-2 shift valve spring in the valve body to get the trans to shift where you want it to.