nix1981

Can anyone tell me what the difference is between the BB and SB auto (400) modulator vacuum line? I'd like to replace the line in my 69 SB and the only one I can find is a replacement from Paragon (4061) that's for a BB. No SB line to be had. I was thinking about just buying this one but I don't know how different they are. Any thoughts, help, or leads on where I might get one that's either new or one that's in good shape?

TimAT

The BB line might be a touch longer. Be easy to fab your own too. Piece of 3/16 brake tube and have at it. It's got a rubber connector on each end so exact is not required.

calwldlife

i thought the vac mods were different in what range they operate?
seen many modules that had fat hoses stepped down to smaller ones?

drop by a transmission shop and pick a brain.

nix1981

This tube seems to be a bit of a Unicorn.

TimAT

The modulators are pretty much the same. Some are adjustable- there's a screw slot inside the tube- about 2 turns either side from where the manufacturer set it- any more you risk tearing the diaphragm.
Past that, vacuum is vacuum. Short of installing a controlled leak in the line, it's sees vacuum and does it's job.

calwldlife

awh, that is right.
so much stuff in my head that lately it doesn't fit
together.

TimAT

Oh just wait- it gets better. I still remember the VIN of the first car I bought new- and my first driver's license number (it's longer than the VIN)
- talk about useless noise in there!!